Free national reference

Property tax appeal deadlines, by state.

Every state has its own appeal calendar -- some open in the spring, some in the fall, most have a single firm deadline that closes the door for a year. This is the working reference we use internally, made public.

Covering 50 states + DC · Updated May 2026

Verify before filing. Statutory deadlines change, and many counties operate on their own schedule inside the state framework. Always confirm the current year's window with the assessor or appeal board for the specific jurisdiction before relying on a date.

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Pick your state to view its property tax appeal calendar.

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Pick a state above to see its property tax appeal deadlines.

For tax appeal firms

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Deadlines are useful. A ranked list of every over-assessed commercial property in your county, with owner contact and appeal hooks, is the actual product. We pull custom datasets for any U.S. county on demand.

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