Groundcheck now checks the saved property location against HUD's public Qualified Census Tract and Difficult Development Area map layers. These designations are used in the Low-Income Housing Tax Credit program and can be useful early context when an affordable-housing developer is evaluating a site.
This is a financing-context screen, not a hazard or eligibility determination. A mapped QCT or DDA does not mean a project will receive tax credits, qualify for a particular basis treatment, receive an allocation, or obtain zoning or financing approval.
What QCT and DDA mean
HUD designates Qualified Census Tracts under Section 42 using income or poverty criteria. HUD describes Difficult Development Areas as places where land, construction, and utility costs are high relative to area income. Both designations can be relevant to LIHTC eligible-basis calculations under the applicable program rules.
For 2026, HUD says QCT designations use 2020 Census tract boundaries. Metropolitan DDAs use 2020 Census ZIP Code Tabulation Area boundaries. A ZCTA is a Census statistical geography and is not identical to a USPS ZIP Code delivery area.
How Groundcheck runs the screen
Groundcheck sends the saved property coordinate to HUD's public QCT and DDA polygon layers and checks whether that exact point intersects either designation. The headline result uses the property point rather than a parcel-overlap percentage because these designations depend on project location, not on how much of a parcel overlaps a broad tract or ZCTA.
The finding keeps the QCT census tract identifier and the DDA source identifier and metro context when HUD returns them. Groundcheck does not reinterpret the DDA identifier as a USPS ZIP Code or infer a tax result from the mapped attributes.
Why the designation year needs a caveat
HUD USER currently publishes 2026 QCT and DDA designations effective January 1, 2026. The generic HUD GIS layers used for the live point lookup, however, do not expose a designation-year field in their public layer schema.
Groundcheck preserves that distinction instead of labeling every live GIS result as definitively 2026. The report shows that 2026 is HUD's current published designation year, but it also tells users to confirm the current location in HUD's QCT/DDA locator before relying on the screen for underwriting.
What a match can and cannot tell you
A QCT or DDA match is useful because it tells a developer that the site deserves LIHTC-specific follow-up early in due diligence. It can help frame questions for the state housing finance agency, tax-credit counsel, lenders, investors, or other project advisers.
The map does not establish whether a building is a qualified low-income building, whether a basis increase applies, whether a state agency will award credits, or whether the project is financially feasible. A no-match likewise does not mean the project is ineligible for LIHTC or other affordable-housing incentives.
What to verify next
For a site that may use LIHTC financing, confirm the exact proposed building or project location in HUD's current QCT/DDA locator and review the current designation notice. Then confirm the applicable rules with the allocating housing finance agency and qualified tax-credit advisers.
Also keep the financing designation separate from ordinary land-use due diligence. Zoning, utilities, environmental constraints, access, title, site design, and local approvals remain independent questions even when the property is mapped inside a QCT or DDA.
- Confirm the exact project location in HUD's current QCT/DDA locator.
- Use HUD's current annual designation notice rather than assuming a prior year's status carries forward.
- Ask the applicable housing finance agency how the current designation affects the specific LIHTC application.
- Do not treat a QCT or DDA match as a substitute for tax, legal, financing, zoning, or entitlement review.
Use the new layer
Check the property you are considering
Groundcheck combines this source with parcel details and other available national, state, and local layers.
Start a property check See every Groundcheck data layerGroundcheck provides early public data screening, not a legal, engineering, surveying, environmental, planning, permitting, or buildability determination. Verify important findings with the responsible agencies and qualified professionals.