The biggest misconception this calculator addresses is the name itself. There is no such thing as a state self-employment tax. The 15.3% self-employment tax is a federal tax created by the Self-Employment Contributions Act (SECA) and collected by the IRS through Schedule SE. Every self-employed person in the United States pays the same federal SE tax regardless of which state they live in. What varies by state is the state income tax (and, in a few states, a gross-receipts or franchise tax) that is layered on top of your federal bill. So when we say "state SE tax," we really mean: how much extra does your state charge on the same 1099 profit that already owes federal SE tax?
How the Layers Stack
A self-employed dollar of profit is taxed in this order:
- Federal self-employment tax (15.3%) — flat, identical in every state, on net profit.
- Federal income tax — progressive, on taxable income after the one-half SE tax deduction and other adjustments.
- State income tax — only if your state has one; rates and brackets differ wildly.
- Local income tax — only in a few places, most notably New York City and a handful of local jurisdictions.
Because the federal SE tax is constant, moving from a high-tax state to a no-tax state does not reduce your SE tax — it only removes the state layer. That is an important planning distinction: relocating saves state income tax, not SE tax.
Worked Example — $80,000 net profit, compared across states
Federal SE tax (15.3% × $80,000) = $12,240 in every state.
Estimated state income tax on that same profit:
• Texas / Florida / Washington: $0 (no state income tax)
• North Carolina (4.75% flat): ~$2,000
• Illinois (4.95% flat): ~$3,600
• California (~7% effective): ~$5,600
• New York with NYC (~9.25%): ~$7,400
The federal SE tax of $12,240 never changes; only the state row moves. Over a career, that state difference compounds into a large gap.
The Nine States With No Income Tax
If you reside in Alaska, Florida, Nevada, South Dakota, Tennessee, Texas, Washington, Wyoming, or New Hampshire, you owe no state income tax on your earned 1099 income. (New Hampshire currently taxes only interest and dividends, not wages or SE profit; Tennessee eliminated its Hall income tax on ordinary income.) For a freelancer, this is a major advantage: your only layers are federal SE tax plus federal income tax. Note, however, that "no income tax" does not mean "no business tax" — Texas, Washington, and others impose gross-receipts or margin taxes on entities, and every state still has sales tax, property tax, and fees. An S-Corp in these states can still trigger a franchise or B&O tax even though the owner pays no state income tax.
High-Tax States for Freelancers
At the top of the scale, California reaches a 13.3% top rate (most freelancers land in the 9.3% bracket). New York State plus New York City can exceed 12% combined for a city resident. New Jersey tops out at 10.75% for high earners, Oregon at 9.9%, Minnesota at 9.85%, Hawaii at 11%, and Vermont and Maine are also high. These states do not change your federal SE tax, but they add a substantial layer that you must fund through quarterly estimated payments at the state level too.
Flat vs. Progressive State Systems
Some states use a flat rate (e.g., Illinois 4.95%, North Carolina 4.75%, Michigan 4.25%, Pennsylvania 3.07%, Massachusetts 5%), which makes estimating easy: roughly rate × taxable income. Others use progressive brackets (California, New York, Oregon, Minnesota), where your effective rate rises with income. A few states allow a standard deduction or pass-through (PTET) entity credit that can lower the bill. Because rules differ, the calculator looks up your selected state's structure rather than applying a single national rate.
Multi-State and Nexus Issues
If you live in one state but physically perform work in another — common for traveling consultants, touring creatives, and remote contractors — you may create nexus and owe tax to the work state. States use different sourcing rules: some tax income where the work is performed, others where the client is located. To avoid double taxation, most states offer a credit for taxes paid to another state, and some neighboring states have reciprocity agreements (e.g., Maryland–DC, Illinois–Iowa) that let residents file only in their home state. If you work across lines, track your days and locations carefully and expect to file more than one state return.
Entity-Type Interactions
Electing S-Corp status changes the federal math but usually not the fact that you owe state income tax — you pay state tax on both your salary (W-2) and your distributions in most states. A handful of states (e.g., Tennessee, New Hampshire historically, and a few that do not recognize S status) treat the entity differently, and states like California add an $800 minimum franchise tax plus a 1.5% net-income fee above $1,000, while Texas and Washington impose gross-receipts/margin taxes. The break-even analysis for an S-Corp must therefore include state entity taxes, which is why our S-Corp calculator points here.
Common Mistakes
- Thinking you can escape SE tax by moving. SE tax is federal; only the state layer changes with residency.
- Forgetting state quarterly payments. Most income-tax states require their own estimated payments on the same four dates; skipping them brings state underpayment penalties.
- Ignoring local taxes. NYC residents and a few other localities pay an extra layer the calculator flags when relevant.
- Assuming "no income tax" means "no business tax." Texas and Washington gross-receipts taxes can surprise new S-Corps.
- Missing the credit for taxes paid to another state. Without claiming it, a multi-state worker is double-taxed.
- Overlooking the PTET election. Many states now let S-Corps and partnerships pay state tax at the entity level to bypass the federal SALT deduction cap — a valuable move for high earners.
How This Connects to Your Other Taxes
This calculator sits on top of the federal base. Use the Self-Employment Tax calculator for the unchanging 15.3% layer, the Retirement Deduction calculator to shrink taxable income (which often lowers state tax too, since most states start from federal AGI), and the Medicare Surtax calculator for the federal 0.9% on high earners. Gig workers on Uber or Upwork should compute net platform profit first, then run it through both the federal and state calculators to see their true all-in rate. State guides for Arizona, California, Colorado, Florida, Illinois, Michigan, New York, North Carolina, Ohio, Pennsylvania, Texas, and Washington are linked in the footer.