# Business Tax Deadlines

> Federal and state business tax deadlines, computed from the statutory rules and checked against each state revenue department.

Federal filing and payment dates (Form 1040, 1120, 1120-S, 1065, quarterly estimated tax, Form 941, Form 940, W-2 and 1099-NEC) are computed at build time from IRS Publication 509 rules with weekend and federal-holiday roll-forward under 26 U.S.C. 7503. State-level corporate, pass-through, and sales tax filing information covers all 50 states and DC; every state entry was checked against its revenue department (verification pass dated 2026-09-01) and cites the pages it was read from. IRS disaster relief postponements are parsed daily from the IRS index of relief releases.

## Key facts

- Next federal deadline: Q3 2026 estimated tax payment (Form 1040-ES), September 15, 2026.
- 2026 federal calendar: 32 deadlines.
- Quarterly estimated tax: April 15, June 15, September 15, January 15 (next year).
- Partnership / S-corp returns: March 15. C-corp / individual: April 15.
- IRS disaster relief: 17 postponements active as of 2026-09-02 (see /disaster-relief/).

## Pages

- https://businesstaxdeadlines.com/
- https://businesstaxdeadlines.com/calendar/
- https://businesstaxdeadlines.com/calendar/2026/
- https://businesstaxdeadlines.com/calendar/2027/
- https://businesstaxdeadlines.com/deadlines/
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- https://businesstaxdeadlines.com/deadlines/nc/
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- https://businesstaxdeadlines.com/deadlines/nj/
- https://businesstaxdeadlines.com/deadlines/nm/
- https://businesstaxdeadlines.com/deadlines/nv/
- https://businesstaxdeadlines.com/deadlines/ny/
- https://businesstaxdeadlines.com/deadlines/oh/
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- https://businesstaxdeadlines.com/deadlines/or/
- https://businesstaxdeadlines.com/deadlines/pa/
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- https://businesstaxdeadlines.com/deadlines/sc/
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- https://businesstaxdeadlines.com/deadlines/wv/
- https://businesstaxdeadlines.com/deadlines/wy/
- https://businesstaxdeadlines.com/entity-type/
- https://businesstaxdeadlines.com/entity-type/sole-proprietor/
- https://businesstaxdeadlines.com/entity-type/single-member-llc/
- https://businesstaxdeadlines.com/entity-type/partnership/
- https://businesstaxdeadlines.com/entity-type/s-corporation/
- https://businesstaxdeadlines.com/entity-type/c-corporation/
- https://businesstaxdeadlines.com/entity-type/nonprofit/
- https://businesstaxdeadlines.com/quarterly-estimated-taxes/
- https://businesstaxdeadlines.com/w2-1099-deadlines/
- https://businesstaxdeadlines.com/form-941-payroll/
- https://businesstaxdeadlines.com/tax-extension-deadlines/
- https://businesstaxdeadlines.com/calculators/next-deadline/
- https://businesstaxdeadlines.com/disaster-relief/
- https://businesstaxdeadlines.com/data/
- https://businesstaxdeadlines.com/about/

## Data downloads (stable URLs, rebuilt daily)

- https://businesstaxdeadlines.com/data/federal-deadlines-2026.csv - Every federal tax deadline for 2026 (date, category, description).
- https://businesstaxdeadlines.com/data/federal-deadlines-2027.csv - Every federal tax deadline for 2027 (date, category, description).
- https://businesstaxdeadlines.com/data/state-tax-deadlines.csv - State business tax filing table for all 50 states and DC: corporate, pass-through and sales tax dates, other business taxes, checked date, and source URLs.
- https://businesstaxdeadlines.com/data/irs-disaster-relief.csv - Every release in the IRS disaster relief index with the parsed postponed date, state, and event; year_inferred marks dates whose year came from the release year.