An Overview of Washington State Business Income Tax Extension Forms

- Updated February 21, 2022 - 8.00 AM by Admin, ExpressExtension

Does Washington support tax extension for business tax returns?


The state of Washington is one of the states that doesn’t require income taxes from Businesses. But, impose Business and Occupation taxes which are calculated based on the gross income. These taxes are reported on the state’s excise tax return.

An extension can be applied for filing this excise tax return.

What Form does the state of Washington require to apply for an extension?


There is no specific form to request an extension. But, the extension request can be made online through the website

Visit to know how to request an extension for the B&O taxes.

When is the deadline to request an extension with Washington?


Washington State annual B&O tax return is due by the 15th day of the 4th month following the end of the reporting period.

For businesses operating on a calendar year, the deadline is on April 15.

To file an extension for the B&O tax return, apply for an extension through the Department of Revenue website on or before the same date the B&O tax return is due.

The state grants the 30 days extension if the tax due is paid along with the extension request.

How do I pay my balance due along with the extension Form?


You can choose to pay your balance due along with your return by using any one of the following options:

  • Electronic funds transfer - (EFT Debit and EFT Credit)
  • E-Check
  • Credit Card
  • Check

Visit for more information on tax payment options.