Seattle Business License Tax Due Dates

The date your taxes are due depends on your reporting status. Your reporting status indicates how often you are required to file taxes and is listed on your business license.

If you do not know your reporting status, contact us.

This video summarizes Seattle business license tax due dates for each reporting status.

You pay a penalty fee for filing taxes after the due date. The penalty fee increases the longer you wait to file.

NOTICE: Effective Aug. 1, 2015, penalty rates for late tax payments are increasing. New rates are reflected in the table below. For more information about the penalty increase, see the “About the penalty increase” section below. In addition to late fees, you must also pay interest if you file late. Interest accrues from the due date until the date paid.

The interest due is equal to:

(interest rate / 360) x (tax owed amount) x (number of days late)

You will not be charged a late fee or interest if you do not owe any tax. But you must still file a tax return.

About the penalty increase

A mandatory change under Senate Bill 6138 requires municipalities to adopt increased penalty rates. Second quarter 2015 tax returns mailed out in late June reflect the old penalty rates. If a business pays an old penalty rate, we will mail a notice for the additional amount due.