Connecticut Income Tax Guide 2026: Rates, Brackets, Exemption and the Add-Back
This Connecticut income tax guide 2026 explains the rates, brackets, exemption phase-out, and the add-back.
Connecticut taxes income in seven brackets from 2% to 6.99% — but the bracket table is only half the story. There is no standard deduction, the personal exemption phases out fast, and a “2% add-back” quietly adds to the bill as income rises. A single filer at $75,000 owes $3,475, not the $3,375 the brackets alone suggest.
This guide answers the questions Connecticut taxpayers actually ask: the 2026 rates and brackets, why there is no standard deduction, how the exemption phase-out works, and what the add-back and recapture do to your bill. Run your own numbers with the free Connecticut income tax calculator.
What are Connecticut’s income tax rates in 2026?
Connecticut has seven rates in 2026: 2%, 4.5%, 5.5%, 6%, 6.5%, 6.9%, and 6.99%. Single filers pay 2% on the first $10,000, 4.5% up to $50,000, 5.5% up to $100,000, 6% up to $200,000, 6.5% up to $250,000, 6.9% up to $500,000, and 6.99% above that. Joint brackets are twice as wide, with the top rate starting at $1,000,000.
The current rates took effect in 2024, when the two lowest rates fell from 3% to 2% and from 5% to 4.5%. Unlike most states, Connecticut does not adjust its thresholds for inflation — the same dollar thresholds have applied for years, which means inflation quietly pushes more income into higher brackets over time.
Does Connecticut have a standard deduction?
No. Connecticut provides no general standard deduction and does not allow the federal itemized total on the state return. Instead, Form CT-1040 starts with federal adjusted gross income, applies Connecticut additions and subtractions, and then allows an income-based personal exemption. That exemption is the only broad deduction most filers get — and it disappears quickly.
Single filers get up to $15,000 ($24,000 joint, $19,000 head of household), but it shrinks by $1,000 for every $1,000 of Connecticut AGI above the threshold and is worth $0 above $44,000 single ($71,000 joint). For most middle-income earners, taxable income simply equals AGI — which is why a $75,000 earner is taxed on the full $75,000.
What is the 2% add-back?
The 2% add-back (Table C) claws back the benefit of the 2% bracket as income rises. It starts above $56,500 of AGI for single filers ($100,500 joint) and grows in steps to a maximum of $250 single ($500 joint). At $75,000 single it adds $100; at $100,000 it adds $225; at $150,000 joint it is at the $500 maximum.
This is the adjustment most Connecticut calculators get wrong by omitting it. The Connecticut income tax calculator includes it, so its results match the published 2026 worked examples: $3,475 at $75,000 single and $7,250 at $150,000 joint. Above $105,000 single ($210,000 joint), a separate benefit recapture (Table D) adds further tax — that one is flagged, not modeled.
How much Connecticut tax do you pay on $75,000?
A single filer with $75,000 of Connecticut AGI owes $3,475 for 2026 — an effective rate of 4.63%. The exemption is fully phased out, so taxable income is the full $75,000: $200 at 2%, $1,800 at 4.5%, $1,375 at 5.5%, plus the $100 add-back. At $100,000 the bill is $4,975 (4.98% effective), and at $150,000 it is $8,225.
- Connecticut AGI: $75,000
- Personal exemption: $0 (phased out)
- Tax from brackets: $3,375.00
- 2% add-back: $100.00
- Total Connecticut tax: $3,475.00
- Effective rate: 4.63%
Note the marriage penalty hiding in the add-back: a couple earning $75,000 each owes $7,250 jointly, versus $6,950 as two single filers — $300 more, even though joint brackets are twice as wide. The couple’s $500 add-back exceeds the two singles’ combined $200.
Do Connecticut towns charge income tax?
No. No Connecticut municipality levies a personal income tax, so Form CT-1040 is the only income-tax return. That beats Maryland or Ohio, where a county or city layer adds several percentage points. Connecticut’s local-tax story is property tax, averaging 1.54% of home value, among the highest in the nation, with Hartford County rates above 2%.
For commuters, the two-state picture matters more than any town tax: Connecticut taxes residents on all income, and New York taxes New York-source income. You file a New York nonresident return and claim a credit on the Connecticut return, so the same income is not fully taxed twice — but the filing is among the most complex in state tax.
How does Connecticut compare to New York and Massachusetts?
At $75,000 single, Connecticut’s $3,475 sits almost on top of New York’s $3,453 and Massachusetts’s $3,530 — within $55 of both neighbors. It is $879 more than New Jersey ($2,596) and $1,279 more than Rhode Island ($2,196). The comparison excludes local taxes, which is where New York City’s additional tax would change the picture for city residents.
The deeper difference is structural: Massachusetts charges a flat 5% (plus a 4% surtax above about $1.1 million), while Connecticut’s graduated system plus add-back and recapture produces a rising effective rate — 3.60% at $50,000, 4.63% at $75,000, 4.98% at $100,000, 5.48% at $150,000. High earners face the steepest climb. Compare directly with the New York income tax calculator and the state income tax calculator hub.
What else do Connecticut taxpayers ask?
When is my 2026 Connecticut return due?
April 15, 2027. Connecticut returns are filed on Form CT-1040, and estimated payments on Form CT-1040ES are due April 15, June 15, September 15, 2026, and January 15, 2027, if you expect to owe $1,000 or more.
Does Connecticut have an earned income credit?
Yes. The refundable Connecticut EITC equals 40% of the federal credit for qualifying full-year residents, plus an additional $250 for taxpayers with at least one qualifying child. It is claimed on Schedule CT-EITC and is not included in the basic calculator.
Is Social Security taxed in Connecticut?
Partly. Social Security benefits are fully exempt below certain AGI thresholds (around $75,000 single and $100,000 joint), with a portion becoming taxable above them. The exact thresholds and phase-in should be confirmed with CT DRS for the year you file.
Does Connecticut offer a dependent exemption?
No separate fixed exemption per dependent. Qualifying children mainly matter through the Connecticut EITC and the federal child-related credits, not through a Connecticut exemption amount.
Estimates only — not tax advice. Verify with the Connecticut Department of Revenue Services or a tax professional.
