2025 Tax Year

Washington Side Hustle Tax Calculator

Washington has no state income tax. Calculate your federal self-employment tax instantly.

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Last updated: January 2026 · Data from IRS Rev Proc 2024-40

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Side Hustle Income *

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Washington State side hustlers enjoy the benefit of no state income tax—making it one of the best states for freelancers and gig workers. Whether you're a tech contractor in Seattle, a rideshare driver in Spokane, or an online seller in Tacoma, you won't owe any Washington state tax on your earnings. However, be aware of the state's high sales tax and the new capital gains tax on investment income.

Washington Tax Guide

How Side Hustle Taxes Work in Washington

Washington is one of nine states with no state income tax:

**What Washington side hustlers pay:** - **Federal self-employment tax**: 15.3% - **Federal income tax**: 10-37% on total income - **Washington state income tax**: $0

**Important notes:** - Washington has NO income tax on side hustle earnings - The 7% capital gains tax only applies to investment gains, not self-employment income - Washington's high sales tax (6.5% state + local) doesn't affect your income - No local income taxes in Seattle or anywhere in WA

Example

What Washington Side Hustlers Owe

Let's say you're a single filer in Seattle with a $75,000 W-2 job and $22,000 in side hustle income from freelance software development, with $4,000 in expenses.

**Your estimated taxes on the side hustle:** - Net self-employment income: $18,000 - Federal SE tax (15.3% of 92.35%): ~$2,545 - Federal income tax on side income: ~$4,320 (24% bracket) - Washington state tax: $0 - **Total additional tax: ~$6,865**

Compare this to California where you'd pay an additional ~$1,674 in state taxes, or New York with ~$1,233 more. Washington residents save significantly.

Important Dates

Washington Tax Deadlines 2025

Since Washington has no state income tax, you only track federal deadlines: - **Q1**: April 15, 2025 - **Q2**: June 16, 2025 - **Q3**: September 15, 2025 - **Q4**: January 15, 2026

Use IRS Form 1040-ES for federal quarterly estimated payments. No state estimated payments required.

Save Money

Common Deductions for Washington Freelancers

Washington side hustlers should maximize every federal deduction since there's no state tax to offset. **Home office deduction**: Claim dedicated space using simplified ($5/sq ft, max $1,500) or actual expense method—especially valuable given Seattle's high housing costs. **Business mileage**: 67 cents/mile for 2025; critical for rideshare drivers, delivery workers, and anyone meeting clients across the Puget Sound region. **Equipment and software**: Computers, phones, cameras, and professional tools; Section 179 allows immediate expensing up to $1.22 million. **Professional services**: Accounting, legal, and tax preparation fees are fully deductible. **Marketing and advertising**: Website hosting, SEO services, social media ads, and business cards qualify. **Health insurance premiums**: Self-employed individuals can deduct 100% of health, dental, and vision insurance. **Retirement contributions**: SEP-IRAs (up to 25% of net self-employment income, max $69,000) and Solo 401(k)s reduce federal taxable income. **The 20% QBI deduction** is especially valuable for Washington side hustlers—with no state tax, this federal deduction provides your maximum savings. Every $1 you deduct saves you at your federal marginal rate (typically 22-32% for most side hustlers).

Common Questions

Washington Side Hustle Tax FAQ

Does Washington State tax side hustle income?

No, Washington has no state income tax on earned income including self-employment. You only pay federal self-employment tax (15.3%) and federal income tax on your side hustle.

Does Seattle have a city income tax?

No, Seattle and all Washington cities have no local income taxes. Washington's tax burden comes from sales tax, not income tax.

What about Washington's capital gains tax?

Washington's 7% capital gains tax only applies to gains from selling investments (stocks, bonds). It does NOT apply to side hustle income or self-employment earnings.

Do I need to register my side hustle in Washington?

Most businesses in Washington need to register with the Department of Revenue for a Business License (also called a UBI number). This applies even if you have no state income tax. Sellers may also need a Reseller Permit. Some cities like Seattle require additional business licenses.

Does Washington have a B&O tax on side hustles?

Yes, Washington's Business & Occupation (B&O) tax is a gross receipts tax that may apply to side hustles, though small businesses with gross income under $28,000 per quarter may be exempt. Rates vary by business type (typically 0.471% to 1.5%). This is separate from income tax.

Can I maximize retirement deductions in Washington?

Absolutely. Since Washington has no state income tax, every dollar you contribute to a SEP-IRA or Solo 401(k) reduces only your federal taxes. This means you get the full federal tax benefit without losing any state tax savings. For 2025, you can contribute up to 25% of net self-employment income to a SEP-IRA.

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