2026 tax year · Connecticut
Quarterly tax calculator for Connecticut
A $50,000 1099 year in Connecticut means about $2,190 to the IRS and $414 to the state, four times a year.
Switching state opens that state's page.
Line 24 of your prior 1040, unlocks the prior-year safe harbor.
Above $150,000 the prior-year target rises to 110%.
Enter what you expect to earn and press Calculate to see each payment.
The Connecticut payment schedule on $50,000
A single filer with $50,000 of net 1099 profit, taking the standard deduction and paying 90% of this year's liability:
| Due | Income earned | To the IRS | To Connecticut |
|---|---|---|---|
| April 15, 2026 | Jan 1 - Mar 31 | $2,190 | $414 |
| June 16, 2026 | Apr 1 - May 31 | $2,190 | $414 |
| September 15, 2026 | Jun 1 - Aug 31 | $2,190 | $414 |
| January 15, 2027 | Sep 1 - Dec 31 | $2,190 | $414 |
| Year | $8,759 | $1,657 | |
The Connecticut side of each payment
Connecticut taxes the same 1099 profit on 7 graduated brackets topping out at 6.9%, so a second payment goes to the state each quarter, about $414 on the $50,000 example, against $1,841 of Connecticut income tax for the year.
The 2026 dataset carries the federal 1040-ES dates but not state-specific due dates, so confirm Connecticut's schedule and voucher with its tax agency, several states do not match the federal calendar exactly.
What each quarter costs at three income levels in Connecticut
A single filer taking the standard deduction, at three levels of net profit. The federal column moves with the self-employment tax and the federal brackets; the Connecticut column moves with Connecticut's own rules, so the two do not scale together. Use the calculator above for the other filing statuses:
| Net 1099 profit | Per quarter to the IRS | Per quarter to Connecticut | Effective rate |
|---|---|---|---|
| $25,000 | $923 | $179 | 19.6% |
| $50,000 | $2,190 | $414 | 23.1% |
| $100,000 | $5,032 | $981 | 26.7% |
Staying inside the safe harbor
Payments are required once you expect to owe $1,000 or more, which the $50,000 example above does, at $11,573 for the year. Two targets avoid a penalty and you need only the lower; the hub explains both routes and the penalty.
What the rate alone doesn't tell you about Connecticut
Connecticut is one of the twelve states that still taxes Social Security benefits, which matters if you are drawing benefits alongside self-employment income.
What a quarter costs in the states Connecticut borders
On $50,000, Connecticut charges $2,000 of state income tax. Of the 3 states it borders, Rhode Island is the lightest at $1,875 and Massachusetts the most expensive at $2,500, a spread of $625 on the same income.
| State | State tax per quarter | vs Connecticut |
|---|---|---|
| Rhode Island | $422 | −$28 a quarter |
| New York | $561 | +$111 a quarter |
| Massachusetts | $563 | +$113 a quarter |
- Rhode Island would take $125 less, $1,875 against Connecticut's $2,000.
- New York would take $495 more, $2,495 against Connecticut's $2,000.
- Massachusetts would take $500 more, $2,500 against Connecticut's $2,000.
What this schedule assumes
- Single filer, standard deduction, net 1099 profit after expenses, no W-2 withholding.
- Four equal payments rather than annualised income.
- Connecticut due dates are not in the 2026 dataset, the dates shown are the federal ones.
Connecticut quarterly tax questions
How much should I send each quarter in Connecticut?
On $50,000 of net 1099 profit as a single filer, about $2,190 to the IRS plus roughly $414 to Connecticut. That is 90% of this year's liability, split four ways.
Does Connecticut use the same due dates as the IRS?
Connecticut requires its own estimated payments, but the 2026 dataset carries only the federal 1040-ES dates (April 15, 2026, June 16, 2026, September 15, 2026, January 15, 2027). Confirm Connecticut's own schedule with its tax agency before assuming they line up.