The real filing window — not a manufactured countdown.

Pick your state and county. Where the filing deadline is published with a statutory citation, you'll see it — Texas (Tex. Tax Code § 41.44) and Georgia (O.C.G.A. § 48-5-311) are seeded first. For everything else, the page says "data pending" rather than guess. For the all-50 lift — including the procedural notes next to every picker — see /filing-instructions.