2020 Excise tax return due dates | Washington Department of Revenue

Sales tax now applies to some services

Starting October 1: Some business services are now subject to retail sales tax, as required by state law, ESSB 5814. When you buy these services, vendors should add sales tax to your bill. If you sell these services, you should begin collecting retail sales tax. Learn more about Services newly subject to retail sales tax.

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 return

Due date: 02/25/20
9% penalty begins: 02/26/20
19% penalty begins: 04/01/20
29% penalty begins: 05/01/20

February return

Due date: 03/25/20
9% penalty begins: 03/26/20
19% penalty begins: 05/01/20
29% penalty begins: 06/02/20

March return

Due date: 04/27/20
9% penalty begins: 04/28/20
19% penalty begins: 06/02/20
29% penalty begins: 07/01/20

April return

Due date: 05/26/20
9% penalty begins: 05/27/20
19% penalty begins: 07/01/20
29% penalty begins: 08/01/20

May return

Due date: 06/25/20
9% penalty begins: 06/26/20
19% penalty begins: 08/01/20
29% penalty begins: 09/01/20

June return

Due date: 07/27/20
9% penalty begins: 07/28/20
19% penalty begins: 09/01/20
29% penalty begins: 10/01/20

July return

Due date: 08/25/20
9% penalty begins: 08/26/20
19% penalty begins: 10/01/20
29% penalty begins: 11/03/20

August return

Due date: 10/02/20
9% penalty begins: 10/03/20
19% penalty begins: 12/01/20
29% penalty begins: 01/01/21

September return

Due date: 10/26/20
9% penalty begins: 10/27/20
19% penalty begins: 12/01/20
29% penalty begins: 01/01/21

October return

Due date: 11/25/20
9% penalty begins: 11/26/20
19% penalty begins: 01/01/21
29% penalty begins: 02/02/21

November return

Due date: 12/28/20
9% penalty begins: 12/29/20
19% penalty begins: 02/02/21
29% penalty begins: 03/02/21

December return

Due date: 01/25/21
9% penalty begins: 01/26/21
19% penalty begins: 03/02/21
29% penalty begins: 04/01/21

Quarterly due dates

Quarter 1, 2020 return

Due date: 06/30/20
9% penalty begins: 07/01/20
19% penalty begins: 08/01/20
29% penalty begins: 09/01/20

Quarter 2, 2020 return

Due date: 07/31/20
9% penalty begins: 08/01/20
19% penalty begins: 09/01/20
29% penalty begins: 10/01/20

Quarter 3, 2020 return

Due date: 11/02/20
9% penalty begins: 11/03/20
19% penalty begins: 12/01/20
29% penalty begins: 01/01/21

Quarter 4, 2020 return

Due date: 02/01/21
9% penalty begins: 02/02/21
19% penalty begins: 03/02/21
29% penalty begins: 04/01/21

Annual 2020 due date

Starting with the 2020 annual tax return, you must file and pay electronically.

If you are unable to file electronically, you may request a waiver.

Due date: 04/15/21
9% penalty begins: 04/16/21
19% penalty begins: 06/02/21
29% penalty begins: 07/01/21

Looking for the due date for the 2019 Annual return? Learn more.