Tax Deadline Calendar
Key filing and payment deadlines for the 2025 tax year (filed in 2026) and 2026 estimated tax payments (for tax year 2026, filed in 2027). Dates reflect standard IRS due dates — extensions may apply.
March 2026
Partnerships & S-Corps — Original Due
Original deadline for partnership and S-corporation returns.
April 2026
Individual Returns — Original Due
Original deadline for individual income tax returns.
C-Corporation Returns — Original Due
Original deadline for C-corporation income tax returns.
Q1 Estimated Tax Payment
First quarter estimated tax payment due for individuals and corporations.
June 2026
Q2 Estimated Tax Payment
Second quarter estimated tax payment due.
September 2026
Partnerships & S-Corps — Extension Due
Final extension deadline for partnership and S-corporation returns.
Q3 Estimated Tax Payment
Third quarter estimated tax payment due.
October 2026
Individual Returns — Extension Due
Final extension deadline for individual income tax returns.
C-Corporation Returns — Extension Due
Final extension deadline for C-corporation returns.
January 2027
Q4 Estimated Tax Payment
Fourth quarter estimated tax payment due.
Disclaimer: Filing and extension deadlines shown are for the 2025 tax year (returns filed in 2026). Estimated tax payments are for the 2026 tax year (filed in 2027). Actual due dates may shift when they fall on a weekend or federal holiday. Always confirm with your tax professional.