2025 Excise tax return due dates | Washington Department of Revenue

Read the information below to find out when your tax return is due. If the due date falls on a weekend or legal holiday, the due date is extended to the next business day.

Monthly Quarterly Annual

Monthly due dates

January 2025 return

Due date: 02/25/25
9% penalty begins: 02/26/25
19% penalty begins: 04/01/25
29% penalty begins: 05/01/25

February 2025 return

Due date: 03/25/25
9% penalty begins: 03/26/25
19% penalty begins: 05/01/25
29% penalty begins: 06/03/25

March 2025 return

Due date: 04/25/25
9% penalty begins: 04/26/25
19% penalty begins: 06/03/25
29% penalty begins: 07/01/25

April 2025 return

Due date: 05/25/25
9% penalty begins: 05/28/25
19% penalty begins: 07/01/25
29% penalty begins: 08/01/25

May 2025 return

Due date: 06/25/25
9% penalty begins: 06/26/25
19% penalty begins: 08/01/25
29% penalty begins: 09/03/25

June 2025 return

Due date: 07/25/25
9% penalty begins: 07/26/25
19% penalty begins: 09/03/25
29% penalty begins: 10/01/25

July 2025 return

Due date: 08/25/25
9% penalty begins: 08/26/25
19% penalty begins: 10/01/25
29% penalty begins: 11/01/25

August 2025 return

Due date: 09/25/25
9% penalty begins: 09/26/25
19% penalty begins: 11/01/25
29% penalty begins: 12/02/25

September 2025 return

Due date: 10/25/25
9% penalty begins: 10/28/25
19% penalty begins: 12/02/25
29% penalty begins: 01/01/26

October 2025 return

Due date: 11/25/25
9% penalty begins: 11/26/25
19% penalty begins: 01/01/26
29% penalty begins: 02/03/26

November 2025 return

Due date: 12/25/25
9% penalty begins: 12/27/25
19% penalty begins: 02/03/26
29% penalty begins: 03/03/26

December 2025 return

Due date: 01/25/26
9% penalty begins: 01/27/26
19% penalty begins: 03/03/26
29% penalty begins: 04/01/26

Quarterly due dates

Quarter 1, 2025 return

Due date: 04/30/25
9% penalty begins: 05/01/25
19% penalty begins: 06/03/25
29% penalty begins: 07/01/25

Quarter 2, 2025 return

Due date: 07/31/25
9% penalty begins: 08/01/25
19% penalty begins: 09/03/25
29% penalty begins: 10/01/25

Quarter 3, 2025 return

Due date: 10/31/25
9% penalty begins: 11/01/25
19% penalty begins: 12/02/25
29% penalty begins: 01/01/26

Quarter 4, 2025 return

Due date: 01/31/26
9% penalty begins: 02/03/26
19% penalty begins: 03/03/26
29% penalty begins: 04/01/26

Annual 2025 due date

Annual due dates are listed below for the Combined Excise Tax Return.

Due date: 04/15/26
9% penalty begins: 04/16/26
19% penalty begins: 06/02/26
29% penalty begins: 07/01/26