Tax season often brings stress and confusion, but knowing the key filing deadlines can make the process easier. Below are the major IRS and state tax deadlines for the 2025 tax year (returns filed in 2026). Mark these dates now so you can stay organized and avoid penalties.
For Individuals
April 15, 2026
Deadline to file your 2025 individual income tax return or request an extension. Even if you file for an extension, any taxes owed must still be paid by this date to avoid interest and penalties.
October 15, 2026
If you requested an extension, this is your final deadline to file your 2025 individual tax return.
For Businesses
S Corporations and Partnerships (Calendar Year)
March 16, 2026 (Since March 15 falls on a Sunday)
Deadline to file 2025 S corporation and partnership returns or request an extension.
September 15, 2026
Extended deadline to file 2025 S corporation and partnership returns.
C Corporations (Calendar Year)
C corporations that use a standard calendar year follow the same deadlines as individuals:
- April 15, 2026 for filing or extension
- October 15, 2026 if an extension was filed
Trusts and Estates (Form 1041)
April 15, 2026
Deadline to file a trust or estate return (Form 1041) or request an extension.
September 30, 2026
Extended deadline for trusts and estates to file Form 1041.
Understanding and keeping track of these deadlines is a fundamental part of efficient tax planning. If you find yourself needing assistance or advice in managing your tax obligations, don’t hesitate to reach out to us at Number Nerds. Our dedicated team is ready to help you navigate tax season with ease and confidence.