2026 IRS Tax Deadlines & Important Dates
All key IRS deadlines for 2026 — filing your 2025 return (April 15), quarterly estimated tax payments for the 2026 tax year (April 15 / June 15 / September 15 / January 15, 2027), the October 15 extension deadline, plus IRA and 401(k) contribution deadlines.
Q4 2025 Estimated Tax Payment Due
Fourth quarter estimated tax payment for the 2025 tax year is due.
W-2 and 1099 Forms Due to Employees/Contractors
Employers must send W-2 forms and businesses must send 1099-NEC forms by this date.
2025 Tax Return Filing Deadline
Deadline to file your 2025 federal income tax return or request a six-month automatic extension. Any taxes owed are still due by April 15.
Q1 2026 Estimated Tax Payment Due
First quarter estimated tax payment for the 2026 tax year is due.
2025 IRA Contribution Deadline
Last day to make Traditional or Roth IRA contributions that count toward the 2025 tax year.
Q2 2026 Estimated Tax Payment Due
Second quarter estimated tax payment for the 2026 tax year is due.
Tax Return Deadline for US Citizens Abroad
Automatic two-month extended filing deadline for US citizens and resident aliens living outside the US (2025 returns).
Q3 2026 Estimated Tax Payment Due
Third quarter estimated tax payment for the 2026 tax year is due.
Extended Tax Return Filing Deadline
Deadline for filing your 2025 federal tax return if you requested an extension by April 15, 2026.
401(k) Contribution Deadline
Last day to make 401(k) employee contributions for the 2026 tax year. The 2026 limit is $24,500 ($32,500 if age 50+).
Q4 2026 Estimated Tax Payment Due
Fourth quarter estimated tax payment for the 2026 tax year is due.
Frequently asked questions
When is the tax filing deadline for 2025 returns?
The deadline to file your 2025 federal income tax return is April 15, 2026. You can request an automatic six-month extension, which moves the filing deadline to October 15, 2026. However, any taxes owed are still due by April 15, 2026.
When are estimated tax payments due in 2026?
Estimated tax payments for the 2026 tax year are due quarterly: Q1 on April 15, 2026, Q2 on June 15, 2026, Q3 on September 15, 2026, and Q4 on January 15, 2027.
What is the deadline for IRA contributions?
The deadline for IRA contributions for the 2025 tax year is April 15, 2026. This applies to both Traditional and Roth IRA contributions.