When Does The 2025 Tax Year Start In Usa. This date marks the due date for the fourth quarterly estimated tax payment for the 2024 tax year. Tax brackets for the 2024 tax year increased slightly to account for inflation.

The internal revenue service (irs) confirmed that the official start date for tax season will be january 27, adding that more than 140 million taxpayers are expected to file. The irs announces the 2025 tax season start date: