Section 8 HAP Contracts: Government Rent Mechanics, Renewal Options, and Revenue Modeling for Institutional Owners

Key Takeaways

What a HAP Contract Is

A Housing Assistance Payment contract is a legal agreement between the U.S. Department of Housing and Urban Development (HUD) and the owner of a multifamily property. The contract commits HUD to making monthly subsidy payments to the owner for each unit covered by the agreement. In return, the owner agrees to rent those units to income-eligible households, maintain the property to HUD's physical standards, and accept HUD-determined rents for the duration of the contract.

The HAP contract is the financial engine of the project-based Section 8 program. Unlike tenant-based Housing Choice Vouchers, where the subsidy follows the tenant from property to property, a project-based HAP contract ties the subsidy to specific units in a specific building. When a tenant moves out, the subsidy stays with the unit and the next income-eligible tenant receives the assistance. This distinction matters for underwriting because project-based assistance provides a predictable, unit-level revenue stream that does not depend on tenant retention. The owner's income is backstopped by a federal contract, not by the individual tenant's ability to pay.

The subsidy calculation is straightforward. HUD pays the difference between the contract rent (the total rent HUD has approved for the unit) and the tenant's contribution. The tenant's contribution is the total tenant payment, which under 24 CFR 5.628 is the highest of 30% of monthly adjusted income, 10% of monthly income, any designated welfare rent, or the minimum rent, which 24 CFR 5.630 sets at $25 for project-based Section 8. If the contract rent for a one-bedroom unit is $1,200 per month and the tenant's adjusted income produces a $360 monthly contribution, HUD pays $840 per month directly to the owner. The owner receives the full contract rent regardless of the tenant's income level, which is why HAP contract rents are the dominant revenue line in affordable multifamily pro formas.

The Congressional Research Service reported in December 2023 that the project-based Section 8 program includes over 17,500 properties comprising nearly 1.3 million assisted units. The HUD Office of Multifamily Housing administers the renewal process through a network of Contract Administrators (typically state housing finance agencies) who handle the day-to-day administration of HAP contracts on HUD's behalf.

HAP Contract Structure

Every HAP contract specifies four elements that determine the property's revenue structure: the contract rent for each unit type, the number of assisted units, the term of the contract, and the regulatory obligations attached to the subsidy.

Contract Rent

Contract rent is the per-unit monthly amount that HUD has approved for each bedroom size. It is not market rent, although the two may converge or diverge depending on the property's location and the local rental market. In some markets, particularly rural areas and legacy properties that received deep subsidies in the 1970s and 1980s, contract rents exceed comparable market rents. In other markets, particularly strong urban submarkets where market rents have grown faster than HUD adjustments, contract rents sit below what the units could command on the open market. This gap between contract rent and achievable market rent is the central variable in the opt-out decision.

Contract rents are not static. They adjust annually through the Operating Cost Adjustment Factor (OCAF) and periodically through rent comparability studies. The adjustment mechanics are detailed below in their own sections, but the key principle is that contract rents track a cost-based inflation index rather than market dynamics. When operating costs rise, contract rents rise by a corresponding factor. When market rents surge due to demand, contract rents do not automatically follow.

Number of Assisted Units

A HAP contract may cover all units in a property or only a portion. A 200-unit apartment complex might have a HAP contract covering 150 units, with the remaining 50 units rented at market rates. The assisted unit count is fixed in the contract and can only change through a formal contract modification approved by HUD. For underwriting purposes, the assisted unit count defines the contracted revenue base: those units will produce contract rent income as long as the contract is in effect and the units are occupied by eligible tenants.

Vacancy in assisted units does create revenue loss, but the dynamics differ from market-rate vacancy. Contracts that carry the vacancy-payment clause in 24 CFR 880.611 pay 80% of the contract rent for the first 60 days of vacancy, provided the owner notified the Contract Administrator promptly, did not cause the vacancy, and is taking all feasible actions to fill the unit. After 60 days, the owner may apply for further payments limited to the debt service attributable to the vacant unit, for up to 12 more months, but only if the project is not covering its expenses. Check the vacancy clause in the specific HAP contract before modeling it. Where waiting lists are long, assisted vacancy runs below market-rate benchmarks, but the waiting list for the subject property is the evidence to underwrite, not a national rule of thumb.

Contract Term

HUD actively entered into new HAP contracts from the program's creation in 1974 through the early 1980s, and the Congressional Research Service notes that PBRA contracts typically have 20-year terms. As those original contracts began expiring in the mid-1990s, Congress enacted MAHRA in 1997 to establish the framework for contract renewals. Under MAHRA, renewal terms range from 1 year to 20 years depending on the option and the owner's election, with a five-year minimum for Mark-Up-to-Market contracts. The term choice involves a tradeoff between revenue certainty (longer terms lock in government-backed income) and operational flexibility (shorter terms preserve the option to convert to market-rate operations sooner).

Regulatory Obligations

Accepting a HAP contract imposes regulatory requirements that market-rate properties do not face. The owner must maintain the property to HUD's physical inspection standards (the National Standards for the Physical Inspection of Real Estate, or NSPIRE, to which HUD's Multifamily Housing programs transitioned on October 1, 2023, with inspections administered by HUD's Real Estate Assessment Center), submit annual financial statements audited under HUD guidelines, comply with income and rent limit requirements for assisted tenants, follow HUD's tenant selection and grievance procedures, and submit to Management and Occupancy Reviews (MORs) conducted by the Contract Administrator. These compliance costs are real and should be reflected in the pro forma as a separate line item. This article uses $200 to $400 per unit per year as an illustrative assumption; replace it with the operator's own cost history for the portfolio.

The Six HUD Renewal Options

When a HAP contract approaches expiration, the owner must decide whether to renew, and if so, under which option. HUD's Section 8 Renewal Policy Guidebook defines six owner options (five renewal paths plus the opt-out), and the owner may choose only among the options for which the project is eligible at the expiration date. HUD's Section 8 Contract Renewal Options page summarizes the term and rent rules for each. The National Center for Housing Management (NCHM) provides a practitioner-oriented overview of the same six options. The following section details each option from the perspective of an institutional owner or underwriter modeling renewal outcomes.

Option 1: Mark-Up-to-Market

Option 1 is available when aggregate contract rents under the expiring contract are below comparable market rents, as shown by an owner-commissioned rent comparability study (RCS). At renewal, rents are reset to comparable market rents. Under Option 1-A, the entitlement version authorized by MAHRA section 524(a)(4)(A), the renewal rents equal the lesser of comparable market rents or 150% of the Fair Market Rent (FMR). Projects that meet the discretionary criteria of Option 1-B under section 524(a)(4)(C) can be marked up to full comparable market rents. The term is between 5 and 20 years; MAHRA requires a minimum five-year term for a mark-up-to-market contract. Between resets, rents adjust annually by the OCAF, and no budget-based rent increases are permitted under a Mark-Up-to-Market contract.

Option 1 is the most favorable renewal option for owners of properties in strong rental markets where contract rents have lagged market growth. Eligibility is condition-based. The Guidebook requires a most recent Management and Occupancy Review (MOR) rating of "Satisfactory" or better, a physical inspection score of 60 or above with no uncorrected exigent health and safety violations, and closed (or HUD-approved corrective plans for) financial findings. Option 1-A also requires comparable market rents at or above 100% of FMR, no low- and moderate-income use restriction the owner cannot remove unilaterally (for example, Low-Income Housing Tax Credits), and an eligible ownership type. Properties with significant deferred maintenance may not score high enough to qualify until repairs are completed.

Option 2: Mark-Up-to-Budget (Rents At or Below Market)

Option 2 renews contracts whose aggregate rents are at or below comparable market rents, with rents adjusted by the OCAF or, at the owner's request and with HUD approval, by a budget. Budget-based rents may not exceed comparable market rents. An owner whose rents exceed market but whose project is exempt from Mark-to-Market restructuring can also use Option 2 by cutting rents to market before renewal. The term is between 1 and 20 years.

Option 2 is the standard path for properties that do not qualify for Mark-Up-to-Market, including many tax-credit properties whose use restrictions exclude them from Option 1-A, and for owners who want budget-based increases to fund operating needs. For an Option 2 contract longer than five years, the owner must submit a new RCS at each five-year interval, and rents are reset to market in either direction.

Option 3: Referral to the Office of Recapitalization (Mark-to-Market)

Option 3 applies when contract rents exceed comparable market rents and the project has an FHA-insured or HUD-held mortgage. The contract is referred to HUD's Office of Recapitalization (Recap), formerly the Office of Affordable Housing Preservation. At renewal, rents are reduced to comparable market levels. If the property cannot carry its existing debt at market rents, the mortgage can be restructured into a primary mortgage sized to market-rent cash flow plus subordinate debt, and use restrictions remain in place while the subordinate debt is outstanding. The term is 20 years.

For institutional owners, Option 3 is a rent reduction, not a revenue optimization strategy. It also has a statutory deadline. MAHRA section 579 repeals the Mark-to-Market program (Subtitle A, other than section 524) effective October 1, 2027, except for projects with binding commitments entered into before that date. An owner with above-market rents and FHA-insured debt whose contract expires near that date should confirm with HUD whether restructuring will still be available.

Option 4: Exception Projects

Option 4 renews contracts for "exception" projects under MAHRA section 524(b)(1): projects that are exempt from debt restructuring under section 514(h) or are not an "eligible multifamily housing project" as MAHRA defines it. In practice, these are often properties without FHA-insured debt, such as conventionally financed or tax-credit-financed projects. At renewal, rents are set at the lesser of the current rents adjusted by the OCAF or a budget-based rent level, and HUD caps the budget path at comparable market rents as determined by a rent comparability study. Exception projects are generally exempt from having to conduct a rent comparability study and lower rents to comparable market rents, although owners of projects with certain HUD-held or FHA-insured mortgages must obtain one when renewing under this option. The term is between 1 and 20 years.

Option 5: Demonstration and Preservation Projects

Option 5 covers projects whose existing agreements dictate the renewal path: Portfolio Reengineering Demonstration projects with a Demo Program Use Agreement, and preservation projects under Title II (the Emergency Low Income Housing Preservation Act of 1987, ELIHPA) or Title VI (the Low-Income Housing Preservation and Resident Homeownership Act of 1990, LIHPRHA). Rents and annual adjustments depend on the project's HAP contract, Use Agreement and, where applicable, Plan of Action, and the renewal term cannot run past the end of the Use Agreement.

For investors evaluating an acquisition, an Option 5 property carries a recorded use agreement that binds subsequent owners and limits exit options. The residual value assumption should reflect affordable-only buyers for the remaining life of that agreement.

Option 6: Opt-Out

Option 6 is the decision not to renew. The owner must give tenants and HUD (or the Contract Administrator) one year's notice before the contract expires, and eligible tenants receive enhanced vouchers under Section 8(t) of the Housing Act. The opt-out is not available to an owner whose Use Agreement requires renewal, and HUD notes that state and local law may further restrict an owner's ability to opt out. The opt-out economics are covered in their own section below.

OCAF Rent Adjustment Mechanics

The Operating Cost Adjustment Factor is HUD's annual adjustment factor for project-based Section 8 contract rents renewed under MAHRA. HUD publishes the factors in a Federal Register notice, usually in the fall, and they apply to contract anniversaries on or after February 11 of the following year. Timing varies: the 2025 factors were published December 11, 2024, and the 2026 factors on February 3, 2026. The OCAF reflects changes in the cost of operating multifamily rental housing. It is not a market rent index. This distinction is critical for revenue forecasting: OCAF-adjusted rents track inflation in operating expenses, not the supply-and-demand dynamics that drive market rents.

How the OCAF Is Calculated

HUD calculates each OCAF as the sum of weighted changes across nine operating cost categories: electricity, employee benefits, employee wages, fuel oil, goods, supplies and equipment, insurance, natural gas, property taxes, and water, sewer and trash. The weights come from three years of audited financial statements of projects covered by OCAFs, and the inputs come from sources such as the Bureau of Labor Statistics Employment Cost Index and Consumer Price Index series, Energy Information Administration price data, Census tax receipts, and audited financial statement data for insurance. Market rent is not one of the components. By statute, an OCAF cannot produce a negative adjustment, and HUD floors any state's calculated factor at zero.

The weights, and therefore the factors, are calculated by state, which is the lowest level of geography with enough projects for statistical analysis. State dispersion is wide. In 2026 the factors ranged from 3.3% (Maine) to 9.8% (Louisiana), with the Virgin Islands at 12.3%, against a United States figure of 5.1%. The United States figures in recent notices are shown below.

Application to Contract Rents

OCAF adjustments are applied annually on the anniversary date of the HAP contract, using the factor for the state where the project is located. The factor applies only to the portion of the rent attributable to operating expenses, not to the portion that pays debt service. The debt service component is reported on the OCAF Rent Adjustment Worksheet (Form HUD-9625). For a one-bedroom unit with a current contract rent of $1,200/month and the 2025 U.S. OCAF of 4.8%:

If no debt service is attributed to the rent: new contract rent = $1,200 + (4.8% x $1,200) = $1,200 + $57.60 = $1,258/month (rounded).

If $300 of the rent is attributed to debt service: new contract rent = $1,200 + (4.8% x $900) = $1,200 + $43.20 = $1,243/month (rounded).

The OCAF adjustment is formula-driven, but it is not hands-off. For projects in the Auto OCAF process, the Contract Administrator sends the owner an Auto OCAF letter (Form HUD-9626 or HUD-9627) with the recalculated rent schedule, and the owner must sign and return it or, where the contract allows, request a budget-based adjustment instead. Owners outside Auto OCAF submit Form HUD-9625 at least 120 days but no earlier than 180 days before the anniversary date. Once processed, the adjustment gives the property annual rent growth tied to cost inflation, without the market risk and negotiation costs of market-rate rent increases.

However, the OCAF is a blunt instrument. It applies a uniform percentage increase across all units in a property, regardless of unit condition, recent capital improvements, or submarket-specific rent dynamics. A property that has invested heavily in unit renovations and could command a premium in the market receives the same OCAF adjustment as a property that has not invested. This is why the rent comparability study, required at each five-year interval of a multi-year Option 1 or Option 2 contract, serves as a reset mechanism that realigns contract rents with market conditions in either direction.

OCAF Limitations

The OCAF has three structural limitations that practitioners should understand. First, it is backward-looking. The 2026 factors, for example, compare cost data from mid-2025 with mid-2024 (wages and benefits from the second quarter, goods and supplies from July) and apply to anniversaries from February 11, 2026 onward, so contract rents trail current operating costs. During periods of rapid cost inflation, this lag compresses operating margins because expenses are rising faster than contract rents.

Second, the OCAF does not capture capital expenditure needs. It adjusts rents for operating cost inflation but does not account for the periodic capital investments (roof replacements, elevator modernization, mechanical system overhauls) that every multifamily property requires. Owners must fund capital expenditures from reserves, refinancing proceeds, or operating cash flow, not from OCAF adjustments.

Third, the OCAF does not reflect market rent changes. Take an illustrative market where rents grow 6% a year while contract rents grow at a 4.9% OCAF. After 10 years, market rents end about 11% above OCAF-adjusted rents (1.06^10 / 1.049^10 = 1.110), which means contract rents sit about 10% below market. That gap is an opportunity cost for owners in strong rental markets and the trigger for an opt-out analysis, though for Option 1 and Option 2 contracts the five-year RCS resets close it periodically.

Rent Comparability Studies

A rent comparability study (RCS) is an independent appraisal that establishes the market-comparable rent for each unit type in a Section 8 property. Under Option 1 renewals, the RCS sets the marked-up rents at renewal. For Option 1 and Option 2 contracts longer than five years, the owner must submit a new RCS at the end of each five-year cycle, and HUD's renewal page states that the study is used to set rents on the 5th, 10th, and 15th anniversaries. The RCS is the mechanism that prevents the gap between OCAF-adjusted rents and market rents from growing indefinitely in either direction.

RCS Methodology

The RCS must be prepared by a Certified General Appraiser, licensed and in good standing in the state where the project is located, with no financial interest in the project and no employment or close relationship with the owner or management agent. The appraiser selects comparable properties, adjusts for differences in unit size, age, condition, amenities, services, and location, and arrives at an indicated market rent for each unit type. The methodology follows Chapter 9 of the Guidebook, which the National Low Income Housing Coalition (NLIHC) summarized when HUD updated it in 2023.

Chapter 9 requires a good-faith effort to find comparable units from five properties for each primary unit type. The comparables must be in the same market area, occupied by tenants without tenant-based assistance, similar in location, structure, age and amenities, and not rent-restricted or rent-controlled by any public program (which excludes, for example, Low-Income Housing Tax Credit and HOME units). Chapter 9 sets no fixed mileage radius; if five qualifying comparables cannot be found, the appraiser may use alternative strategies, including comparables from outside the market area, and may use fewer than five only if no unit type has fewer than three. Adjustments for differences between the subject property and the comparables must be documented and supported by market data.

The RCS produces a "comparable market rent" for each unit type, and the five-year reset moves contract rents to that level in both directions. The Guidebook instructs that if rents are above market, the Contract Administrator reduces them to the comparable market rent, and if they are below market, it increases them to comparable market rents. The OCAF-adjusted RCS also serves as the market cap on any budget-based request in the intervening years. Model the five-year reset as a two-sided adjustment: an RCS can cut contract rents where market rents have fallen behind the OCAF path.

Common RCS Disputes

The RCS process is adversarial. The owner wants the highest possible comparable market rent. HUD (through the Contract Administrator) wants to ensure that contract rents do not exceed true market levels. Common disputes include the following.

Comparable selection. Owners often argue that the appraiser selected inferior comparables that depress the indicated market rent. They may identify higher-rent properties that they believe are more truly comparable. HUD may reject those comparables as not representative of the subject property's submarket or condition. The appraiser must document the rationale for including or excluding each potential comparable.

Condition adjustments. If the subject property is in better condition than the comparables (due to recent capital improvements), the owner will argue for a positive condition adjustment that increases the indicated rent. HUD may scrutinize the magnitude of the adjustment and require documentation of the improvements. Conversely, if the subject property is in worse condition, HUD may argue for a negative adjustment that the owner disputes.

Amenity adjustments. Properties with in-unit washers and dryers, covered parking, fitness centers, or other amenities command rent premiums in the market. The RCS must adjust for amenity differences between the subject and the comparables. Owners with recently upgraded amenities want full credit for those improvements. HUD's review guidance requires market evidence for larger adjustments; for special features, for example, any single adjustment above $10 or 2% of the comparable's unadjusted rent, whichever is larger, must be supported in the report.

Non-shelter services. Some Section 8 properties provide services (service coordination, resident programming, meals for elderly residents) that market-rate comparables may or may not offer. Chapter 9 requires the appraiser to identify non-shelter services at the subject and at each comparable and to value the differences: the value of availability where a comparable offers a service for a fee or only sporadically, and the full rent differential where the service is included in the rent. Total net adjustments for these line items above $50 or 5% of the comparable's unadjusted rent, whichever is larger, trigger a second review.

The Opt-Out Decision Framework

An owner may choose not to renew the HAP contract and instead convert the property to market-rate operations. This is the "opt-out" decision, Option 6 in HUD's framework. The opt-out is most commonly considered when market rents significantly exceed HAP contract rents, meaning the owner is forgoing revenue by maintaining the Section 8 contract. However, the opt-out decision is more complex than a simple comparison of contract rents and market rents, and an owner eligible for Option 1 should compare market rents with the marked-up Option 1 rents, not with the expiring contract rents.

Notice Requirements

An owner who decides not to renew must provide written notice to the tenants and to HUD or the Contract Administrator at least one year before the HAP contract expiration date, as 42 U.S.C. 1437f(c)(8) requires. The notice must state the owner's intent not to renew and confirm that the owner will honor eligible tenants' right to remain with enhanced vouchers. If the notice is late, the owner may not evict the tenants or increase their rent payment until proper notice has been given and a full year has elapsed. HUD may allow the owner to renew the terminating contract for long enough to complete the year of notice, and the Guidebook directs the Contract Administrator to offer a short-term contract at current rents for that purpose. Owners must also comply with any state or local notice rules, which HUD notes may further restrict opt-outs.

Enhanced Vouchers Under Section 8(t)

When an owner opts out, eligible tenants in assisted units receive enhanced vouchers under Section 8(t) of the Housing Act. Enhanced vouchers differ from standard Housing Choice Vouchers in a critical way: while the family elects to stay in the same project, the payment standard equals the rent for the unit (as that rent may increase over time), subject to the rent reasonableness test, rather than the area's standard voucher payment level. The family must pay no less than the amount it was paying on the date of the opt-out. If the family moves out of the project, the enhanced payment standard ends and the regular voucher rules apply. This means tenants can remain in their current units after the HAP contract expires, with the voucher covering the difference between a reasonable market rent and the family's contribution.

For the owner, enhanced vouchers have important implications. After the opt-out, the owner can raise rents to reasonable market levels, but many tenants will remain in place using enhanced vouchers. The owner receives the market rent, but the payment comes from two sources: the tenant's contribution and the voucher subsidy. The administrative burden of processing voucher payments differs from HAP payments. HAP payments come monthly from the Contract Administrator. Voucher payments come from the local housing authority and require annual income recertification, housing authority inspections under the voucher program's physical standards (Housing Quality Standards until the housing authority moves to NSPIRE, with the compliance date extended through January 31, 2027), and compliance with the voucher program's lease requirements.

The practical impact is that an opt-out does not immediately convert a Section 8 property to a fully market-rate operation. Many tenants remain with vouchers, and the property continues to serve a predominantly low-income population for years after the opt-out. Market-rate tenants replace voucher holders only as units turn over. This article uses a three-year transition to stabilized market occupancy as an illustrative assumption; the actual pace depends on the tenant population and should be underwritten from the property's own turnover history.

Financial Analysis Framework

The opt-out decision should be evaluated using a discounted cash flow analysis that compares two scenarios on the same basis, with the same hold period, discount rate, and reversion method:

Scenario A: Renew the HAP contract (Option 1 or Option 2). Revenue is the contract rent (with OCAF adjustments and five-year RCS resets in either direction) multiplied by the number of assisted units. Assisted vacancy is modeled low (this article uses 2% to 3% as an illustrative range) where the waiting list supports it. Operating expenses include a separate Section 8 compliance line item. Capital expenditures follow the property's own capital needs assessment.

Scenario B: Opt out and convert to market rate. Revenue transitions from contract rent to market rent over a multi-year transition (three years in this article's illustrative example) as voucher holders vacate and market-rate tenants lease up. Transition vacancy runs well above stabilized levels while units are renovated and re-leased. Capital expenditures include the unit renovations required to attract market-rate tenants, priced from a contractor estimate for the specific property. Market-rate operating expenses replace Section 8 compliance costs but may include higher marketing and turnover costs.

The break-even analysis identifies how far achievable market rents must exceed the renewal rents to justify the opt-out. The answer depends on the renovation budget, the length and depth of the transition vacancy, the cap rates applied to each scenario, and the owner's discount rate, so it should be computed for the property rather than borrowed from a rule of thumb. Where the property qualifies for Option 1, the comparison is against market-level renewal rents, which makes the opt-out much harder to justify than a comparison against the expiring contract rents suggests. The worked example below computes the break-even for one illustrative property.

RAD-Converted Assets and Section 18

The Rental Assistance Demonstration (RAD), authorized by Congress in 2012, is often discussed alongside Section 8 renewals, but it is not a conversion path for an owner that already holds a regular project-based HAP contract. HUD describes RAD as a tool to preserve housing supported under the public housing, Section 8 Moderate Rehabilitation, Moderate Rehabilitation Single Room Occupancy, and Section 202 and Section 811 rental assistance contract programs, and its public housing RAD page adds the legacy Rent Supplement and Rental Assistance Payment programs. Those properties convert their assistance to long-term project-based Section 8 contracts, which the RAD statute allows to take the form of project-based rental assistance (PBRA) or project-based vouchers under section 8(o)(13) (PBV). An owner of an existing PBRA property renews under MAHRA. For institutional investors, RAD matters mainly when acquiring or financing a RAD-converted asset.

What an Acquirer of a RAD-Converted Asset Is Buying

The RAD statute, set out in the notes to 42 U.S.C. 1437f, shapes the revenue and exit profile of a converted property. Contracts for converted public housing "may allow for rental adjustments only by an operating cost factor established by the Secretary," and contracts converted from the legacy programs have a term of no less than 20 years "with rent adjustments only by an operating cost factor." In other words, RAD contract rents move with the OCAF, not with HUD's separate Annual Adjustment Factor.

For converted public housing, the statute also requires "long-term renewable use and affordability restrictions" and provides that, at the expiration of the initial contract and each renewal contract, HUD offer and the owner accept renewal. For contracts converted from the legacy programs, the statute provides that they are eligible for renewal under MAHRA section 524 but does not add that offer-and-accept clause. HUD's RAD implementation notice (Revision 4) follows the same split. A converted public housing project carries a mandatory contract renewal and a RAD Use Agreement that renews with the HAP contract, so its affordability is effectively perpetual. For Section 202 PRAC conversions, the owner agrees to accept each renewal offer during the term of the recorded Elderly Housing Use Agreement. For Moderate Rehabilitation, Single Room Occupancy, Rent Supplement and Rental Assistance Payment conversions, the notice provides only that the owner is eligible to renew under MAHRA section 524 after the initial term. For converted public housing, HUD must also require ownership or control by a public or nonprofit entity. Ownership may be transferred to a for-profit entity to facilitate tax credits only if the housing authority or a nonprofit preserves an interest in the property in a manner HUD approves. HUD presents the long-term contract as what allows housing authorities and owners to leverage private debt and equity for rehabilitation.

Section 18

Section 18 of the Housing Act (42 U.S.C. 1437p) governs the demolition and disposition of public housing and is triggered by an application from a public housing agency. It is not a pathway for privately owned PBRA properties, and the RAD statute provides that Section 18 does not apply to a property converting all or substantially all of its units under RAD. Institutional investors encounter Section 18 when partnering with a housing authority on a public housing redevelopment, not when renewing a private HAP contract.

Impact on Revenue Modeling

For pro forma modeling purposes, the key differences between a MAHRA-renewed HAP contract and a RAD-converted contract are the following:

The practical question for a PBRA owner is therefore not whether to convert under RAD but which MAHRA option to choose, and whether to opt out. The practical question for an acquirer of a RAD-converted asset is how to value an OCAF-indexed affordable income stream, effectively perpetual for converted public housing, with a constrained buyer pool at exit.

Pro Forma Modeling Conventions

Modeling government-assisted revenue in a multifamily pro forma requires adapting the standard market-rate framework to reflect the regulatory mechanics of HAP contracts. The following conventions apply when underwriting PBRA properties.

Revenue Line Structure

The revenue section of a Section 8 pro forma separates assisted revenue from market revenue. Assisted revenue equals the contract rent (by unit type and bedroom count) multiplied by the number of assisted units, multiplied by 12 months, less vacancy and collection loss. Market revenue (if the property has non-assisted units) is modeled separately using standard market-rate conventions. Total gross potential revenue is the sum of assisted and market components plus other income (laundry, parking, application fees, late fees).

This article uses an assisted-unit vacancy assumption of 2% to 3% as an illustrative range, below typical market-rate assumptions, reflecting waiting-list demand and, where the contract includes it, the 80%-of-contract-rent vacancy payment for the first 60 days. Collection loss on assisted units is low because HUD's share of the rent is paid directly to the owner and the tenant's share is limited to the total tenant payment. Model bad debt only on the tenant-paid portion, using the property's own collection history.

Revenue Growth Assumptions

Revenue growth on assisted units is driven by the OCAF, not by market rent growth. The pro forma should use a separate growth rate for assisted revenue (the OCAF assumption) and market revenue (the market rent growth assumption). Blending the two into a single growth rate produces misleading results because the OCAF and market rent growth rates are structurally different.

For a 20-year Option 1 renewal, the revenue growth model includes three components:

1. Annual OCAF adjustment: Applied each year to the portion of contract rent not attributed to debt service. Use the property's state OCAF; as a national reference, the trailing five-year U.S. average entering 2026 is about 4.9%.
2. RCS reset at years 5, 10, and 15: At each reset, contract rents move to the comparable market level determined by the new RCS. Model the reset as a two-sided adjustment equal to the gap between OCAF-adjusted rents and market rents at the reset date: an increase if market rents have outrun the OCAF, a cut if they have lagged it.
3. Market rent growth on non-assisted units: Applied at the submarket's market growth rate, independent of OCAF, taken from the same market forecast used for the property's comparables.

Expense Considerations

Section 8 properties have operating expense profiles that differ from market-rate properties in several ways. Compliance costs (this article uses $200 to $400 per unit per year as an illustrative assumption) cover physical inspection preparation, MOR compliance, annual audited financial statements, and tenant certification processing. Management fees and turnover costs also differ from market-rate norms: the administrative burden of certifications argues for a higher fee, while longer tenancies in assisted housing reduce turnover cost. Use the operator's actual fee agreement and the property's turnover history rather than market-rate defaults.

Replacement reserve deposits on HUD-insured and HUD-assisted properties are typically fixed by the property's regulatory agreement or loan documents and held in a restricted account, with withdrawals subject to approval. Model them as a fixed line item rather than a discretionary capital allowance. The worked example below uses $300 per unit per year as an illustrative input.

Debt and Valuation

Section 8 properties are valued differently from market-rate properties due to the nature of the government income stream. Buyers generally price stabilized Section 8 properties with long remaining contract terms at lower cap rates than comparable market-rate properties, reflecting lower vacancy risk, the federally funded income stream, and predictable OCAF-based revenue growth. The size of that spread varies by market and over time; take it from recent comparable sales rather than a fixed rule. The worked example below uses 5.25% for the renewal and 5.75% for the market-rate conversion as illustrative assumptions.

However, cap rate compression depends on contract term remaining. Properties with little time left on the HAP contract carry renewal uncertainty. The buyer does not know whether the next owner will renew or opt out, which renewal option will be selected, or what the RCS will produce. Properties with long remaining terms carry the least of that uncertainty, although multi-year HAP contracts are funded one year at a time, subject to appropriations.

Worked Example: 100-Unit Section 8 Renewal

Consider a 100-unit garden-style apartment complex with a project-based Section 8 HAP contract covering all 100 units. The contract is approaching expiration and the owner must decide between renewing under Option 1 (Mark-Up-to-Market) for a 20-year term and opting out. All inputs below are illustrative assumptions, not market data.

Property Profile

The example assumes the property has a satisfactory MOR, that comparable market rents are above 100% of FMR and below 150% of FMR (so the Option 1-A cap does not bind), and that no debt service is attributed to the contract rents, so the OCAF applies to the full rent. The 3.5% state OCAF sits within the 2026 state range of 3.3% to 9.8% and below the 4.9% national trailing average; it is set equal to market rent growth so that the comparison isolates the opt-out decision.

Scenario A: Option 1 Renewal (Mark-Up-to-Market)

The rent comparability study establishes market-comparable rents at $1,380/mo (1-BR), $1,680/mo (2-BR), and $1,920/mo (3-BR). These are slightly below the owner's own market rent estimates due to condition adjustments applied by the appraiser (the subject property's finishes are dated compared to recently renovated comparables).

Gross potential revenue at the reset rents:

• 40 one-bedroom units x $1,380/mo x 12 = $662,400
• 40 two-bedroom units x $1,680/mo x 12 = $806,400
• 20 three-bedroom units x $1,920/mo x 12 = $460,800
• Total GPR: $1,929,600

Compare to the pre-renewal GPR at current contract rents:

• 40 x $1,100 x 12 + 40 x $1,350 x 12 + 20 x $1,550 x 12 = $528,000 + $648,000 + $372,000 = $1,548,000

The Option 1 renewal produces a Year 1 rent increase of $381,600 (24.7% increase). With a 3% vacancy assumption, effective gross income in Year 1 of the renewal is $1,871,712. Operating expenses of $620,000 ($6,200 x 100 units) plus reserves of $30,000 ($300 x 100 units) yield net operating income of $1,221,712. At a 5.25% cap rate, the direct-capitalization value is $23,271,000. For the renewal decision, both scenarios are valued on the same five-year discounted cash flow basis below.

Discounted at 8%, the five years of NOI have a present value of about $5,204,000. The reversion at the end of Year 5 is Year 5 NOI capitalized at 5.25%: $1,401,942 / 0.0525 = about $26,704,000, with a present value of about $18,174,000. The Option 1 renewal is worth about $23,378,000 on this basis. Because contract rents and the unrenovated market comparables both grow 3.5% a year in this example, the RCS reset at the fifth anniversary (which falls after Year 5) would leave rents roughly unchanged, so it is not modeled.

Scenario B: Opt Out and Convert to Market Rate

The owner believes achievable market rents after renovation are $1,400/mo (1-BR), $1,700/mo (2-BR), and $1,950/mo (3-BR), for a Year 1 GPR of $1,956,000 (40 x $1,400 x 12 + 40 x $1,700 x 12 + 20 x $1,950 x 12 = $672,000 + $816,000 + $468,000). The conversion requires unit renovations at an average cost of $22,000 per unit ($2,200,000 total, spent at the start), and the transition to market-rate tenants is assumed to take three years as enhanced voucher holders gradually vacate.

In Year 1, 80 units remain occupied by voucher holders (paying market rent through enhanced vouchers) and 20 units are vacant or being renovated, so occupancy is 80% and effective gross income is $1,956,000 x 80% = $1,564,800. Operating expenses and reserves during the transition, including higher marketing and turnover costs, total $700,000, so Year 1 NOI is $864,800, well below the Option 1 renewal NOI. Occupancy then rises to 85% and 90% before stabilizing at 95% in Year 4.

Discounted at 8%, the five years of NOI have a present value of about $4,405,000. The reversion at the end of Year 5 is Year 5 NOI capitalized at a 5.75% market-rate cap rate: $1,329,061 / 0.0575 = about $23,114,000, with a present value of about $15,731,000. Net of the $2,200,000 renovation, the opt-out is worth about $17,936,000.

Decision

On a consistent basis, the Option 1 renewal (about $23,378,000) beats the opt-out (about $17,936,000) by about $5,442,000. The opt-out loses even before renovation capital: without the $2,200,000 spend, it would be worth about $20,136,000. The reason is visible in the rent comparison. The owner's market rents ($1,956,000 GPR) are 26.4% above the expiring contract rents ($1,548,000), but only 1.4% above the Option 1 marked-up rents ($1,929,600). Because Option 1 already captures most of the market rent, the opt-out trades a small rent premium for transition vacancy, renovation capital, a higher cap rate, and the loss of the government-funded income stream.

Under this example's other assumptions, the opt-out breaks even only if achievable market rents are about 17% higher than the owner's estimate in every year. That would put market rents about 18% above the Option 1 rents and about 47% above the expiring contract rents. The break-even moves with the renovation budget, the transition schedule, and the two cap rates, so it should be recomputed for each property rather than generalized.

Common Mistakes Practitioners Make

1. Using market rent growth rates for OCAF-adjusted revenue. The OCAF tracks operating cost inflation, not market rent dynamics. A pro forma that applies a market rent growth rate to assisted revenue will misstate income whenever the two diverge, and it hides the risk of OCAF-market divergence. Model assisted and market revenue separately, each with its own growth assumption.

2. Ignoring the RCS reset mechanism. A 20-year Option 1 renewal is not 20 years of OCAF-only growth. The RCS resets at years 5, 10, and 15 can produce significant rent changes that reshape the cash flow trajectory, and they work in both directions. Models that project a smooth OCAF curve without resets understate revenue in markets where rents outrun the OCAF and overstate it where rents lag.

3. Overestimating opt-out upside. The opt-out analysis requires realistic assumptions about renovation costs, transition vacancy, enhanced voucher administration, and market rent achievability. Practitioners who model a seamless conversion from contract rents to market rents in Year 1 ignore the multi-year transition (three years in this article's illustrative example), the capital investment required, and the reality that many tenants will remain with enhanced vouchers for years after the opt-out. They also often compare market rents with the expiring contract rents rather than with the Option 1 rents the owner could have had.

4. Neglecting contract term impact on valuation. Cap rate compression on Section 8 properties is a function of contract term remaining. A property with 3 years left on its HAP contract does not trade at the same cap rate as one with 18 years remaining. Applying a single cap rate across properties with different contract terms produces unreliable valuations.

5. Treating a RAD-converted asset like a MAHRA-renewed one. A RAD contract's rents adjust only by an operating cost factor. For converted public housing, the statute requires HUD to offer and the owner to accept renewal at every expiration, a RAD Use Agreement renews with the contract, and public or nonprofit ownership or control is required, so there is no opt-out exit and the residual value should be modeled on an affordable-only basis. The owner of a Section 202 PRAC conversion agrees to accept renewals during the term of its Elderly Housing Use Agreement, while Moderate Rehabilitation, Rent Supplement and Rental Assistance Payment conversions are eligible to renew under MAHRA section 524. Read the conversion documents and confirm the ownership structure before underwriting a for-profit position.

6. Overlooking compliance costs in operating expenses. Section 8 compliance administration (this article uses $200 to $400 per unit per year as an illustrative assumption) covers inspection preparation, MOR compliance, tenant certification, audited financial statements, and Contract Administrator reporting. At the worked example's Option 1 rents ($18,717 of effective gross income per unit), that range equals roughly 1% to 2% of effective gross income, which a pro forma built on market-rate expense ratios will miss.

Model It in Apers

Related Articles

• Operating Cash Flow Projection: Drivers and Assumptions. How to build the rent growth, vacancy, and expense assumptions that drive the pro forma, the framework that Section 8 modeling extends with separate assisted and market revenue lines.
• LIHTC 101: How the Program Works. The tax credit equity layer that often sits alongside Section 8 HAP contracts in affordable housing capital stacks, and how 4% and 9% credits differ.
• Market-Rate vs Affordable Multifamily: Underwriting Differences. How regulated and contract rents change the underwriting relative to a market-rate deal, including how HAP-supported income is treated.
• Multifamily Underwriting Fundamentals: The Rent Roll Reading Exercise. The foundational underwriting methodology for multifamily properties, including the loss-to-lease concept that applies when comparing contract rents to market rents in Section 8 properties.
• Cap Rate Decomposition: Risk-Free Rate, Risk Premium, and Growth. How cap rate compression on Section 8 properties reflects the lower risk profile of government-backed income streams and how to decompose the spread between market-rate and assisted cap rates.
• Use Case: Tax Credit Underwriting. How Apers underwrites affordable housing deals, where tax credit equity and rent-restricted revenue meet.

Sources

• U.S. Department of Housing and Urban Development,"Section 8 Renewal Policy Guidebook"(March 2023). Chapters 2 through 9 and 11: owner options, contract terms, OCAF processing, Mark-Up-to-Market eligibility, opt-outs, and rent comparability studies.
• U.S. Department of Housing and Urban Development,"Section 8 Contract Renewal Options".
• U.S. Department of Housing and Urban Development,"Notice of Certain Operating Cost Adjustment Factors for 2026", Federal Register (February 3, 2026), FR Doc. 2026-02201. Earlier annual OCAF notices: FR Docs. 2019-25389, 2020-26192, 2021-21511, 2022-24845, 2023-26331, and 2024-29016.
• 42 U.S.C. 1437f, including subsections (c)(8) and (t) and the statutory notes setting out MAHRA sections 524 and 579 and the Rental Assistance Demonstration.
• 42 U.S.C. 1437p, demolition and disposition of public housing.
• 24 CFR 880.611,24 CFR 5.628, and24 CFR 5.630.
• U.S. Department of Housing and Urban Development,"Rental Assistance Demonstration (RAD)".
• U.S. Department of Housing and Urban Development,"About RAD Public Housing".
• U.S. Department of Housing and Urban Development,"Rental Assistance Demonstration: Final Implementation, Revision 4", Notice H-2019-09 PIH-2019-23 (HA) (September 5, 2019).
• U.S. Department of Housing and Urban Development,"Economic Growth Regulatory Relief and Consumer Protection Act: Implementation of National Standards for the Physical Inspection of Real Estate (NSPIRE)", final rule, Federal Register (May 11, 2023), FR Doc. 2023-09693.
• Congressional Research Service,"The Section 8 Project-Based Rental Assistance Program", In Focus IF12545 (December 2023).
• National Center for Housing Management,"The Complete Guide to Your Section 8 Contract Renewal Options".
• National Low Income Housing Coalition,"HUD's Office of Multifamily Housing Issues Updated Rent Comparability Guidance in Chapter 9 of Section 8 Renewal Policy Guidebook"(April 3, 2023).