Skip to content

Summary

IRS IRC § 42 Audit Technique Guide — Part I (Introduction and Pre-Contact Analysis) · 2026 edition · updated 2026-07-29 · United States

IRC §42 provides federal tax incentives for equity investments in low-income housing.

The taxpayer can build new housing, or acquire and rehabilitate existing housing. The housing can be apartments, single-family housing, single-occupancy rooms, or even transitional housing for the homeless. The project may include both low- income and market-rate rental units, and a portion of the property may be for commercial use. The housing must qualify as residential rental property; e.g., no hotels, hospitals, or nursing homes, etc.

The taxpayer agrees to provide low-income housing for at least thirty years. The taxpayer receives credit for ten years (credit period), must provide low-income housing under IRS jurisdiction for fifteen years (compliance period), and under the state agency's sole jurisdiction for at least an additional fifteen years (extended use period). All three time periods begin on the same day; i.e., the first day of the tax year in which the building is placed in service, or if the taxpayer elects, the beginning of the following year.

The amount of credit the taxpayer can claim each year is determined as:

Eligible Basis x Applicable Fraction = Qualified Basis

Qualified Basis x Applicable Percentage = Annual Credit Amount

The eligible basis is the total allowable costs associated with the depreciable residential rental project. The applicable fraction is the portion of rental units that are qualified low-income units.

The applicable percentage is the discount factor needed to limit the annual credit to the present value of either 70% or 30% of the qualified basis, depending on the characteristics of the housing.

The allowable credit may be reduced (in part or in whole) if the taxpayer is not compliant with IRC §42 requirements. The taxpayer may also be subject to the recapture of credit claimed in prior years under IRC §42(j).

If a taxpayer disposes of a low-income building (or interest therein), no credit is allowable in the year of the disposition and the taxpayer is subject to recapture unless the taxpayer reasonably expects that the building will continue to be operated as a low-income building for the remaining compliance period.

The program is jointly administered by the IRS and state-authorized tax credit allocating agencies. Each state receives tax credits annually. The agencies are responsible for identifying the state's housing needs, allocating credit to qualifying projects that meet the state's QAP criteria, and monitoring the operating project for on-going compliance with IRC §42. Noncompliance is reported to the IRS.

The IRS' compliance responsibilities include the processing of forms submitted by state agencies and taxpayers, and ensuring compliance through activities such as auditing taxpayers' federal income tax returns.

Get a plain-English answer with a citation back to this text.

Ask AI about this code
▸Contents — IRS IRC § 42 Audit Technique Guide — Part I (Introduction and Pre-Contact Analysis)

GoCodebook provides public access, search, citation, multilingual explanation, and practical interpretation of legally adopted building regulations. It is not a substitute for the official ICC or California code publications.