Congratulations on starting a business in Washington State.

After filing a Master Business Application to register your business, you will receive a business license and Unified Business Identifier (UBI) number from the Department of Licensing.

You will also receive a packet of information for new businesses from the Department of Revenue.

Visit Access Washington® to learn about Doing Business in Washington.

Also check out our online Business Outreach Video Workshop  

Filing tax returns

• 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.

What you'll receive in your packet:

• A Welcome letter with your:
  - UBI/tax registration number
  - filing frequency
• Business Tax Guide (pdf)

Helpful information

• Nonprofit organizations (pdf) (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)