October 12, 2026

HUD published its 2027 Qualified Census Tract (QCT) and Difficult Development Area (DDA) designations on October 6, 2026. Developers and investors should review pending transactions now, as designation status can affect the eligible basis used to calculate Low-Income Housing Tax Credits. The practical priority is to verify each site and coordinate financing milestones before relying on the basis increase. [1]

Why the designations matter

Under Section 42(d)(5)(B), qualifying new construction in a designated QCT or DDA receives a 30% increase in eligible basis. For an existing building, the increase applies to qualifying rehabilitation expenditures rather than to acquisition basis. The benefit can support additional tax credit equity, subject to the applicable fraction, credit rate, agency underwriting, and other project limitations. [2]

For example, assume a new building has $10 million in eligible basis before the increase and a 100% applicable fraction. The designation increases eligible basis to $13 million. At an assumed 9% credit rate, that represents a potential increase of $270,000 in annual credits before agency limitations. This illustration is a basis calculation, not a prediction of the allocation or equity proceeds a particular project will receive.

A state housing credit agency may also designate certain buildings for a basis increase based on financial feasibility. That separate authority does not apply to buildings that receive credits under the tax-exempt bond provisions of Section 42(h)(4). Developers should distinguish the source of the increase in their underwriting and documentation. [2]

Verify the actual project location

QCTs identify census tracts that meet specified income or poverty criteria, subject to statutory population limits. DDAs identify areas with high land, construction, and utility costs relative to the area median income. [3]

HUD provides the 2027 metropolitan and nonmetropolitan lists, downloadable QCT data, and an address locator. Metropolitan DDA verification uses Census ZIP Code Tabulation Area boundaries. HUD directs users to its locator rather than relying solely on the postal ZIP code assigned to a property. [3, 4]

As a practical review step, retain the applicable list, the dated locator result, and the project location information in the development file. For sites near a boundary, confirm the location of each building. Compare QCT and DDA status across designation years before concluding that a financing assumption must change.

Apply the effective dates carefully

The 2027 lists apply to credit allocations made after December 31, 2026. For Section 42(h)(4) bond-financed buildings, both bond issuance and placement in service must occur after December 31, 2026. [1]

If an area loses its designation on a subsequent list, the notice provides transition protection. For allocated credits, submit a complete application before the subsequent list's effective date, with allocation occurring within 730 days of submission. For bond projects, either bond issuance or placement in service must occur within 730 days of a timely, complete application to the bond-issuing agency; both events must follow submission. The receiving agency determines whether an application is complete. [1]

These rules make transaction scheduling part of the basis analysis. Maintain a calendar that tracks application submission, agency confirmation of completeness, allocation, bond issuance, and anticipated placement in service. If a site loses status between 2026 and 2027, review the applicable prior-year notice rather than assuming that the new list alone resolves eligibility.

Multiphase developments warrant a separate review of the notice's specific conditions. [1] Do not assume that a designation relied on for the first phase automatically protects every subsequent building.

Recommended review for owners and investors

We recommend reviewing the 2027 designations for all pending developments and resyndications, updating underwriting as appropriate, and documenting the designation year and the timing rule supporting any increase. Review the results with the allocating or bond-issuing agency and the project's tax professionals before changing closing assumptions.

Management teams should continue to apply the property's governing income limits, rent restrictions, and certification requirements. The QCT and DDA review belongs in the development and tax credit analysis; it does not, by itself, establish new tenant income or rent limits. Owners should provide asset managers with a clear record of the financing determination so that future reviews can trace the basis increase to the correct source.

Sources

1. HUD notice published October 6, 2026, 91 FR 63573-63578, especially Section VII

2. Internal Revenue Code Section 42, especially subsections (d)(5)(B), (g) and (h)

3. HUD User QCT and DDA designation lists and datasets

4. HUD User table generator and address verification guidance