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