Reference

DDA & QCT Lookup

Checks a location against HUD’s Qualified Census Tract (QCT) and Difficult Development Area (DDA) lists for a selected designation year, and shows whether the site may qualify for the up-to-30% eligible basis boost under IRC §42(d)(5)(B).

Step by step

1. Choose a lookup type

   Pick Address, Census Tract, ZIP Code, or County FIPS. An address checks both designations for one site; the other tabs each answer part of the question.

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2. Look up an address

   Type the full street address with city, state, and ZIP, then click Look Up. At the property, Use My Location checks where you are standing.

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3. Read the results

   Each card shows Yes, No, Depends, or Not determined. When either is Yes, the site may qualify for up to a 30% eligible basis boost under IRC §42(d)(5)(B).

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4. Check the location and map

   Confirm the matched address, census tract, county, ZCTA, and HUD area, and zoom the map to make sure the pin landed on the property.

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5. Look up a census tract

   Enter all 11 digits to check QCT status. In a metro county the DDA shows Not determined, because metro DDAs are designated by ZCTA.

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6. Look up a ZIP code

   A ZIP checks metro Small DDA status only. When a ZIP crosses HUD metro areas you may see Depends with each area listed; an address lookup settles it.

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7. Look up a county

   Enter the 5-digit county FIPS to check nonmetro DDA status and see how many QCTs the county has.

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8. Year, limits, and next steps

   Choose the Designation Year, use Clear to start over, and open About for details. State-designated areas are not covered, so confirm results on HUD’s official maps.

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What you get

QCT and DDA status badges (Yes, No, Depends, or Not determined), a basis boost summary, location details (tract, county, ZCTA, metro and HUD area), a table of HUD areas when a ZIP crosses metro lines, and a map for address and GPS lookups. There is no export.

Tips & notes

• An address lookup answers both questions at once. A ZIP only answers metro DDA status, and a tract only answers QCT status (plus DDA status in nonmetro counties).
• Metro DDAs are designated by ZIP Code Tabulation Area; nonmetro DDAs by county.
• Some ZIPs cross HUD metro area lines and are designated in one area but not the other. Use the full address to resolve it.
• State-designated basis boost areas are not included. Confirm results on HUD’s official maps before relying on them.