2026 Excise tax return due dates | Washington Department of Revenue

Important!

Disaster Relief: Revenue will work with businesses that cannot file or pay their taxes on time due to recent wildfire damage or other natural disasters. Learn more about disaster relief.

Ayuda por desastres: El Departamento de Ingresos trabajará con las empresas que no puedan presentar o pagar sus impuestos a tiempo debido a los daños causados por incendios forestales u otros desastres naturales. Conozca más sobre la ayuda en caso de desastre.

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 2026 return

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

February 2026 return

Due date: 03/25/26
9% penalty begins: 03/26/26
19% penalty begins: 05/01/26
29% penalty begins: 06/02/26

March 2026 return

Due date: 04/25/26
9% penalty begins: 04/28/26
19% penalty begins: 06/02/26
29% penalty begins: 07/01/26

April 2026 return

Due date: 05/25/26
9% penalty begins: 05/27/26
19% penalty begins: 07/01/26
29% penalty begins: 08/01/26

May 2026 return

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

June 2026 return

Due date: 07/25/26
9% penalty begins: 07/28/26
19% penalty begins: 09/01/26
29% penalty begins: 10/01/26

July 2026 return

Due date: 08/25/26
9% penalty begins: 08/26/26
19% penalty begins: 10/01/26
29% penalty begins: 11/03/26

August 2026 return

Due date: 09/25/26
9% penalty begins: 09/26/26
19% penalty begins: 11/03/26
29% penalty begins: 12/01/26

September 2026 return

Due date: 10/25/26
9% penalty begins: 10/27/26
19% penalty begins: 12/01/26
29% penalty begins: 01/01/27

October 2026 return

Due date: 11/25/26
9% penalty begins: 11/26/26
19% penalty begins: 01/01/27
29% penalty begins: 02/02/27

November 2026 return

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

December 2026 return

Due date: 01/25/27
9% penalty begins: 01/26/27
19% penalty begins: 03/02/27
29% penalty begins: 04/01/27

Quarterly due dates

Quarter 1, 2026 return

Due date: 04/30/26
9% penalty begins: 05/01/26
19% penalty begins: 06/02/26
29% penalty begins: 07/01/26

Quarter 2, 2026 return

Due date: 07/31/26
9% penalty begins: 08/01/26
19% penalty begins: 09/01/26
29% penalty begins: 10/01/26

Quarter 3, 2026 return

Due date: 10/31/26
9% penalty begins: 11/03/26
19% penalty begins: 12/01/26
29% penalty begins: 01/01/27

Quarter 4, 2026 return

Due date: 01/31/27
9% penalty begins: 02/02/27
19% penalty begins: 03/02/27
29% penalty begins: 04/01/27

Annual 2026 due date

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

Due date: 04/15/27
9% penalty begins: 04/16/27
19% penalty begins: 06/02/27
29% penalty begins: 07/01/27