Washington Sales Tax Due Dates — 2026
Exact Washington sales tax filing deadlines for 2026 and 2027 — every period, already adjusted for weekends and holidays. Find your filing frequency, see the dates, and add them to your calendar.
Washington Monthly Sales Tax Due Dates — 2026
| Filing period | Due date |
|---|---|
| December 2025 | Mon, January 26, 2026moved off weekend/holiday |
| January 2026 | Wed, February 25, 2026 |
| February 2026 | Wed, March 25, 2026 |
| March 2026 | Mon, April 27, 2026moved off weekend/holiday |
| April 2026 | Tue, May 26, 2026moved off weekend/holiday |
| May 2026 | Thu, June 25, 2026 |
| June 2026 | Mon, July 27, 2026moved off weekend/holiday |
| July 2026 | Tue, August 25, 2026 |
| August 2026 | Fri, September 25, 2026 |
| September 2026 | Mon, October 26, 2026moved off weekend/holiday |
| October 2026 | Wed, November 25, 2026 |
| November 2026 | Mon, December 28, 2026moved off weekend/holiday |
Dates are adjusted for weekends and U.S. federal holidays. Some states observe additional state holidays — always confirm the exact date with the Washington Department of Revenue.
How Washington assigns your filing frequency
Your frequency is based on how much sales tax you collect. Washington Department of Revenue notifies you of your assigned schedule.
Monthly
Larger businesses (assigned by DOR); due the 25th of the following month.
Quarterly
Mid-size businesses; due the end of the month after the quarter.
Annual
Small businesses; the annual return is due April 15 of the following year.
Washington sales tax filing rules
Good to know
Monthly/quarterly returns are due the 25th; the annual return is due April 15.
Filing Washington sales tax late
Washington charges a late-filing and late-payment penalty plus interest on any unpaid tax, and most states apply a minimum penalty even on a zero return. File on time — even a return with no tax due must be filed. Confirm current penalty amounts with the Washington Department of Revenue.
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Frequently Asked Questions
Official sources
Last verified 2026-05-30 against state revenue references. This page is for general information, not tax advice — confirm your specific due dates with the Washington Department of Revenue.
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