Tax Due Dates.

June 2026

  • June 15 – Q2 estimated tax payment due (individuals & corporations)

  • June 15 – US citizens/residents living abroad: deadline to file 2025 federal income tax return (automatic 2-month extension)

July 2026

  • July 31 – Employer quarterly federal tax return (Form 941) for Q2

September 2026

  • September 15 – Q3 estimated tax payment due (individuals & corporations)

  • September 15 – Extended deadline for S-corps and partnerships (Forms 1120-S, 1065) that filed for a 6-month extension in March

October 2026

  • October 15 – Extended deadline for individual federal income tax returns (Form 1040) that received an extension in April

  • October 15 – Extended deadline for C-corps (Form 1120) with a calendar year end

  • October 31 – Employer quarterly federal tax return (Form 941) for Q3

December 2026

  • December 15 – Q4 estimated tax payment for corporations (calendar-year C-corps)

  • December 31 – Last day to make charitable contributions deductible for 2026; last day for required minimum distributions (RMDs); last day to maximize 401(k) elective deferrals for the year

Close-up of a wall calendar with a pencil pointing to the date of the 31st, showing days in black, red, and blue, with the month starting with Thursday.