What is Connecticut's income tax rate for self-employed workers in 2026?

Graduated brackets from 2% up to 6.99%. Most gig workers with $30,000–$90,000 of net profit pay an effective Connecticut rate near 4.5% to 5.5%.

Do any Connecticut cities tax self-employment income?

No. Neither Hartford, New Haven, Stamford nor any other Connecticut municipality levies an income tax, so Form CT-1040 is your only state income tax return.

When are Connecticut quarterly estimated taxes due?

Form CT-1040ES payments are due April 15, June 15, September 15, 2026 and January 15, 2027. Connecticut requires estimates if you expect to owe $1,000 or more of state tax.

I live in Connecticut but drive Uber in New York — who taxes that income?

Both can. As a Connecticut resident you report all 1099 profit to Connecticut, and New York may tax the NY-source portion; Connecticut gives you a credit for tax paid to New York so you are not fully double-taxed.

How much should a Connecticut gig worker set aside for taxes?

About 27% to 33% of net profit covers federal income tax, the 15.3% self-employment tax and the Connecticut state layer together.

Does the mileage deduction lower my Connecticut tax?

Yes. Connecticut starts from your federal figures, so claiming the 2026 rate of $0.70 per business mile reduces both federal and Connecticut taxable income.

Connecticut Self-Employed Tax Calculator

Federal income tax + 15.3% self-employment tax + Connecticut's 2%–6.99% state tax on 2026 1099 income.

Connecticut's brackets start at 2% and most gig workers pay an effective state rate around 4.5% to 5.5% — no city or town adds an income tax on top. The rule Connecticut freelancers get wrong is cross-border work: living in Stamford and driving in New York does not move your tax home. As a Connecticut resident you owe CT on all your 1099 profit, with a credit for any tax paid to New York on NY-source income.

Self-employed income & expenses

Estimate federal + SE + state tax for the 2026 tax year in one pass.

Annual 1099 income

Business miles driven

Other business expenses

Self-employed health insurance

Retirement contributions (SEP / Solo 401k)

W-2 income (if any)

Federal tax withheld

Filing status

State

Estimated total tax bill

$12,709

Refund / owed

-$12,709

Effective rate

21.2%

Detailed breakdown

Mileage deduction$5,600

Total business expenses$8,100

Net self-employment income$51,900

Self-employment tax (15.3%)$7,333

½ SE deduction (above-the-line)$3,667

Adjusted gross income$48,233

Taxable income$32,133

Federal income tax$3,608

State tax (est.)$1,767

Quarterly estimated payment$2,996

Marginal rate17.5%

Connecticut city tax rates for self-employed workers (2026)

Connecticut taxes self-employment profit through graduated brackets from 2% up to 6.99%, with no city or town income tax. Most gig workers land in the 4.5%–5.5% range, and Connecticut starts from federal adjusted gross income.

Local and state tax rates for self-employed residents of major Connecticut cities in 2026
City	Local rate	State rate	What gig workers should know
Hartford	No city income tax	2%–6.99%	State return only; the motor vehicle property tax is the local cost drivers actually feel.
New Haven	No city income tax	2%–6.99%	No local income levy; short-term rental hosts should check local registration rules.
Stamford	No city income tax	2%–6.99%	New York commuters: CT gives a credit for NY tax, but 1099 income as a CT resident is taxed by CT.
Bridgeport	No city income tax	2%–6.99%	State-only income filing.
Waterbury	No city income tax	2%–6.99%	State-only income filing.

Connecticut local and state filing deadlines

Q1 CT-1040ESApril 15, 2026
Connecticut estimates required if you expect to owe $1,000 or more of state tax.
Q2 CT-1040ESJune 15, 2026
Second installment.
Q3 CT-1040ESSeptember 15, 2026
Third installment.
Q4 CT-1040ESJanuary 15, 2027
Final installment for the 2026 year.
Connecticut CT-1040 returnApril 15, 2027
Resident return; Schedule C profit flows through federal AGI.
Q1 federal 1040-ESApril 15, 2026
Covers income earned January 1 – March 31.
Q2 federal 1040-ESJune 15, 2026
Covers April 1 – May 31.
Q3 federal 1040-ESSeptember 15, 2026
Covers June 1 – August 31.
Q4 federal 1040-ESJanuary 15, 2027
Covers September 1 – December 31.

Connecticut's brackets are graduated, but the benefit recap and phase-outs can push your marginal rate above the bracket you think you're in — run the numbers before a big quarter.
Connecticut taxes residents on all income, so a Stamford driver working New York still owes CT, with a credit for tax paid to New York on NY-source income.
No Connecticut town taxes income, but the motor vehicle property tax is a real cost for high-mileage drivers — it is not deductible as a business expense beyond the business-use share on Schedule C.

See every Connecticut tax form you need to file — annual, quarterly, and local →

Frequently asked questions

What is Connecticut's income tax rate for self-employed workers in 2026?: Graduated brackets from 2% up to 6.99%. Most gig workers with $30,000–$90,000 of net profit pay an effective Connecticut rate near 4.5% to 5.5%.
Do any Connecticut cities tax self-employment income?: No. Neither Hartford, New Haven, Stamford nor any other Connecticut municipality levies an income tax, so Form CT-1040 is your only state income tax return.
When are Connecticut quarterly estimated taxes due?: Form CT-1040ES payments are due April 15, June 15, September 15, 2026 and January 15, 2027. Connecticut requires estimates if you expect to owe $1,000 or more of state tax.
I live in Connecticut but drive Uber in New York — who taxes that income?: Both can. As a Connecticut resident you report all 1099 profit to Connecticut, and New York may tax the NY-source portion; Connecticut gives you a credit for tax paid to New York so you are not fully double-taxed.
How much should a Connecticut gig worker set aside for taxes?: About 27% to 33% of net profit covers federal income tax, the 15.3% self-employment tax and the Connecticut state layer together.
Does the mileage deduction lower my Connecticut tax?: Yes. Connecticut starts from your federal figures, so claiming the 2026 rate of $0.70 per business mile reduces both federal and Connecticut taxable income.