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2025 Tax Calendar: Every Important Deadline You Need to Know

Complete 2025 tax calendar with all federal filing deadlines, estimated payment dates, extension deadlines, and key dates for individuals and businesses.

By Taxation.ai Team | January 1, 2025 | Updated February 1, 2025

January 2025

Jan 15: Q4 2024 estimated tax payment due

Jan 27: IRS begins accepting 2024 returns

Jan 31: Employers must send W-2s; 1099-NEC deadline

February 2025

Feb 18: 1099-B, 1099-S, and 1099-MISC (non-NEC) deadline

March 2025

Mar 17: S-Corp (Form 1120-S) and Partnership (Form 1065) return deadline; extended to Sep 15

April 2025

Apr 15: Individual return deadline (Form 1040); Q1 2025 estimated payment; IRA/HSA contribution deadline for 2024; extension request deadline (Form 4868)

June 2025

Jun 16: Q2 2025 estimated payment; expat filing deadline (automatic 2-month extension)

July 2025

Jul 31: German tax return deadline for 2024

September 2025

Sep 15: Q3 2025 estimated payment; extended S-Corp and Partnership returns due

October 2025

Oct 15: Extended individual return deadline; UK Self Assessment paper filing deadline (2024/25)

January 2026

Jan 15: Q4 2025 estimated payment

Jan 31: UK Self Assessment online filing deadline (2024/25)

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