October 15
- Extended deadline for C corporation and individual returns
October 30
- Quarterly estimated tax payments

October 15
October 30
Deadline for employees who received $20 or more in tips during August to report them to their employers using Form 4070.
September 15, 2026
Q3 Estimated Tax Payment Due: Third-quarter estimated tax payments for 2026 (Form 1040-ES) are due for self-employed individuals and gig workers.
Extended Partnership & S-Corp Returns: Final deadline to file extended income tax returns for calendar-year partnerships (Form 1065) and S-corporations (Form 1120-S).
Employer Payroll Deposits: Deposit Social Security, Medicare, and withheld income taxes for August if the monthly deposit rule applies.
September 30, 2026
Extended due date for Form 1041 (Income Tax Return for Estates and Trusts).
May 1, 2026 (Disaster Relief Deadline): Affected taxpayers in specific areas have this date for 2025 IRA/HSA contributions, Q1 2026 estimated taxes, and first-quarter payroll/excise taxes.
May 15, 2026 (Monthly Employer Deposits): Employers must deposit Social Security, Medicare, and withheld income tax for April 2026.
May 15, 2026 (Non-profit): Calendar year non-profits (Form 990) must file or request an extension.
May 31, 2026 (Payroll Taxes): First-quarter 2026 payroll tax returns (Form 941) are due, if not filed in April, for those who deposited in full.
Monthly Deposits: Semi-weekly depositors must deposit payroll taxes for specific dates throughout the month.
Important Reminders:
Extensions: While individual income tax filing extensions are due on October 15, 2026, any tax owed was due on April 15, 2026.
Disaster Relief: Some taxpayers may have deadlines postponed by the IRS.
Stay Compliant: Employers should ensure timely monthly deposits to avoid penalties.
April 15
March 16 (March 15 is Sunday)
March 31
February 2
February 28 (Saturday → Due Monday, March 2, 2026)
January 15
January 31 (Saturday → Due Monday, February 2, 2026)