Finance · Washington · Tax year 2026

Washington Self-Employment Tax Calculator 2026

On $100,000 of 2026 self-employment profit, a single Washington sole proprietor with no other income owes about $22,365: $14,130 of self-employment tax, $8,235 of federal income tax, and no Washington income tax. That is 22.4% of profit, or $5,591 for each quarterly estimated payment.

Against its neighbors, the same $100,000 of profit costs $6,579 more in Oregon and $3,827 more in Idaho.

State income tax: None on wages or self-employment income
Washington tax on $100,000: $0
National rank: $0 — tied with 9 others for lowest
Set aside on $100,000: 22.4%
LLC filing fee: $180
State sales tax: 6.5% + local

State

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Net self-employment profit (2026)

Other income (W-2 wages, spouse, interest)

More options

Retirement + health insurance deductions

Local income tax rate (optional)

Service business (consulting, law, health, accounting, financial services, performing arts). Only matters for the QBI deduction at higher incomes.

Enter your net profit — revenue minus business expenses — to see how much to set aside and what to pay each quarter.

A 2026 planning estimate using the standard deduction, not a tax return: it ignores credits, itemized deductions, and AMT. All calculations happen in your browser. Nothing is stored.

✳ Free · No signup · Runs in your browser — we never store your numbers

Washington self-employment tax at common profit levels

2026 estimates for a single filer with no other income, using the standard deduction and no retirement or health insurance deductions. Washington does not tax this income, so every dollar here is federal; the neighbor comparison below shows what the same profit would cost next door.

Profit	SE tax	Federal income tax	Total	Set aside	Quarterly
$40,000	$5,652	$1,775	$7,427	18.6%	$1,857
$60,000	$8,478	$3,559	$12,037	20.1%	$3,009
$80,000	$11,304	$5,344	$16,647	20.8%	$4,162
$100,000	$14,130	$8,235	$22,365	22.4%	$5,591
$150,000	$21,194	$16,413	$37,608	25.1%	$9,402
$250,000	$29,851	$36,509	$66,360	26.5%	$16,590

Washington vs its neighbors

The same $100,000 of 2026 profit for a single sole proprietor, run through each state's rules. Federal tax is the same everywhere, so the difference is state income tax. Against its neighbors, the same $100,000 of profit costs $6,579 more in Oregon and $3,827 more in Idaho.

State	State income tax	Total tax	Set aside	vs Washington
Washington	$0	$22,365	22.4%	—
Idaho	$3,827	$26,192	26.2%	+$3,827
Oregon	$6,579	$28,943	28.9%	+$6,579

How the gap changes with profit

Extra tax (+) or savings (−) for a single filer if the same business were based in each of its neighbors instead of Washington.

Profit	Idaho	Oregon
$40,000	+$872	+$2,265
$60,000	+$1,857	+$3,735
$80,000	+$2,842	+$5,205
$100,000	+$3,827	+$6,579
$150,000	+$6,290	+$11,411
$250,000	+$11,368	+$21,243

Married filing jointly

Profit	Idaho	Oregon
$40,000	+$10	+$1,552
$60,000	+$749	+$3,049
$80,000	+$1,734	+$4,529
$100,000	+$2,719	+$6,000
$150,000	+$5,182	+$9,767
$250,000	+$10,260	+$18,670

What's different about Washington for the self-employed

Washington has no income tax on wages or self-employment income in 2026.
Sole proprietors owe Business & Occupation (B&O) tax on gross receipts: 1.5% for most service businesses under $1 million. The small business B&O credit (up to $160 a month for service businesses) wipes out the tax up to about $128,000 of annual service receipts.
Many cities, including Seattle, Tacoma, and Bellevue, add their own B&O tax.
Most businesses owe the Business & Occupation (B&O) tax, a gross receipts tax with no deduction for labor, materials or other costs; the rate depends on the activity classification.
You must register with the Department of Revenue for a state business license (UBI number) if, among other triggers, gross income is $12,000 a year or more, you collect sales tax, or you operate under a name other than your full legal name.

LLC fees and sales tax in Washington

Forming an LLC: $180 state filing fee.
Annual Report: $70, every year, due by the end of your anniversary month.
Sales tax: 6.5% statewide, plus local rates in many cities and counties. Use the Sales Tax Calculator to price a sale.

A single-member LLC is taxed exactly like a sole proprietorship unless it elects S or C corporation status, so the self-employment tax figures on this page apply either way.

Washington self-employment tax FAQs

How much should I set aside for taxes if I'm self-employed in Washington?

For a single filer with no other income, about 20.1% of profit at $60,000, 22.4% at $100,000, and 25.1% at $150,000 for 2026. That is 6.5 points less than in Oregon, the costliest of its neighbors at 28.9%. Enter your own numbers in the calculator for a personal figure.

Does Washington tax self-employment income?

No. Washington has no income tax on wages or self-employment income in 2026. Federal self-employment tax and federal income tax still apply.

What Washington business taxes still apply without an income tax?

Sole proprietors owe Business & Occupation (B&O) tax on gross receipts: 1.5% for most service businesses under $1 million. The small business B&O credit (up to $160 a month for service businesses) wipes out the tax up to about $128,000 of annual service receipts. Many cities, including Seattle, Tacoma, and Bellevue, add their own B&O tax.

How much does an LLC cost in Washington?

The state filing fee to form an LLC is $180. Annual Report: $70, every year, due by the end of your anniversary month. A single-member LLC is still taxed like a sole proprietorship for federal purposes, so the self-employment tax figures above apply.

Sources and method

Computed with the Self-Employment Tax Calculator's 2026 engine and Washington's rules from the sources below. Planning estimates, not a return. Last checked 2026-10-08.