When Does Tax Season End 2025. The federal tax filing deadline (tax day) is april 15, 2025, with an extension deadline of october 15, 2025. This article will cover important key dates for the 2025 tax season, including the tax filing start date, tax deadline, extension filing deadline, extended deadline, estimated tax.

Taxpayers who apply for an extension must file by oct. Tax day is tuesday, april 15, 2025, but some exceptions exist.