How these deadlines are sourced

A filing deadline is only worth reading if you can tell where it came from. This page is the whole method: what we read, how we record it, what we do when offices disagree, and what we will not do.

Where a date comes from

Every date is read from the page of the office that actually sets or administers it — usually the county property appraiser or assessor, and the state revenue department where the rule is statewide. Not from another aggregator, not from a news article, and not from a previous year's copy of this site.

Each county page carries three things together: the date, the office's own sentence quoted rather than paraphrased, and the day that sentence was read. If you disagree with our date, the quote tells you exactly what we were looking at, and the link takes you to it.

What the dates currently cover

• 44 counties across 5 states have a page here, each with its own source link.
• 1 further record exists in the data with no page. What we could read about it was not enough to publish, so nothing is published. The home page counts all 45 records; this page counts the ones you can actually read.
• All of them read on 2026-08-04, which is the date shown on every page — never the day the site was rebuilt.

When offices disagree

It happens: a county's exemption page and its forms page can carry different dates, or a county can restate a state rule its own statute modifies. We do not resolve it by choosing the one that reads better. Both are published, both are attributed, and the page says plainly that the county contradicts itself — because the useful thing for you is knowing to call, not a confident answer that might be the wrong one.

What we could not source, we say

Some counties publish a deadline and nothing about what happens if you miss it. Others give a filing window without saying whether postmark or receipt counts. Those gaps are printed on the county page under what the page does not have. A blank is indistinguishable from a zero, and neither is indistinguishable from an answer.

How these pages are made

Two things, and they are worth keeping apart. The facts — the date, the office's own sentence, the day it was read — are copied from the page of the office that sets them, and every county page names that page and that day so you can check it against the source rather than against us. The pages are built by a program from that record, which is why every county carries the same fields in the same order, and why a county with a gap in its record shows the gap instead of a plausible sentence covering it.

The wording around those facts is written with AI assistance. The facts are not: nothing on this site is a date a model produced, and a date with no source link beside it is not published at all. This is said here because it is true, and because it points at the check that actually matters — the source link and the reading date next to every deadline lead to the county, not to us.

Dates move, and this site can be behind

Offices change deadlines, occasionally at short notice. Every page shows the day it was read, and the footer says the same thing this paragraph does:if the page you are on is older than the notice on your county's site, the county's site is right and we have not caught up. The reading date is published so you can make that judgement, not so it can be hidden behind a fresh-looking design.

What this site is not

• Not a government service. No affiliation with any county, state or agency, and no ability to file anything for you.
• Not legal or tax advice. A deadline is a fact about a form; whether you qualify, and what it saves you, is not something this site decides.
• Not a filing service. There is no account, no form, and nothing to buy. Every county page links you to the office's own page and stops there.
• Not paid placement. No county appears or ranks here because anyone paid.

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