Alert: Quarterly tax filings and payments were due July 31. Next quarterly filings and payments due Oct. 31. See due dates and late fees. 

Business license tax certificates and tax returns

If you do business in Seattle, you must:

You can manage your business license and tax needs online, including applying for and renewing your business license tax certificate, filing your business tax return and paying your taxes.

Regulatory endorsements

The City of Seattle regulates several types of businesses including taxis, short-term rentals, adult entertainment, marijuana businesses, towing companies and others. Regulated businesses require both a standard business license tax certificate and a regulatory endorsement added to the license tax certificate. For more information, see businesses that require a regulatory endorsement.

Supporting business in Seattle

In addition to the information on these pages, the Office of Economic Development's small business team offers helpful resources to small businesses in Seattle.

Resources — tax laws and rule-making process

License and Tax Administration (LTA) is part of the Department of Finance and Administrative Services (FAS) and follows FAS' rule-making process. Learn more about the rule-making process on FAS' director's rules site.

City tax laws
City tax rules

Contact us

License and tax administration
(206) 684-8484

Open Monday through Friday, 8:30 a.m.-4 p.m.

Mailing address
P.O. Box 34214
Seattle, WA 98124-4214