Tax Deadlines for the Remainder of 2026

May 15, 2026: 2025 Tax-Exempt Organization (with a year end of 12/31) tax returns due 

June 15, 2026: Second Quarter 2026 estimated tax payments due

September 15, 2026: Third Quarter 2026 estimated tax payments due

September 15, 2026: Extended 2025 S-Corporation and Partnership tax returns due

September 30, 2026: Extended 2025 Fiduciary (with a year end of 12/31) tax returns due

October 15, 2026: Extended 2025 Individual tax returns due

October 15, 2026: Extended 2025 C-Corporation (with a year end of 12/31) tax returns due

November 16, 2026: Extended 2025 Tax-Exempt Organization (with a year end of 12/31) tax returns due 

December 31, 2026: Due date to take the 2026 RMD for those 73 and older 

January 15, 2027: Fourth Quarter 2026 estimated tax payments due

Remember that if you extended your tax return(s), this is an extension to file only. It is not an extension to pay any tax due. If you owe tax and have not paid it yet, do so as soon as possible to reduce penalties and interest.