The 2026 US Sales Tax Filing Calendar

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 and applied to every 2026 filing period per published cadence, with weekend and federal-holiday adjustment to the next business day. Each state's page under the Sales Tax Atlas links its official source and access date. Computed by the same determination engine behind the Prophit.ai Sales Tax Engine. Assigned filing frequencies vary by account — confirm yours with the state.

Cite this data

Free to cite, quote, or embed with attribution: "Prophit.ai 2026 US Sales Tax Filing Calendar, https://prophit.ai/resources/sales-tax-filing-calendar-2026".