Congratulations on starting a business in Washington State.

After filing a Business License Application to register your business, 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.

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

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

Helpful information

• 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.
• 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.

More information

Small Business Guide Washington State

How to get licensed (Business Licensing Guide)

Attend a workshop in your area

Request a visit from a tax consultant

Watch an online workshop or tutorial

Forms and publications

Business License Application (pdf)