To register your business, use the My DOR online business licensing system. After you’ve filed your application, you will receive a business license and Unified Business Identifier (UBI) number from the Business Licensing Service.
You will also receive a letter from the Department of Revenue with your UBI/tax registration number and filing frequency.
To learn more about doing business in Washington, visit Washington BusinessHub.
Filing tax returns
All monthly and quarterly filers must file and pay their excise taxes electronically. For more information, visit our mandatory e-file page.
For taxpayers who are not required to file and pay electronically:
- Pre-printed returns are mailed about four weeks 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 Tax Registration Number 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
File and pay your taxes using our electronic filing service.
- New business tax basics (pdf) - Overview of Washington's business taxes and reporting requirements.
- New business tax workshop - Learn the basics of Washington State taxes and your tax reporting responsibilities.
- Industry specific guides - To help you better understand the tax obligations for specific industries.
- Nonprofit organizations - See special exemptions that may apply to your business.
- Out-of-state businesses - Learn about your Washington State tax liability.
- Active non-reporting - If you qualify, conduct business without filing tax returns.
- Tax consultation service - Request a representative to visit your office and explain how state taxes apply to your business.