Self-Employment Tax in Connecticut
What a freelancer or 1099 contractor really owes in Connecticut, the 15.3% self-employment tax, federal income tax, and Connecticut's state income tax. Real numbers, instant, no sign-up.
What Connecticut self-employed taxes look like
Estimated 2026 total tax for a single filer, net self-employment profit, Connecticut.
| Net profit | Total tax | Connecticut state tax | Effective rate |
|---|---|---|---|
| $40,000 | $8,850 | $1,423 | 22.1% |
| $75,000 | $18,578 | $3,084 | 24.8% |
| $120,000 | $33,903 | $5,441 | 28.3% |
Tell us about your year
Enter your self-employment income to see your estimated federal + state tax, self-employment tax, and quarterly payments, instantly.
Connecticut self-employment tax, in plain terms
Self-employment tax, 15.3% of your net earnings for Social Security and Medicare, is federal and the same in every state. What differs in Connecticut is the income-tax layer. Connecticut taxes your self-employment profit at its own rates on top of federal income tax, so your all-in effective rate runs a few points higher than in a no-income-tax state. The calculator above already applies Connecticut's brackets, so the number you see is the real one.
Frequently asked
Does Connecticut have a state income tax for the self-employed?
Yes. On top of federal income tax and the 15.3% self-employment tax, Connecticut taxes your self-employment income at its state rates. On a $100,000 self-employed income, Connecticut's income tax works out to roughly 4.4% of income in this estimate.
How much self-employment tax will I owe in Connecticut?
Self-employment tax itself is the same everywhere, 15.3% of 92.35% of your net profit, for Social Security and Medicare. What changes by state is the income-tax layer on top. Use the calculator above with your own numbers; it already applies Connecticut's brackets.
Do I pay quarterly estimated taxes in Connecticut?
If you expect to owe $1,000 or more in federal tax, the IRS wants quarterly estimated payments (mid-April, June, September, and January). Connecticut generally has its own quarterly estimates too when you owe state tax. The calculator shows your next federal quarterly amount.