LIHTC Acquisition/Rehab with 4% Bonds — Dual Basis, Eligible Costs, and the Resyndication Pipeline

Why Acquisition/Rehab

Acquisition/rehab is the dominant deal type in the LIHTC ecosystem by transaction volume. According to HUD's study "What Happens to LIHTC Properties at Year 15 and Beyond?", approximately 42% of LIHTC properties that reach Year 15 are resyndicated — acquired by a new (or existing) developer, rehabilitated, and re-entered into the LIHTC program for a new 15-year compliance period. This creates a recurring pipeline of deals that is fundamentally different from new construction.

The economics are compelling. An existing affordable property has operating history, established tenancy, and known physical condition. The acquisition price is often below replacement cost, which means the total development cost for an acquisition/rehab is typically 40-60% of an equivalent new construction project. The trade-off: the developer must navigate a more complex credit calculation (dual basis), comply with additional IRS rules (the 10-year rule, related-party restrictions), and manage construction within an occupied building.

Most acquisition/rehab deals use the 4% credit paired with tax-exempt bonds. The 4% path is preferred for three reasons: it avoids the competitive 9% allocation process, it provides credits on both the acquisition and rehabilitation components, and the timing flexibility of bond financing aligns well with acquisition closings that have hard deadlines.

The Dual Basis Structure

The defining feature of a LIHTC acquisition/rehab deal is the dual basis calculation. The IRS treats the acquisition component and the rehabilitation component as separate credit-generating events, each with its own eligible basis and its own credit rate.

Acquisition basis

The acquisition eligible basis is the purchase price of the existing building (excluding land), as defined in IRC Section 42(d)(2). Land is never included in basis. The acquisition basis generates the 4% credit — always 4%, regardless of whether the project uses bonds or receives a competitive 9% allocation. The acquisition component is always the "30% present value credit" under IRC Section 42(b)(1)(B).

Key constraint: the acquisition basis does not qualify for the 130% basis boost in Qualified Census Tracts or Difficult Development Areas. The boost applies only to rehabilitation and new construction basis. This is one of the most commonly missed rules in acquisition/rehab underwriting.

Rehabilitation basis

The rehabilitation eligible basis is the total of all qualified rehabilitation expenditures — the hard and soft costs of the renovation work. If the project uses tax-exempt bonds (4% deal), the rehab basis generates the 4% credit. If the rehab component receives a competitive 9% allocation, it generates the 9% credit. In theory, a project can pair 4% acquisition credits with 9% rehab credits, though this requires two separate allocations and is uncommon.

The rehabilitation basis does qualify for the 130% basis boost if the project is in a QCT or DDA. This is an important asymmetry: the boost applies to rehab but not to acquisition. In a deal where the rehab budget is a large share of total cost, the boost can significantly increase total credits.

Combined credit generation

The total annual credit is the sum of the acquisition credit and the rehabilitation credit, calculated independently:

Acquisition credit: Acquisition basis × applicable fraction × 4% rate
Rehabilitation credit: Rehab basis × applicable fraction × 4% (or 9%) rate
Total annual credit: Acquisition credit + Rehabilitation credit

The 10-Year Rule

To claim the 4% acquisition credit, the building must meet the 10-year rule established under IRC Section 42(d)(2)(B): the building must not have been placed in service by any person within the 10 years preceding the acquisition date. In practice, this means the building must be at least 10 years old, and no substantial renovation that would trigger a new "placed in service" date can have occurred within that window.

Exceptions to the 10-year rule

The IRS provides several exceptions that are critical for practitioners:

• Federally assisted buildings. Properties with existing HUD project-based assistance (Section 8, Section 236, Section 221(d)(3) BMIR) are exempt from the 10-year rule. This is a major exception because many acquisition/rehab targets are aging HUD-assisted properties.
• Foreclosure/distress acquisitions. Buildings acquired from a lender after foreclosure, or through a deed in lieu of foreclosure, are exempt. This exception facilitated the acquisition of failed LIHTC properties during the 2008-2012 financial crisis.
• LIHTC properties after compliance period. Properties where the initial 15-year compliance period has expired can be resyndicated even if the building was "placed in service" within 10 years of the new acquisition — provided the new acquisition is from an unrelated party.

The related-party rule

The acquisition credit is not available when the buyer and seller are "related parties" as defined under IRC Section 42(d)(2)(D)(iii), incorporating the related-party tests of IRC Sections 267(b) and 707(b). This prevents developers from selling properties to themselves (or affiliated entities) to generate new credits. The definition of "related party" is broad: it includes family members, entities with common ownership exceeding 10%, and partnerships where the same person owns more than 10% of each entity.

In Year 15 resyndications, this rule requires careful structuring. If the existing general partner wants to remain involved in the resyndicated deal, the acquisition must be structured to avoid related-party status — typically by ensuring the GP's ownership in the new entity is below the threshold and that the purchase price is at fair market value.

Eligible Rehab Expenditures

Not every dollar spent on rehabilitation qualifies for the LIHTC. The eligible basis includes only expenditures that are properly chargeable to the building's capital account — costs that extend the useful life of the building or adapt it to a new use. This distinction matters because ineligible costs reduce the credit amount and can create an unresolved gap in the capital stack.

Eligible costs

• Structural repairs and replacements: Roof replacement, foundation repair, structural framing, exterior walls and cladding
• Building systems: HVAC replacement, plumbing, electrical (including panel upgrades), elevator modernization, fire suppression
• Unit interiors: Kitchen and bath renovation, flooring, fixtures, appliances (if installed as part of the rehab scope), cabinets, countertops
• Accessibility improvements: ADA compliance work, accessible unit conversions, common area accessibility
• Energy efficiency upgrades: Insulation, window replacement, high-efficiency mechanical systems, solar (if building-integrated)
• Soft costs attributable to rehab: Architecture and engineering for the rehab scope, construction management, environmental remediation (lead, asbestos), construction period interest, permits
• Site improvements: Parking lot resurfacing, site drainage, landscaping (if part of the overall rehab scope — treatment varies by state)

Ineligible costs

• Land and land improvements not integrated with the building
• Personal property not permanently attached to the building (furniture, movable equipment)
• Acquisition cost of the building (this goes into acquisition basis, not rehab basis)
• Operating expenses disguised as capital (routine maintenance, minor repairs that don't extend useful life)
• Costs attributable to commercial space in mixed-use buildings
• Syndication and organizational costs

Substantial Rehabilitation Threshold

To qualify for rehabilitation credits, the project must meet the substantial rehabilitation test under IRC Section 42(e): rehabilitation expenditures during any 24-month period must equal or exceed the greater of:

• $6,000 per low-income unit (the federal statutory minimum, adjusted periodically), or
• 20% of the adjusted basis of the building as of the first day of the 24-month expenditure period

The $6,000 per unit threshold is rarely the binding constraint — most rehab projects spend $30,000-$80,000 per unit. The 20% of adjusted basis test is more commonly relevant, particularly for properties acquired at high prices where the adjusted basis is substantial.

State HFAs often impose higher per-unit minimums, as documented in NCSHA's annual survey of state QAP policies. Many states require $15,000-$25,000 per unit in rehabilitation expenditures as a condition of credit allocation, independent of the federal $6,000 minimum. These state requirements are driven by the policy goal of ensuring meaningful physical improvement, not just cosmetic work designed to generate credits, consistent with the National Housing Preservation Database tracking by the NLIHC and the National Housing Trust.

The 24-month expenditure period

The developer selects the start date of the 24-month period. All rehabilitation expenditures within that window count toward the substantial rehabilitation test. The building is treated as "placed in service" at the end of the 24-month period (or when the rehab is complete, if earlier). This placed-in-service date is critical: it triggers the start of the 10-year credit period and the 15-year compliance period.

For occupied buildings, the 24-month period must account for phased construction. Tenants cannot all be relocated at once, so the rehab proceeds unit by unit or building by building. The developer must plan the construction schedule to ensure all expenditures fall within the elected 24-month window while minimizing tenant disruption.

The Year 15 Resyndication Pipeline

Year 15 is the end of the initial LIHTC compliance period. At this point, the investor's credits have been fully delivered, the extended use agreement remains in effect, and the property typically needs capital reinvestment after 15 years of operation under restricted cash flow. This creates a natural acquisition/rehab opportunity.

How resyndication works

1. Investor exit. The limited partner (investor) exits the partnership, typically by selling their interest to the general partner for a nominal amount or through a put/call option specified in the partnership agreement. The investor's economic interest in the property was the tax credits, which have been fully claimed.
2. Property transfer. The general partner (or a new developer) acquires the property. If the GP acquires it, the related-party rules apply and must be navigated. If a new developer acquires it, the transaction is more straightforward.
3. Physical needs assessment. A new PNA establishes the rehab scope. After 15 years, most properties need significant capital work: roof replacement, HVAC overhaul, unit interiors, accessibility upgrades, and energy efficiency improvements.
4. New credit application. The developer applies for new 4% credits (paired with bonds) or 9% credits (competitive allocation). The acquisition basis is the purchase price of the building (minus land). The rehab basis is the cost of the renovation work.
5. New compliance period. The resyndicated property enters a new 15-year compliance period with a new investor, new financing, and renewed physical condition.

Acquisition pricing in resyndications

The acquisition price in a Year 15 resyndication is a negotiated value, but it is constrained by two factors: the property's appraised value (required by the syndicator and senior lender) and the project's ability to carry the resulting debt or generate sufficient acquisition credits. In many resyndications, the acquisition price is well below replacement cost — often $20,000-$60,000 per unit — because the property's income is restricted and its physical condition has deteriorated.

The low acquisition price means the acquisition credit component is relatively small. The majority of credits come from the rehabilitation basis. This is the inverse of a market-rate acquisition where the purchase price dominates — in a LIHTC resyndication, the value is created by the rehab investment, not the acquisition.

Common Mistakes

These are the errors that most frequently derail acquisition/rehab underwriting:

• Applying the basis boost to acquisition basis. The 130% QCT/DDA boost applies to rehabilitation basis only. Applying it to acquisition basis overstates credits by 30% on the acquisition component. This is wrong in a surprisingly large percentage of preliminary pro formas.
• Ignoring the 10-year rule. If the building was placed in service within the past 10 years (and no exception applies), there is no acquisition credit. The entire deal economics change if the acquisition credit is eliminated. Verify the placed-in-service history before underwriting.
• Conflating acquisition price with acquisition basis. Acquisition basis is the building-only purchase price minus land and any ineligible items. If the purchase price includes land, furniture, or other non-basis items, those must be carved out. An appraisal with a land/building split is essential.
• Underestimating the rehab scope. The PNA must be comprehensive. Missing a major building system — roof, HVAC, plumbing — means the rehab budget is understated, which means credits are understated and the deal has an unresolved gap. Worse, discovering the deficiency during construction creates a change order that may not qualify for basis if it falls outside the 24-month expenditure period.
• Missing the substantial rehabilitation threshold. The developer must verify that rehab expenditures exceed the greater of $6,000/unit or 20% of adjusted basis within the elected 24-month period. If the rehab scope is modest and the adjusted basis is high (because of a high acquisition price), the 20% test may not be met.
• Failing to allocate costs between acquisition and rehab basis. Soft costs must be allocated to the correct basis pool. Architecture fees for the rehab go in rehab basis. Legal costs for the acquisition go in acquisition basis (or are excluded from basis entirely, depending on the nature of the cost). Misallocation shifts credits between the two pools and can trigger errors on the 8609.
• Not planning for tenant relocation. Occupied rehab requires a relocation plan, temporary housing for displaced tenants, and compliance with the Uniform Relocation Act if federal funds are involved. Relocation costs are real — $5,000-$15,000 per household — and must be budgeted. Some of these costs may not be includable in eligible basis.

How to Model It

An acquisition/rehab pro forma requires several tabs that don't exist in a standard new construction LIHTC model:

Acquisition basis tab

Purchase price → land allocation (from appraisal) → building value → less ineligible items → eligible acquisition basis → applicable fraction → qualified acquisition basis → × 4% rate → annual acquisition credit. No basis boost. This calculation is always at the 4% rate, regardless of the project's overall structure.

Rehabilitation basis tab

Hard rehab costs (from PNA/scope of work) + eligible soft costs → total rehab expenditures → less ineligible items → eligible rehab basis → basis boost (if QCT/DDA) → applicable fraction → qualified rehab basis → × 4% (or 9%) rate → annual rehab credit. Include the substantial rehabilitation test: does the total exceed $6,000/unit and 20% of adjusted basis within 24 months?

Combined credit and equity tab

Acquisition credit + rehabilitation credit = total annual credit × 10 years × credit pricing = total tax credit equity. This tab should show the contribution of each basis pool to the total equity, so the underwriter can see which component is driving the deal economics.

Physical needs assessment integration

The PNA should be summarized in a tab that maps building systems to cost estimates, useful life, and replacement timing. This tab drives the rehab budget and ensures alignment between the PNA, the scope of work, the construction contract, and the eligible basis calculation. If the construction contract exceeds the PNA-supported scope, the excess may need to be justified to the HFA and syndicator.

Sensitivity analysis

For acquisition/rehab deals specifically, test: acquisition price (±10%), rehab scope (±15%), credit pricing (±$0.04), and interest rate (±75 bps). Show the impact on total credits, equity, gap, and DSCR. The rehab scope sensitivity is particularly important because construction cost escalation during the 12-18 month predevelopment period can materially change the deal economics.

Related Articles

This article is part of the LIHTC underwriting series. Each article goes deeper into a specific aspect of tax credit deal structuring:

• LIHTC 101: How the Program Works — The foundational overview of 4% vs 9% credits, credit calculations, and deal structure.
• Rent and Income Limits — AMI calculations, maximum rents by household size, and set-aside elections.
• The LIHTC Capital Stack — Soft debt, deferred developer fee, HOME funds, and gap financing.
• 4% LIHTC with Tax-Exempt Bonds — Bond deal mechanics, the 25% test, and how to size the bond tranche.
• LIHTC Investor Returns — Credit pricing mechanics, investor yield calculations, and pay-in schedule structuring.
• Year 15 Exit Strategies — Compliance period obligations, resyndication, and disposition options.