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.
Watch a video to help plan for your business taxes.
Tax classifications are based on what type of business you conduct. Check our classification definitions to see which one(s) your business falls under.
See our list of the most common business activities, the tax classifications they fall under, and other helpful information.
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.