Connecticut Self-Employment Tax Calculator — 2026

Calculate your self-employment tax liability including Social Security and Medicare contributions. Free calculator with Connecticut-specific rates.

Quick Connecticut Tax Estimate

Based on Connecticut's tax rates for 2026. Enter your details for a personalized calculation.

State Tax on $80K Profit
$1,651.17
SE Tax
$11,303.64
Effective Rate
22.2%
Marginal Rate
12%
Full Connecticut Tax Calculator →

Connecticut Tax Information

State Income TaxYes
Top Marginal Rate7%
Sales Tax0%
LLC Filing Fee$0
Annual Report Fee$None
Standard DeductionN/A

Self-employed pay both federal and Connecticut state tax.

Connecticut Income Tax Brackets (2026)

Tax RateFromTo
2%$0$10,000
4.5%$10,000$50,000
5.5%$50,000$100,000
6%$100,000$200,000
6.5%$200,000$250,000
6.9%$250,000$500,000
7%$500,000No limit

Connecticut Quarterly Tax Deadlines

Q1
Apr 15
Q2
Jun 16
Q3
Sep 15
Q4
Jan 15

Frequently Asked Questions

What is the self-employment tax rate in Connecticut?
Self-employment tax has two parts: 12.4% Social Security tax and 2.9% Medicare tax, totaling 15.3% federally. Connecticut's state income tax (if applicable) is additional. Use our calculator above for your personalized rate.
Do I need to pay estimated taxes in Connecticut?
Yes. If you expect to owe $1,000 or more in taxes, the IRS requires quarterly estimated tax payments. Connecticut may have its own threshold. Our quarterly tax calculator helps you determine exact amounts.
What deductions can I claim as self-employed in Connecticut?
Common deductions include home office ($5/sq ft), health insurance premiums (100%), retirement contributions (SEP IRA up to $69,000), business equipment, vehicle expenses, and professional services. Use our deduction checklist for the full list.
How does a 1099 work in Connecticut?
If you earn $600+ from a client, they should issue Form 1099-NEC. You're responsible for reporting all income and paying self-employment tax on your net profit, regardless of whether you receive a 1099.
Should I form an LLC in Connecticut for tax savings?
An LLC alone doesn't change your tax rate — you still pay the same self-employment tax. However, electing S-Corp status can save thousands if your net profit exceeds $60,000-80,000. Use our business structure optimizer to compare.