Methodology
How we verify every date on this site
A wrong appeal deadline is worse than no page. This site exists to be trusted with dates, so here is exactly how the dates get here.
Official sources only
Every tax fact — rates, due dates, deadlines, exemption amounts — comes from the county's own published pages (appraisal district, assessor, treasurer, tax collector), the state revenue department, or state statute. Median home values and median taxes paid come from the U.S. Census American Community Survey, and we show the survey years next to the number. Each page lists its sources with links, so you can check us.
Two passes, independently
Every county's data is collected from official pages, then re-checked by a second, independent review that goes back to the official sources from scratch — every payment date, every deadline, every exemption amount. Anything that can't be confirmed on an official page is left blank rather than filled in with a guess. We publish counties only after their critical dates pass this second check.
Dated, and re-dated
Every page carries the month we last verified it ("Verified August 2026") and every rate carries the year it applies to. Deadlines in many states are formulas — "May 15 or 30 days after your notice mails, whichever is later" — so we publish both the rule and this year's resolved date, and when a county extends a deadline mid-season, we update the page and mark it extended.
Refresh cadence
Each state gets a full re-verification pass every year, scheduled around its own calendar — when levies certify and notices mail, not on an arbitrary date. During each state's appeal and payment seasons we additionally watch county announcements for extensions and installment changes.
Corrections
If you find a date that doesn't match what your county's page says today, the county is right and we want to fix it. Email corrections@propertytaxdates.com and include the county page link — corrections ship ahead of everything else.
What this site is not
General information, not legal, tax, or financial advice. We don't know your parcel, your exemption history, or your escrow. For decisions about your specific bill, the county offices linked on every page are the authority.