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Tax Deadlines Calendar
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2026 Tax Calendar
January 15, 2026
Fourth Quarter 2025 Estimated Tax Payment
Applies to self-employed individuals and those with income not subject to withholding. Payment covers income earned from September 1 through December 31, 2025.
March 16, 2026
S Corporation & Partnership Tax Returns
Form 1120-S (S Corps) and Form 1065 (Partnerships) must be filed for 2025 tax year. Six-month extension available by filing Form 7004 by this deadline.
April 15, 2026
Individual Income Tax Returns & First Quarter 2026 Estimated Tax
Form 1040 deadline for 2025 tax year for most taxpayers. Also due: First quarter 2026 estimated tax payment and IRA contributions for 2025 tax year. Extension requests (Form 4868) must be filed by this date.
June 15, 2026
Second Quarter 2026 Estimated Tax Payment
Payment covers income earned from April 1 through May 31, 2026. Self-employed individuals and those with non-withheld income must pay using Form 1040-ES.
September 15, 2026
Third Quarter 2026 Estimated Tax Payment
Payment covers income earned from June 1 through August 31, 2026. Required for those with significant non-wage income. Review year-to-date income and adjust payment if necessary.
October 15, 2026
Extended Individual Tax Return Deadline
Final deadline for filing 2025 Form 1040 if you filed for an extension by April 15, 2026. No further extensions available beyond this date.
January 15, 2027
Fourth Quarter 2026 Estimated Tax Payment
Payment covers income earned from September 1 through December 31, 2026. Final estimated tax payment for the 2026 tax year.