If your business started billing for a service last October and never checked whether the state’s sales tax rules had changed underneath you, Washington’s Department of Revenue is offering a narrow window to fix it without a penalty — but the clock is already running.
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What happened
As of October 1, 2025, certain services became newly subject to Washington retail sales tax under ESSB 5814. The state’s Department of Revenue is now running a temporary penalty relief program: businesses that voluntarily report and pay retail sales tax and use tax they owe as a result of that change can get penalties waived for reporting periods from October 1, 2025 through December 31, 2026, according to the DOR’s official announcement.
Importantly, this is a penalty waiver only. The underlying tax owed, plus any applicable interest, still has to be paid. Evasion, negligence, and tax avoidance penalties don’t qualify for relief under this program — it’s aimed at businesses that missed the change in good faith, not ones that knowingly skipped collecting, per Tri-Cities Area Journal of Business.
Why it matters
Sales tax base expansions like this one are easy to miss, especially for service-based businesses that have never had to think about sales tax before and don’t have a system automatically flagging law changes. The DOR’s relief program is effectively an admission that a lot of businesses didn’t catch the October 2025 change in real time — and a one-time opportunity to come into compliance before the state applies late-payment penalties on top of back taxes.
What this means for small business owners
- Applications for penalty relief must be submitted by September 30, 2027 — through the DOR’s online Voluntary Disclosure Application, selecting “yes” on the ESSB 5814 penalty relief question. Businesses that aren’t currently registered with the state should look at the Voluntary Disclosure Program more broadly.
- Review whether any service you sell became newly taxable on October 1, 2025. If you’re a construction, HVAC, or general service business — CentsIQ’s core client base — this is exactly the kind of quiet reclassification that slips through if your bookkeeping wasn’t specifically flagged to watch for it.
- The math still hurts even with penalties waived. Back tax plus interest on nine-plus months of unbilled sales tax can be a real number. The earlier you self-report, the smaller that interest bill gets — waiting until the 2027 deadline only makes it worse.
- This is a bookkeeping review, not a DIY project. Determining whether your specific services were affected by ESSB 5814, and how much you actually owe, is exactly the kind of thing worth a conversation with your bookkeeper or CFO before you file anything with the state.
The bottom line
Penalty relief isn’t the same as tax forgiveness — it just means the state will meet you halfway if you come forward first. If there’s any chance a service you sell got swept into Washington’s expanded sales tax base last October, it’s worth a quick compliance check now, while the relief window is still open.
