You run a small business in Washington, which means you pay tax on nearly every dollar that comes through the door — the Business and Occupation (B&O) tax applies to your gross receipts, with no deduction for rent, payroll, or inventory. But if your business is small enough, a quiet little credit may already be wiping your entire B&O bill to zero every filing period. And that credit is scheduled to more than double on January 1, 2029 — from $160 to $375 a month for service businesses, and from $55 to $125 a month for everyone else.
There is a catch, and it is a big one: the increase only happens if the state's brand-new tax on income above $1 million survives both a pending constitutional lawsuit and a repeal vote on your November 3 ballot. Here is how the credit works today, what changes in 2029, and what to do in the meantime.
How the Small Business B&O Tax Credit Works Today
Washington has no personal or corporate income tax, so the B&O tax on gross receipts is the state's main business tax. Rates depend on your classification: retailing is 0.471%, wholesaling and manufacturing 0.484%, and services are tiered by gross income — 1.5% under $1 million, 1.75% between $1 million and $5 million, and 2.1% above $5 million.
The Small Business B&O Tax Credit (credit ID 720 on your excise return, authorized by RCW 82.04.4451) then reduces or eliminates that bill for the smallest businesses. Which cap you get depends on where your income falls:
- Service businesses — at least 50% of taxable income reported under Service and Other Activities and similar service classifications — get a maximum credit of $160 per month in the reporting period.
- All other businesses (retailers, wholesalers, manufacturers, contractors) get $55 per month in the reporting period.
The credit scales with your filing frequency: multiply the monthly figure by the number of months in the period.
| Filing frequency | Non-service max credit | Service max credit |
|---|---|---|
| Monthly | $55 | $160 |
| Quarterly | $165 | $480 |
| Annual | $660 | $1,920 |
If the B&O tax on your return is at or below the max, the credit equals the whole tax — you owe zero B&O tax for the period. Above the max, the credit shrinks dollar-for-dollar and disappears entirely once the period's B&O bill reaches twice the max ($320 a month for service businesses, $110 for non-service). The Department of Revenue publishes the phaseout in $5-increment tables, and if you file electronically the system calculates your credit automatically.
In revenue terms, the credit today roughly exempts the first $125,000 of business income and phases out completely around $250,000. The math checks out: a service business under $1 million pays 1.5%, so a $160 monthly credit covers $10,667 a month in gross receipts — about $128,000 a year.
There is also a filing break tied to the same idea. If your annual gross income across all B&O classifications is under $125,000 and you do not owe other taxes or fees to the Department of Revenue, you generally do not have to file an annual B&O return at all. Note the qualifier: collecting retail sales tax, owing city-level B&O tax (Seattle and several other cities levy their own, with separate filing), or any other liability can still put you on a filing schedule.
A quick example
A freelance graphic designer files quarterly, reports everything under Service and Other Activities at 1.5%, and grosses $24,000 for the quarter. Her B&O tax is $360 — under the $480 quarterly service cap — so the credit wipes it out and she owes nothing. If a blowout quarter pushes her B&O bill to $700, she is in the phaseout band ($480–$960) and gets a $260 credit, owing $440.
What Changes on January 1, 2029
Senate Bill 6346, signed March 30, 2026, raises both caps and the filing threshold:
| Today | Starting Jan. 1, 2029 | |
|---|---|---|
| Non-service max credit | $55/month | $125/month |
| Service max credit | $160/month | $375/month |
| Annual filing threshold | $125,000 | $250,000 |
That is a 127% increase for non-service businesses and a 134% increase for service businesses — the largest small-business B&O break in state history. A quarterly service filer would see the max credit jump from $480 to $1,125 per quarter; an annual service filer from $1,920 to $4,500 a year.
Translated to revenue at the 1.5% service rate, a $375 monthly credit fully covers $25,000 a month in gross receipts — $300,000 a year of service income with zero B&O tax. For a retailer at the scheduled 0.5% rate, the new $125 monthly cap similarly covers about $300,000 a year. And with the filing threshold doubling to $250,000, a large group of side businesses and micro-firms would drop off the annual-return rolls entirely.
The same bill also repeals the retail sales tax that has applied to many services since October 2025 — custom software, IT consulting and support, custom website development, data processing, security and investigation services, temporary staffing, and live presentations — effective the same day. If you sell services and have been collecting sales tax since last fall, that repeal matters to your invoicing as much as the credit matters to your B&O bill.
The Catch: Two Hurdles Before You See a Dollar
To pay for the relief, SB 6346 created a new 9.9% tax on individual income above $1 million, effective January 1, 2028, with a full credit for B&O and capital gains taxes already paid. And the small-business relief is explicitly contingent: the credit increase and the rest of the package are null and void if a court of final jurisdiction invalidates the new income tax.
That contingency is live, twice over:
-
The courts. A constitutional lawsuit challenging the new income tax was filed in April 2026 and is still pending. Washington voters have rejected income taxes repeatedly, and an earlier attempt to force the question onto the ballot through the referendum process was shut down by the state Supreme Court in May 2026 — which is why the fight moved to court and to the initiative process instead.
-
Your ballot. Initiative 645, which would repeal the new tax on income above $1 million, qualified for the November 3, 2026 ballot after supporters submitted more than 500,000 signatures. If voters approve it, the tax is repealed and never takes effect — pulling the funding out from under the small-business relief package built on top of it.
Either path could erase the 2029 credit increase before it starts. That does not make it fiction — it is signed law with a fixed effective date — but it does make it a forecast, not a fact. Plan accordingly.
What to Do Now: 5 Moves Before 2029
1. Confirm you are actually claiming the credit
If you file electronically, the Department of Revenue calculates it for you — but only if your classifications are right. Paper filers must look up the table themselves. Either way, pull your last four returns and verify the credit line. Businesses that drift across the 50%-service line as their revenue mix changes sometimes claim the wrong tier for years.
2. Know which tier you are in — it can flip year to year
The service test is period-by-period: at least half your taxable income in service classifications. A contractor who adds a retail parts counter, or a retailer who launches a consulting sideline, can cross the line in either direction. Track income by B&O classification every period, not just at year-end.
3. Do not confuse "no B&O due" with "no return due"
A zero B&O bill after the credit does not excuse you from filing if you are on a monthly or quarterly schedule, collect sales tax, or owe city B&O tax. Only the under-$125,000 annual threshold (and no other liabilities) gets you off the return rolls. Missed returns draw penalties even when the tax would have been zero.
4. Model the 2029 numbers into your pricing now
If the increase survives, a service business grossing $200,000–$300,000 a year goes from a partial credit to owing nothing. That is real margin — up to $4,500 a year for an annual service filer at the cap. Build two forecasts (credit survives / credit dies) rather than baking either into your prices today.
5. Watch the November result and the court docket, then revisit
The November 3 vote resolves the political half of the uncertainty within weeks. The lawsuit will take longer. Put a reminder on your calendar for each: after the election, update your 2028–2029 tax forecast, and revisit it again when the constitutional case is decided.
Track Your B&O Exposure by Classification, Every Period
The businesses that capture the full credit share one habit: their books separate gross receipts by B&O classification as money comes in, so the 50% service test, the right credit table, and the filing threshold are all answerable from the ledger — not reconstructed from bank statements at filing time. The same records back you up if the Department of Revenue ever questions your classification or your credit.
That is exactly the kind of tracking plain-text accounting excels at: every dollar tagged to an explicit account, version-controlled, and yours to query however the rules change. For background on structuring a ledger this way, see /docs/.
Keep Your B&O Records Audit-Ready From Day One
As Washington's B&O rules shift — tiered service rates today, a possible doubled credit in 2029 — maintaining clean, classification-level records is what turns a tax break on paper into money you actually keep. Beancount.io provides plain-text accounting that gives you complete transparency and control over your financial data — no black boxes, no vendor lock-in. Get started for free and see why developers and finance professionals are switching to plain-text accounting.
