Licenses & Taxes



City of Mercer Island Business License

City of Mercer Island Business License Information
Business License Questions: 206-236-5300

After procuring a State of Washington Master Business License, business owners may apply for a City of Mercer Island License as follows:

Businesses may apply for a Mercer Island Business license online

  1. Submit the completed form along with a check in the amount of $30.00 made payable to City of Mercer Island.
  2. Mail both application and fee to:

    City of Mercer Island
    9611 SE 36th Street
    Mercer Island, WA 98040-3732

City of Mercer Island B&O Tax

City of Mercer Island tax information

The City of Mercer Island collects a Business and Occupation tax from all active Business License holders with gross revenue in excess of $150,000 per calendar year. The first $150,000 of revenue per year is exempt from tax. Revenue of $150,001 and above are taxed at a rate of .0010 with a $20.00 minimum payment.