Connecticut Self-Employment Tax Calculator (2026)
Enter your 2026 business profit. We figure the 15.3% self-employment tax line by line, then add an estimate of federal and Connecticut income tax so you know roughly how much to set aside.
Estimates for education only, not tax, legal, investment, or insurance advice.
How self-employment tax works in Connecticut
When you work for an employer, Social Security and Medicare come out of every paycheck and your employer pays a matching share. When you work for yourself, you pay both halves. That is self-employment (SE) tax, and it is often a bigger bill than federal income tax for new freelancers.
The 2026 formula
- Start with net profit: your business income minus ordinary and necessary business expenses.
- Multiply by 92.35%. This trims out the “employer half” so you are taxed like an employee would be.
- Social Security, 12.4%, on that amount up to $184,500 for 2026. If you also have a W-2 job, your wages use up part of that $184,500 first.
- Medicare, 2.9%, on all of it, with no cap.
- Additional Medicare, 0.9%, on earnings over $200,000 ($250,000 married filing jointly), counting wages and SE earnings together.
If the 92.35% figure is under $400, you owe no SE tax for the year.
Two built-in breaks
You deduct half of your SE tax when you figure your adjusted gross income, which lowers both federal and Connecticut income tax (Connecticut starts from federal AGI). Many sole proprietors and single-member LLC owners may also qualify for the federal qualified business income (QBI) deduction of up to 20%, subject to limits. The calculator applies both in its estimate.
Does Connecticut have its own self-employment tax?
No. SE tax is federal only. Connecticut taxes your business profit through its regular income tax, at rates from 2% to 6.99%. Self-employed people aren’t required to pay into CT Paid Leave, though they can opt in.
Paying it during the year
No one withholds SE tax for you, so most self-employed people pay estimated tax four times a year. For 2026 the federal and Connecticut dates are April 15, June 15 and September 15, 2026, and January 15, 2027. Our quarterly tax calculator works out the safe-harbor amounts, and the CT estimated payments guide explains how to pay.
Ways to lower it legitimately
- Track every deductible business expense; each dollar lowers SE tax and income tax. The mileage and home office calculators help with two of the most-missed ones.
- Once profit is steady and high enough, an S-Corp election can reduce SE tax. Compare with the LLC vs. S-Corp calculator.
Frequently asked questions
What is the self-employment tax rate for 2026?
15.3% in total: 12.4% for Social Security on the first $184,500 of net earnings and 2.9% for Medicare on all of it. It applies to 92.35% of your net profit. An extra 0.9% Medicare tax applies to earnings over $200,000 ($250,000 married filing jointly).
Do I pay self-employment tax in Connecticut?
Self-employment tax is federal, so you pay it wherever you live. Connecticut has no separate state self-employment tax, but your business profit is subject to Connecticut income tax at rates from 2% to 6.99%.
How much self-employment tax will I pay on $50,000?
On $50,000 of net profit, 92.35% is $46,175, and 15.3% of that is about $7,065 in self-employment tax for 2026. Federal and Connecticut income tax come on top of that.
Do I owe self-employment tax if I made less than $400?
No. If 92.35% of your net profit from self-employment is less than $400, you generally don’t owe self-employment tax for the year, though you may still need to report the income.
Does a single-member LLC pay self-employment tax?
Yes, by default. A single-member LLC is treated like a sole proprietorship for federal tax, so its profit goes on Schedule C and is subject to self-employment tax. An LLC that elects S-Corp tax treatment pays payroll tax on the owner’s salary instead.
Sources and assumptions (updated Nov 2026)
- IRS Topic 554, Self-employment tax: 12.4% Social Security + 2.9% Medicare; 92.35% of net earnings; $400 threshold; deduct half of SE tax; 0.9% Additional Medicare over $200,000 ($250,000 MFJ).
- SSA 2026 fact sheet: maximum taxable earnings $184,500; self-employed rate 15.30%.
- IRS, 2026 inflation adjustments and Rev. Proc. 2025-32: 2026 brackets, standard deduction ($16,100 / $32,200 / $24,150), QBI threshold ($201,750 / $403,500) and $400 minimum QBI deduction.
- CT DRS Form CT-1040ES (2026): Tables A–E (exemption, 2%–6.99% rates, phase-out, recapture, personal credit); estimated payment dates.
- CT Paid Leave Authority: sole proprietors and self-employed individuals aren’t required to participate but may opt in.
- Simplifications (estimate): standard deduction only; QBI figured at 20% with the taxable-income limit and the specified-service phase-out above the threshold; no credits, retirement contributions, self-employed health insurance deduction, or optional SE methods. The quarterly figure is total estimated tax divided by four, before any withholding or safe-harbor planning.
Estimates for education only, not tax, legal, investment, or insurance advice.
Questions about your numbers? Talk them through with a Connecticut tax preparer on a short call.