2026 IRS Key Tax Dates

Individual Tax Deadlines

January 26, 2026: IRS officially opens the 2026 filing season for 2025 tax returns.

February 2, 2026: Deadline for employers to furnish Forms W-2 and for businesses to send 1099-NEC.

April 15, 2026: Deadline for individual federal income tax returns and payments. This is also the deadline to file for an automatic 6-month extension (Form 4868).

April 15, 2026: First-quarter 2026 estimated tax payment due.

June 15, 2026: Second-quarter 2026 estimated tax payment due.

September 15, 2026: Third-quarter 2026 estimated tax payment due.

October 15, 2026: Final deadline for extended individual tax returns (Form 4868).

January 15, 2027: Fourth-quarter 2026 estimated tax payment due.

Business & Partnership Deadlines

March 15, 2026: Partnership (Form 1065) and S-Corporation (Form 1120-S) returns are due.

April 15, 2026: C-Corporation (Form 1120) returns are due.

April 30, July 31, Oct 31, Jan 31: Quarterly employment tax returns (Form 941) are due.