Self-Employed Tax Calculator — Connecticut (2026)
Self-employed in Connecticut? Your tax bill has three layers that a W-2 employee never sees in full: 15.3% self-employment tax on 92.35% of net profit, federal income tax, and Connecticut state income tax. This calculator applies all three to your 2026 net profit and shows the quarterly amount you should be setting aside. Connecticut uses a progressive income tax with 7 brackets running from 2.00% up to 6.99%, applied after a state standard deduction of $0.
Connecticut Self-Employed Tax Calculator
Gross 1099 income minus business expenses.
Self-employment tax vs Connecticut income tax
Self-employment tax is federal and identical in all 50 states: 12.4% Social Security up to $184,500 of net earnings plus 2.9% Medicare with no cap. Half of it is deductible against income tax, which is why the calculator subtracts it before applying brackets.
Connecticut then taxes essentially the same profit figure at 2.00%–6.99%. On $80,000 of net profit that adds roughly $3,339 to the bill.
Connecticut has no separate city or county income tax, so the state figure above is the full sub-federal income tax you pay.
Deductions that matter for Connecticut freelancers
Net profit — not gross revenue — drives every number here. Ordinary and necessary business expenses reduce SE tax, federal tax, and Connecticut tax simultaneously: the 2026 standard mileage rate of $0.67/mile, home-office square footage, software, equipment, professional insurance, and the self-employed health insurance deduction.
Retirement plans go further. A SEP-IRA or solo 401(k) reduces income tax (though not SE tax) and is often the largest single deduction available to a profitable insurance contractor in Hartford.
Working for yourself in Connecticut
Connecticut's economy leans on insurance, finance, and defense, which shapes the contractor market around Hartford — and your fixed costs. With one-bedroom rent near $1,500, a freelancer needs meaningfully more gross revenue than an employee to reach the same lifestyle, because there is no employer paying half of FICA.
Connecticut's lowest bracket dropped from 3% to 2% in 2026 — the first state income tax cut in Connecticut's history.
Local and payroll taxes Connecticut adds on top
Paid Family and Medical Leave takes 0.5% of wages up to the Social Security wage base. That deduction sits outside the federal and state income tax lines, so build it into your own budget on top of the numbers above.
Connecticut has no separate city or county income tax, so the state figure above is the full sub-federal income tax you pay.
Nobody withholds these for you when you are self-employed in Connecticut. Local wage taxes, city business licences and gross-receipts style levies are yours to register for and remit alongside your quarterly federal and state estimates.
Working across a state line from Connecticut
Connecticut has no income-tax reciprocity agreements, so if you live here and work across a state line you generally file a nonresident return in the work state and claim a credit at home to avoid double taxation.
Remote and hybrid work complicates this further: most states tax income where the work is physically performed, so a Hartford resident spending part of the year at a client site in Massachusetts may owe a nonresident return there. Keep a day-count log if you split time between states.
The rest of your Connecticut tax bill
Connecticut charges a 6.35% state sales tax, homeowners pay an average effective property tax of 1.79% of market value, and the minimum wage in force during 2026 is $16.94 an hour.
No local sales tax, so 6.35% is the rate statewide.
Income tax is only one part of a state's take. Connecticut recovers revenue through sales and property tax as well, which is why headline income tax rates alone are a poor guide to how far a salary really goes. Connecticut phases out tax on Social Security, pensions and annuities below income thresholds ($75,000 single).
Connecticut vs Massachusetts on the same salary
On a $90,000 salary, a single filer keeps about $67,945 a year in Connecticut against roughly $67,645 in Massachusetts — a difference of $300, or $25 a month.
Effective combined rates are 24.5% in Connecticut and 24.8% in Massachusetts. Set that gap against living costs: index 116 here versus 148 there, with property tax at 1.79% and 1.14% respectively.
Connecticut income tax brackets 2026 (single filer)
| Taxable income | Rate |
|---|---|
| $0 – $10,000 | 2.00% |
| $10,000 – $50,000 | 4.50% |
| $50,000 – $100,000 | 5.50% |
| $100,000 – $200,000 | 6.00% |
| $200,000 – $250,000 | 6.50% |
| $250,000 – $500,000 | 6.90% |
| $500,000 and up | 6.99% |