Jan. 15, 2026
4th Quarter 2025 Estimated Tax Payment Due
March 15, 2026 is the filing and/or extension deadline for the following:
Form 1120S – 2025 U.S. Income Tax Return for an S Corporation
Form 1065 – 2025 U.S. Return of Partnership Income
April 15, 2026 is the filing and/or extension deadline for the following:
Form 1040 – 2025 U.S. Individual Income Tax Return
Form 1120 – 2025 U.S. Corporation Income Tax Return
Form 1041 – 2025 U.S. Income Tax Return for Estates and Trusts
1st Quarter 2026 Estimated Tax Payment Due
June 15, 2026
2nd Quarter 2026 Estimated Tax Payment Due
September 15, 2026
Extended S Corporation and Partnership Tax Returns Due
3rd Quarter 2026 Estimated Tax Payment Due
September 30, 2026
Extended Estates and Trust Tax Returns Due
October 15, 2026
Extended Individual Tax Returns Due
January 15, 2027
4th Quarter 2026 Estimated Tax Payment Due
Note that these deadlines may vary if they fall on a weekend or holiday, in which case the due date is typically pushed to the next business day.
Please reach out to your Brown CPA Group professional team with any questions at (847)509-4100.