IMPORTANT TAX DEADLINES
2026 Deadlines
January 2026
2025 Tax Season Begins
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January 15, 2026
4th Quarter 2025 estimated quarterly tax payments are due
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January 31, 2026
W-2 & 1099 Filings
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Deadline to distribute annual forms W-2 and 1099-MISC to employees and independent contractors who worked for you in 2025.
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March 16, 2026
Corporate Tax Return Deadline
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Tax returns for partnerships and S-corporations are due
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April 15, 2026
1st Quarter estimated quarterly tax payments are due
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April 15, 2026
C-corporations and Sole Proprietors Tax Return Deadline
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Tax returns for C-corporations and sole proprietors are due
Individual Tax Return Deadline
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Tax returns for individuals are due
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April 15, 2026
Non-profit income tax return extension due date​
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June 16, 2026
2nd Quarter estimated quarterly tax payments are due
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July 31, 2026
Form 5500 filing and audit for 401(k) audits
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Deadline for filing extension to October 15 for form 5500
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September 15, 2026
3rd Quarter estimated quarterly tax payments are due
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Partnership and multi-member LLC business tax extension deadline
Extended Corporate Tax Return Deadline
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S corporation business tax extension deadline
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October 15, 2026
Extended Corporate Tax Return Deadline
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Extended deadline for C-corporations and and sole proprietorship to file tax returns
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November 16, 2026
Extended Non-for-Profit Organizations Tax Return Deadline
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Extended deadline for tax-exempt organizations to file tax returns