Section 45L Before the Lights Go Out: How Builders and Developers Can Still Claim $2,500 to $5,000 Per Unit Before June 30, 2026

If you build single-family homes, manufactured homes, or multifamily projects, the One Big Beautiful Bill Act just put a hard deadline on one of the most valuable tax credits in the construction industry. The Section 45L New Energy Efficient Home Credit—originally scheduled to run through 2032—now ends for homes acquired after June 30, 2026. Every unit you sell or first lease before that date can still earn between $500 and $5,000, but only if the certification, the labor records, and the paperwork are lined up before the certificate is issued.

The credit has paid out billions to home builders since 2006, and the 2023–2026 version is by far the most generous it has ever been. The catch is that it does not work the way most builder tax incentives work. You cannot apply for it after the fact, you cannot self-certify, and you cannot patch missing prevailing wage records once the unit changes hands. This guide walks through exactly who qualifies as an eligible contractor, what the four credit tiers actually require, and how to land the claim on Form 8908 without losing the cost basis you need for depreciation or LIHTC.

What Section 45L Pays — and What Changed in 2026

For the period that started January 1, 2023, the credit is structured around two certification programs (ENERGY STAR and the Department of Energy's Zero Energy Ready Home program, recently renamed DOE Efficient New Homes) and two building types (single-family/manufactured versus multifamily).

The per-unit credit amounts are:

Two things to internalize:

1. For single-family and manufactured homes, the higher Zero Energy Ready amount is automatic when the standard is met. Prevailing wage is not required for these dwelling types.
2. For multifamily, you forfeit 80% of the credit if you cannot document prevailing wage compliance. A 60-unit multifamily project at the ENERGY STAR level is worth $30,000 without prevailing wage and $150,000 with it. At the Zero Energy Ready tier, the same project moves from $60,000 to $300,000.

The OBBBA change accelerated the sunset by more than six years. Homes acquired (sold or first leased) after June 30, 2026 are not eligible, regardless of when construction started.

Who Counts as the "Eligible Contractor"

The most expensive misconception in this credit is that the framer, general contractor, or trade who physically built the unit gets to claim it. They almost never do. The Internal Revenue Code defines the eligible contractor as the person who constructed the qualified new energy-efficient home and owned and had a basis in the home during its construction.

In practice, this means:

• If a builder-developer owns the land and the work-in-progress and hires subcontractors to do the actual labor, the builder-developer is the eligible contractor, not the subs.
• If a real estate developer hires a general contractor under a fixed-price construction agreement and keeps title and risk of loss throughout the build, the developer is the eligible contractor.
• If a manufactured home producer builds homes for sale to a third-party retailer who then sells to the homeowner, the producer is the eligible contractor.
• A contractor who builds on the customer's land—where the customer holds title during construction—does not qualify, because the contractor never had a basis in the home itself.

For the credit to apply at all, the eligible contractor must sell or lease the qualifying dwelling to a person who will use it as a residence during the tax year. A unit a builder keeps for personal use, holds as a model home indefinitely, or rents to a corporate entity for non-residential use is not "acquired" within the meaning of the statute.

For multifamily, "acquired" generally means the first lease of each dwelling unit to a tenant for residential use. That is what triggers the credit—not the project's certificate of occupancy.

ENERGY STAR Versus Zero Energy Ready: Which Standard to Target

Both certifications require a third-party rater—almost always a Home Energy Rating System (HERS) Rater—to perform plan review, on-site inspections, blower-door and duct-leakage testing, and a final certification before the unit is sold or leased. The eligible certifier cannot be your employee. Pick the standard at the design stage, not at framing.

ENERGY STAR is the lower bar and the more familiar one. For 45L, the home must be certified to a program version with a state-specific effective date matching when permitting or construction occurred. For most single-family permits pulled in 2023 or later, the minimum is ENERGY STAR Single-Family New Homes (SFNH) Version 3.1 or 3.2 depending on the state. Manufactured homes follow the ENERGY STAR Manufactured Homes program. Multifamily units use ENERGY STAR Multifamily New Construction (MFNC) Version 1.1 or later.

DOE Zero Energy Ready Home is the more demanding tier. A Zero Energy Ready home must already qualify for ENERGY STAR and then layer on additional requirements drawn from the EPA's Indoor airPLUS program, a building envelope tight enough to be solar-ready, and HVAC systems sized to a Manual J load calculation. The payoff is double the credit. For an 1,800-square-foot production home, the incremental cost of going from ENERGY STAR to Zero Energy Ready is often $4,000 to $8,000, while the credit difference is exactly $2,500 per unit. If your design build already incorporates heat pumps, mechanical ventilation, and tight envelope construction, the upgrade can pay for itself on the credit alone before any energy savings show up on the homeowner's bill.

For builders sitting on the fence in 2026, a useful rule of thumb: target ENERGY STAR for spec homes already framed, target Zero Energy Ready for any units still in plan-set review.

The Prevailing Wage Trap on Multifamily

For multifamily, prevailing wage is the difference between a token credit and a meaningful one. The rule is unambiguous and unforgiving. To claim the increased $2,500 or $5,000 amount, every laborer and mechanic employed by the contractor or any subcontractor on the construction, alteration, or repair of the multifamily project must have been paid not less than the prevailing wage rates as determined by the Secretary of Labor for the locality and the labor classification.

This means:

• You need certified payroll records for every trade.
• You need wage determinations pulled from the SAM.gov Wage Determinations OnLine database (formerly WDOL.gov) before construction begins, matched to the specific Davis-Bacon labor classification.
• If a worker was misclassified or underpaid, you can cure the error within the regulatory window by paying back wages plus an interest premium and, in some cases, a penalty to Treasury—but only if you catch and correct it before the IRS does.
• Apprenticeship requirements (the second leg of the broader prevailing wage and apprenticeship framework under the Inflation Reduction Act) do not apply to Section 45L. Only the wage rates matter.

You file Form 7220, Prevailing Wage and Apprenticeship (PWA) Verification and Corrections, attached to your return to substantiate the increased credit. A separate Form 7220 is required for each project for which you claim the bumped amount.

Where builders most often lose the credit on this point:

1. The general contractor signs a fixed-price contract with subs and never sees the sub's actual payroll, so they cannot prove what was paid.
2. The wage determination on file is the wrong county, or the wrong "type of construction" (residential vs. building vs. heavy).
3. Apprentices are paid at the journeyman ratio listed in the wage determination instead of the apprenticeship-program ratio—this is a misclassification, not a wage shortfall, and it triggers cure obligations.

If you are mid-construction on a multifamily project today and do not have certified payroll, start a forensic reconstruction now. Without it, the credit drops from $5,000 to $1,000 (or from $2,500 to $500) per unit, which on a 100-unit garden-style project is a $400,000 swing.

The Basis Reduction Rule and the LIHTC Carve-Out

Section 45L is a general business credit, and it is subject to the basis-reduction regime in Section 280C. You must reduce the basis of each qualifying home by the amount of the 45L credit you claim. For a tract builder this means your cost of goods sold for that unit is smaller by the credit amount, so the credit's after-tax value depends on your marginal tax rate and the inventory holding pattern.

There is one critical exception that affordable housing developers should never miss. You do not reduce the basis of a building for purposes of the low-income housing tax credit (LIHTC) under Section 42 by the 45L credit. That means a developer who pairs LIHTC with 45L gets to claim both the full LIHTC eligible basis and the 45L credit on each qualifying unit—a stacking benefit Congress explicitly preserved when it wrote the 2022 amendments. For 9% LIHTC projects in particular, layering 45L at the $5,000 per-unit Zero Energy Ready level with prevailing wage compliance is one of the few ways to add hundreds of thousands of dollars in non-dilutive equity to a deal without affecting the LIHTC basis.

For market-rate multifamily, the basis reduction does apply, and it reduces your depreciable basis in the building. Run the after-tax math: at a 21% corporate rate, a $5,000 credit reduces depreciation by $5,000 spread over 27.5 years, so the net economic value of the credit is roughly $4,900, not $5,000. Still extraordinary—just not free.

How to Actually Claim It: Form 8908 Mechanics

The mechanics are straightforward if your underlying records are in order:

1. Get the certificate before acquisition. Your HERS rater or other eligible certifier must issue the ENERGY STAR or Zero Energy Ready certificate before the unit is sold or first leased. Certificates issued after acquisition are routinely rejected on audit.
2. Collect the certificates and keep them with the unit file. You are not required to attach them to your return, but you must retain them. Each certificate identifies the certifier, the program version, and the specific dwelling.
3. File Form 8908 with the eligible contractor's return. Part I collects unit counts by credit tier (lines 1a through 4b in the current revision). Part II identifies each certifier by name, address, and TIN. The total certifications on line B must equal the unit totals from Part I.
4. Attach Form 7220 if you are claiming the higher multifamily amounts on lines 3b or 4b. Without it, the increased credit is disallowed even if the wages were actually paid.
5. Carry the credit through to Form 3800, General Business Credit. Section 45L is non-refundable but follows the general business credit carryback (1 year) and carryforward (20 year) rules. For pass-through builders, the credit flows through to partners or S corporation shareholders on the K-1.
6. Reduce the unit's cost basis in your books by the credit amount, except for LIHTC basis.

The most common Form 8908 mistakes are:

• Including units that were never acquired in the tax year. The credit attaches to the acquisition year, not the construction year. A spec home certified in November 2025 but unsold at year-end belongs on the 2026 return, not the 2025 one.
• Counting the same multifamily unit under both the lower and higher credit tier. Each unit goes in exactly one column.
• Listing the prime contractor as the certifier. The certifier is the rating organization or individual HERS rater, not the company that hired them.

Timing Strategy for the Final 13 Months

With June 30, 2026 closing in, builders and developers have three practical choices for any unit still in production:

• Accelerate the closing or first lease into the eligible window. A unit that would have closed in July 2026 is worth $2,500 to $5,000 more if it closes June 29 instead. For multifamily, that means getting tenants in—at least one signed lease per unit—before July 1.
• Lock in certification early. HERS raters typically book up in the last quarter of any credit sunset. Reserve your inspections and final testing now if you have not already.
• Document prevailing wage retroactively. If you are building multifamily and never set up Davis-Bacon-style payroll, start now. Reconstruction is possible but expensive, and the time pressure compounds with each pay period that passes without certified payroll.

For units that genuinely cannot reach acquisition by June 30, 2026, the credit is simply gone. There is no transition rule and no good-faith extension. The OBBBA drafters deliberately wrote a hard date rather than a soft phase-out.

Keep Your Construction Books Audit-Ready From Day One

Section 45L is one of those rare tax provisions where the math is generous but the documentation requirements are unforgiving. Builders who lose the credit on audit almost always lose it on records, not on substance: missing certifier credentials, gaps in certified payroll, units acquired in the wrong tax year, or basis reductions never booked. Plain-text accounting makes that kind of mistake harder. Beancount.io gives you transparent, version-controlled financial records for every unit, every project, and every credit you claim—so when the IRS asks for the trail, you produce it instead of reconstructing it. Get started for free and bring the same discipline to your books that your HERS rater brings to your blower-door test.