Plan for taxes

Filing tax returns

Once you have registered your business you will receive a letter from the Department of Revenue with your UBI/account ID number and filing frequency.

You must file and pay excise taxes electronically. For more information, visit our mandatory e-file page.

Businesses who have received a waiver from the mandatory e-file/e-payment requirement

If your business has received a waiver, keep in mind:

  • Pre-printed returns will be mailed before the due date.
  • The due date is printed on your tax return.
  • You are required to file and pay taxes by the due date even if you do not receive a tax return.
  • If the due date falls on a weekend or legal holiday, the due date for the return is the next business day.
  • Your nine-digit Account ID is printed above your name and address on the tax return. Write this number on:
    • the deduction detail pages (if reporting deductions on your tax return)
    • any related forms
    • your check

The easiest way to file and pay your taxes is online using My DOR.

Business Tax Basics workshop

Attend a free workshop to learn about your tax reporting responsibilities. 

Tax classifications

Tax classifications are based on what type of business you conduct. Check our classification definitions to see which one(s) your business falls under.

Tax classifications for common business activities

See our list of the most common business activities, the tax classifications they fall under, and other helpful information.

Sales tax rates

Use our Tax Rate Lookup Tool to find tax rates for any location in Washington. Search by address or use the map to find the rate for a specific location.

Register and pay back taxes

If you have been doing business in Washington and are not registered with the Department of Revenue, you can come forward voluntarily under the Voluntary Disclosure Program.