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Staying on top of important tax deadlines can help you avoid unnecessary penalties, interest, and last-minute stress. Below are key federal tax deadlines for the 2026 tax filing season. Please note that tax deadlines may change, and this page will be updated annually.
The information provided is for general informational purposes only and is subject to change based on IRS and state agency guidance. Please consult a tax professional regarding your specific situation.
April 15, 2026
Deadline for most taxpayers to file their 2025 Form 1040 and pay any federal income tax due. An extension provides additional time to file and not additional time to pay.
October 15, 2026
Deadline for most individual taxpayers who timely requested an extension to file their 2025 federal income tax return. Any 2025 tax owed was still generally due April 15.
April 15, 2026
1st Quarter Estimated Payment Due
June 15, 2026
2nd Quarter Estimated Payment Due
September 15, 2026
3rd Quarter Estimated Payment Due
January 15, 2027
4th Quarter Estimated Payment Due
February 2, 2026
Employers must provide Forms W-2 to employees. Additionally, the deadline to issue and file Forms 1099-NEC falls on this date.
March 16, 2026
Deadline for calendar-year partnerships and S corporations to file their 2025 federal tax returns or request an extension. March 15 falls on a Sunday in 2026, so the deadline moves to March 16.
April 15, 2026
On April 15, the IRS deadlines specify when C Corporation Returns (Form 1120) are due, and it is also the deadline to request a corporate extension for filing.
June 15, 2026
This date is significant as it is the deadline to make the required PTET prepayment for the tax year 2026.
September 15, 2026
The extended deadline for Partnership and S Corporation returns.
October 15, 2026
This date marks the extended deadline for C Corporation returns.
March 15, 2027
By this date, the remaining PTET balance is due along with the entity's California tax return.
Meeting tax deadlines is important, but planning ahead can help reduce penalties, avoid surprises, and identify tax-saving opportunities before it's too late.