The 2026 US Sales Tax Filing Calendar

Every state's 2026 sales tax due dates

The table shows each state's published filing cadences and the monthly-filer due date rule. Every state links to its full calendar — monthly, quarterly, semi-annual, and annual periods, already moved to the next business day when a deadline lands on a weekend or federal holiday.

No statewide sales-tax return exists in Alaska, Delaware, Montana, New Hampshire, or Oregon — see the no-state-return guides for what that does and does not mean.

The 199 deadlines that moved in 2026

When a statutory due date lands on a weekend or federal holiday, the deadline moves to the next business day. Most published calendars miss these. Every shifted 2026 deadline:

What the 2026 calendar shows

• 29 of the 46 filer states make monthly returns due on the 20th of the following month; 7 use the last day of the following month; the rest use the 15th, 23rd, 25th, or a state-specific date.
• 199 of the 773 published 2026 due dates (26%) shift to the next business day because the statutory date lands on a weekend or federal holiday — the dates most static calendars get wrong.
• June, September, and December are the heaviest shift months in 2026: the 20th falls on a Saturday or Sunday, moving monthly deadlines in every 20th-of-month state at once.
• Five states — Alaska, Delaware, Montana, New Hampshire, and Oregon — have no statewide sales-tax return at all, though Alaska local filings exist through ARSSTC.
• Cadence menus differ: most states publish monthly, quarterly, and annual schedules, a dozen add semi-annual, and the state assigns each account its frequency — a calendar is only as correct as the cadence you are assigned.

Methodology

Due dates are computed from each state's published deadline rule, transcribed from official state sources (departments of revenue due-date pages) and applied to every 2026 filing period per published cadence, with weekend and federal-holiday adjustment to the next business day. The same rule set powers the Prophit.ai filing workspace and the per-state guides; each state's page links its official source and access date. Assigned filing frequencies vary by account — confirm yours with the state before relying on any calendar.

Data: CSV · ICS · per-state pages under the Sales Tax Atlas. Computed by the same determination engine behind the Prophit.ai Sales Tax Engine.