US Tax Deadlines 2026

Key IRS filing dates for individuals, businesses, NRIs, and expats. Never miss a deadline — penalties can be up to 25% of unpaid taxes.

Tue, September 15, 2026

S-Corp & Partnership Extended Returns Due

Business S-Corps & Partnerships that filed extensions

Extended deadline for S-Corp (1120-S) and Partnership (1065) returns.

Tue, September 15, 2026

Q3 Estimated Tax Payment

Estimated Tax Self-employed & estimated tax filers

Third quarterly estimated tax payment for tax year 2026. Use Form 1040-ES.

Thu, October 15, 2026

Extended Individual Return Due

Extension Taxpayers who filed Form 4868

Final deadline for extended individual returns for tax year 2025. No further extensions available.

Thu, October 15, 2026

Extended C-Corp Return Due

Business C-Corps that filed Form 7004

Final deadline for extended C-Corp returns.

Thu, October 15, 2026

FBAR Final Deadline

FBAR / FATCA FBAR filers who missed April 15

Absolute final deadline for FinCEN Form 114. No further extensions.

Penalty for late filing

The IRS charges 5% of unpaid taxes per month for late filing (up to 25%) and 0.5% per month for late payment. Filing on time — even without full payment — significantly reduces penalties.

Don't Wait Until the Last Day

Our IRS-authorized tax specialists and Enrolled Agents can file your return accurately and on time. Get started today.

Get Free Estimate