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Connecticut Self-Employment Tax Calculator (2025)

Calculate your self-employment tax in Connecticut including federal SE tax (15.3%), federal income tax, Connecticut state tax, and quarterly estimated payments.

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Total Tax

$22,713

28.39%

Effective Rate

SE Tax

$11,304

Federal Income Tax

$7,971

CT State Tax

$3,439

Quarterly Estimate

$5,679

Summary

On $80,000 of net self-employment income in Connecticut, your total tax is $22,713 (28.39% effective rate), including $11,304 in SE tax, $7,971 in federal income tax, and $3,439 in Connecticut state tax. Quarterly estimate: $5,679.

Connecticut adds $3,439 in state income tax (4.30% effective rate) on top of your federal tax obligations, bringing your total tax to $22,713.

Your net SE income of $80,000 is multiplied by 92.35% to get $73,880 in SE taxable earnings. This factor accounts for the employer-equivalent portion of FICA.

The 15.3% SE tax rate includes 12.4% for Social Security and 2.9% for Medicare. Your total SE tax is $11,304, and you can deduct $5,652 (half) from your gross income.

Your estimated quarterly payment is $5,679, due in April, June, September, and January. Missing payments may result in underpayment penalties.

Income Tax: $7,971
SS Tax: $9,161
CT State Tax

SE Tax Calculation Journey

12 rows

StepAmount
Net SE Income$80,000
SE Income (92.35%)$73,880
Social Security Tax$9,161
Medicare Tax$2,143
Total SE Tax$11,304
Deductible Half$5,652
AGI$74,348
Taxable Income$59,348
Federal Income Tax$7,971
Connecticut Income Tax$3,439
Total Tax$22,713
Quarterly Estimate$5,679

Estimated federal and Connecticut self-employment tax. Does not include QBI deduction, local taxes, or tax credits. Quarterly estimate assumes equal payments. Not tax advice.

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