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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

File and pay your taxes using our electronic filing service.

Helpful information