05/22/2026
Washington business owners, let's talk about the mistake that triggers an automatic penalty.
If you are set up on a monthly filing frequency with the Washington DOR, your excise tax return and payment are due by the 25th of every single month. Missing that deadline by even one day unlocks an immediate penalty, and it grows the longer it sits unpaid.
To file, you must use the online My DOR portal to report your gross revenue, calculate your B&O classifications, and remit any collected sales tax.
Don't waste your hard-earned money on avoidable state penalties.
Contact us for help.