Estimated Tax Payments (For Self-Employed, LLCs, S Corps, etc.)

April 15, 2025 – 1st Quarter Estimated Tax Payment Due

June 16, 2025 – 2nd Quarter Estimated Tax Payment Due

September 15, 2025 – 3rd Quarter Estimated Tax Payment Due

January 15, 2026 – 4th Quarter Estimated Tax Payment Due

Business Tax Return Filing Deadlines

Partnerships & Multi-Member LLCs: March 15, 2026 – File IRS Form 1065

S Corporations: March 16, 2026 – File IRS Form 1120S

C Corporations: April 15, 2026 – File IRS Form 1120 

Individual & Sole Proprietor Tax Returns

April 15, 2026 – File IRS Form 1040 with Schedule C 

Tax Filing Extension Deadlines

October 15, 2026 – Final deadline for extended tax filings (if Form 4868 was submitted by April 15, 2026)

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