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Tax Deadline Calendar 2026

10 critical deadlines. Estimated taxes, filing dates, extensions, and year-end planning — all in one place.

January

15
Q4 Estimated Tax Payment Due
Self-employed, freelancers, business owners
Form 1040-ES
31
W-2 and 1099-NEC Filing Deadline
Employers, businesses that paid contractors
W-2, 1099-NEC

March

15
S-Corp and Partnership Tax Return Due
S-Corporations, Partnerships, LLCs (multi-member)
Form 1120-S, Form 1065

April

15
Personal Tax & Q1 Estimated Tax Due
Everyone — individuals, sole proprietors, single-member LLCs
Form 1040, 1040-ES, Form 4868
15
C-Corporation Tax Return Due
C-Corporations (calendar year)
Form 1120
18, 2026
Tax Day 2026 (Extended)
Everyone
Various

June

15
Q2 Estimated Tax Payment Due
Self-employed, freelancers, business owners
Form 1040-ES

September

15
Extended S-Corp/Partnership & Q3 Tax
S-Corps, Partnerships on extension; self-employed
Form 1120-S, 1065, 1040-ES

October

15
Extended Personal & C-Corp Returns Due
Individuals and C-Corps who filed extensions
Form 1040, Form 1120

December

31
Year-End Tax Planning Deadline
Everyone — individuals and businesses
Various

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