If your business operates within the city of Seattle—whether you are a high-earning freelance consultant or a rapidly scaling tech startup—you are likely familiar with the Seattle Business & Occupation (B&O) tax.

Unlike the federal income tax, the B&O tax is a gross receipts tax. It does not care about your profit margins, your operating expenses, or your losses. You are taxed purely on top-line revenue. Historically, this meant even cash-strapped, pre-profit startups were hit with frustrating local tax bills.

However, the local tax landscape shifted dramatically with the passage of Proposition 2 in late 2025. Effective January 1, 2026, the Seattle B&O tax underwent a massive structural overhaul. While it provides unprecedented relief for small businesses, it introduces complex new math (and higher tax rates) for growing companies.

Here is exactly how the newly overhauled 2026 Seattle B&O tax works and how to project your liability.

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TL;DR: The 2026 Seattle B&O Tax Overhaul

Concept	The 2026 Update (Proposition 2)	What it Means for Your Business
The New Threshold	Increased from $100,000 to $2 Million.	If your Seattle-sourced gross revenue is under $2 Million, you owe $0 in Seattle B&O tax.
The Standard Deduction	A new $2 Million standard deduction is available to all businesses.	If you make $3 Million, you deduct $2 Million and only pay the tax on the remaining $1 Million.
The Tax Rates	Increased across all classifications (Retailing, Wholesaling, Services).	To fund the new deduction, the city raised the base rates. Businesses well over the $2M mark will pay more.
Filing Requirement	Mandatory. Even if you owe $0, you must file a return.	Do not ignore the city. Failing to file a $0 return triggers late fees and estimated tax penalties.
Filing Frequency	The threshold jump means many quarterly filers will be moved to Annual filing.	The city will notify eligible businesses of this change in early 2026.

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1. The $2 Million Threshold vs. The Standard Deduction

The most confusing aspect of the 2026 law is that it introduced two distinct concepts that sound identical but operate differently depending on your revenue: the $2 Million Threshold and the $2 Million Standard Deduction.

The $2 Million Threshold (For Small Businesses)

A taxable threshold is a cliff. If your Seattle-sourced gross revenue is less than $2,000,000 for the calendar year, you are under the threshold. You owe zero Seattle B&O tax. The standard deduction does not apply to you because you already owe nothing.

• Action Item: You still must file an annual return reporting your gross income to officially claim the threshold exemption and owe $0.

The $2 Million Standard Deduction (For Scaling Businesses)

If your Seattle-sourced gross revenue exceeds $2,000,000, you have crossed the threshold. This is where the new standard deduction kicks in to soften the blow.

• The Math: If your SaaS startup generates $3,500,000 in Seattle gross receipts in 2026, you apply the $2 Million standard deduction. Your actual taxable amount is reduced to $1,500,000. You calculate your B&O tax strictly on that remaining $1.5M.

2. The Catch: Higher B&O Tax Rates

The city did not just hand out a massive tax cut out of goodwill. To compensate for the lost revenue from exempting small businesses, Proposition 2 increased the B&O tax rates across all business classifications starting January 1, 2026.

If you are a high-revenue company (for example, generating $10 Million+ in gross receipts), the math shifts against you. While you get to deduct the first $2 Million, the increased tax rate applied to your remaining $8 Million will likely result in a higher overall tax bill than you paid in 2025.

Why Classification Matters More Than Ever:

Because rates have increased, ensuring your revenue is categorized correctly is vital. Software companies and B2B consultants are generally classified under “Service and Other,” which carries a significantly higher tax rate than “Retailing” or “Wholesaling.” Misclassifying your revenue under the new higher rates can trigger expensive, multi-year audits.

3. Geography: Apportioning Your Revenue

Because the $2 Million threshold is so generous, understanding what revenue actually belongs to Seattle is the most powerful tax-planning tool available to local founders.

You only pay the Seattle B&O tax on revenue that is sourced within Seattle city limits.

If you run a digital marketing agency headquartered in Pioneer Square, but half of your clients are located in Bellevue, Redmond, or out of state, not all of your revenue is subject to the Seattle B&O tax. Washington utilizes complex “Service Income Apportionment” rules based on where the benefit of the service is received. By properly tagging client locations in your bookkeeping software, you can legally deduct interstate and non-Seattle sales from your gross receipts before you even test the $2 Million threshold.

4. The State B&O Tax Remains Unchanged

Do not confuse the Seattle B&O tax with the Washington State B&O tax. They are two entirely separate entities administered by two different government bodies.

While the City of Seattle gave you a $2 Million standard deduction for 2026, Washington State did not. The state-level B&O tax still applies to almost all business activity in Washington, with much lower exemption thresholds (often kicking in around the $100,000 to $125,000 mark depending on your classification and available Small Business Credits).

You must file and pay your State B&O to the Washington Department of Revenue, and your Seattle B&O separately to the City of Seattle.

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Frequently Asked Questions

Does the new $2 Million deduction apply to my Seattle Business License Fee?

No. The standard deduction is strictly for calculating your B&O tax liability. The City of Seattle calculates your annual Business License Tax Certificate fee based on your total taxable revenue before the standard deduction is applied.

If I file quarterly, how do I apply the $2 Million standard deduction?

If you are required to file quarterly (because your revenue is exceptionally high), you apply the standard deduction as early in the year as possible. You deduct up to the full $2 Million in Q1. If you don’t use it all in Q1, the remainder rolls over to Q2. Once the $2 Million limit is exhausted for the calendar year, you pay the full tax rate on all subsequent quarterly revenue.

Are nonprofits exempt from the Seattle B&O tax?

Many 501(c)(3) nonprofits are exempt from the Seattle B&O tax, provided they meet specific city requirements. Furthermore, Proposition 2 also introduced new, targeted credits specifically for comprehensive cancer centers and pediatric hospitals to offset the 2026 rate increases.