Reviewed 2026-09-18. Regular deadlines only; extensions, disaster relief and prepayments need separate checks. The interactive calendar highlights the next reviewed date; the complete reference schedule appears below.
California: Monthly
Last day of the following month, moved to the next business day when needed. Quarterly prepayments are not included.
- August 2026: file by September 30, 2026.
- September 2026: file by November 2, 2026.
- October 2026: file by November 30, 2026.
- November 2026: file by December 31, 2026.
New York: Quarterly
New York sales-tax quarters differ from calendar quarters. Monthly and annual filers have separate schedules.
- June–August 2026: file by September 21, 2026.
- September–November 2026: file by December 21, 2026.
Texas: Monthly
20th of the following month, adjusted for weekends and holidays. Check separate EFT processing cutoffs and prepayment requirements.
- August 2026: file by September 21, 2026.
- September 2026: file by October 20, 2026.
- October 2026: file by November 20, 2026.
- November 2026: file by December 21, 2026.
Washington: Monthly
Combined excise return. Weekend and Christmas adjustments are included; payment-method cutoffs can be earlier.
- August 2026: file by September 25, 2026.
- September 2026: file by October 26, 2026.
- October 2026: file by November 25, 2026.
- November 2026: file by December 28, 2026.
Florida: Monthly
Displayed filing date is the last timely date. Electronic payment must be initiated and confirmed by 5 p.m. Eastern on the separate payment date.
- August 2026: file by September 21, 2026; electronic payment by September 18, 2026, 5 p.m. Eastern.
- September 2026: file by October 20, 2026; electronic payment by October 19, 2026, 5 p.m. Eastern.
- October 2026: file by November 20, 2026; electronic payment by November 19, 2026, 5 p.m. Eastern.
- November 2026: file by December 21, 2026; electronic payment by December 18, 2026, 5 p.m. Eastern.
Illinois: Monthly
ST-1 monthly return, adjusted for weekends and state holidays. Quarter-monthly payments are not included.
- August 2026: file by September 21, 2026.
- September 2026: file by October 20, 2026.
- October 2026: file by November 20, 2026.
- November 2026: file by December 21, 2026.