Connecticut taxes for early retirees: generous breaks with an AGI cliff attached

By Tom, CPA · Updated October 29, 2026

TL;DR: Connecticut exempts Social Security, pensions and (starting in 2026) 100% of traditional IRA withdrawals, but only if federal AGI is under $75,000 (single) or $100,000 (joint), with phase-outs ending at $100,000 and $150,000. Above that, nearly everything is taxed at rates from 2% to 6.99%, plus phase-outs and recapture. Connecticut is also one of the few states with an estate tax, with a $15 million exemption in 2026.

Educational only, not tax, legal, or investment advice. Examples are illustrations, not predictions. Rules and limits change; verify current figures and talk to a qualified professional about your situation.

Connecticut has quietly become one of the friendlier states for modest-income retirees, which would shock anyone who has seen a Fairfield County property tax bill. Social Security, pensions and, starting in 2026, traditional IRA withdrawals can all be fully subtracted. The catch is that every one of those breaks is income-tested on federal AGI, and the phase-outs are steep enough to make a ski jumper nervous.

For FIRE folks, that means Connecticut rewards a low-AGI lifestyle and punishes big years. Let's follow Steady Stan, who keeps his income under $100,000, and Convert-It-All Carla, who did a $60,000 Roth conversion and learned about cliffs the hard way.

CPA Warning Label: Connecticut's retirement breaks are tied to federal AGI, so a single Roth conversion can wipe out the subtraction on all your other retirement income. At $150,000 of joint AGI, a couple can go from no Connecticut tax to over $7,000.

Income tax rates for 2026

DRS publication IP 2026(7) shows the 2026 rate schedule. For married couples filing jointly:

Single filers hit the same rates at half those thresholds: 2% up to $10,000, then 4.5%, 5.5% from $50,000, 6% from $100,000, 6.5% from $200,000, 6.9% from $250,000 and 6.99% above $500,000.

Connecticut also layers on income-tested features. There's a personal exemption ($24,000 joint, $15,000 single) that phases out by $1,000 for every $1,000 of income above $48,000 joint or $30,000 single. A 2% rate phase-out add-back claws back the benefit of the 2% bracket, up to $500 for joint filers, starting above $100,500. A recapture applies to higher incomes, starting above $210,000 joint. And a small personal tax credit disappears for joint filers at $100,500. Translation: Connecticut's real marginal rate can be higher than the bracket rate.

Social Security: free under the threshold, mostly free above

If federal AGI is under $75,000 (single or married filing separately) or $100,000 (joint, head of household or qualifying surviving spouse), Connecticut subtracts all of your federally taxable Social Security.

Above those amounts, the Social Security Benefit Adjustment worksheet limits the Connecticut-taxable portion to 25% of a figure based on your benefits. In plain English, Connecticut never taxes more than 25% of your Social Security, compared with up to 85% federally. That's not a cliff; it's a gentle slope.

Pensions, 401(k)s and IRAs: 100%, with an AGI catch

Connecticut lets you subtract 100% of qualifying pension and annuity income, including defined benefit pensions and 401(k), 403(b) and 457(b) distributions, if federal AGI is below $75,000 (single, married filing separately, head of household) or $100,000 (joint). The same thresholds apply to traditional IRA distributions, which were 75% deductible in 2025 and become 100% deductible starting in 2026, according to the legislature's research office. Roth IRA distributions aren't part of the calculation because they aren't federally taxable in the first place.

Above the threshold, the subtraction phases out on a schedule:

(Selected rows; the full schedule has steps every $2,500 or $5,000.) Military retirement pay and Railroad Retirement benefits are fully exempt without any income test, and Connecticut Teachers' Retirement System pay gets its own 50% subtraction.

Roth conversions show up as taxable IRA distributions and raise federal AGI, which can shrink the subtraction on all your retirement income. That's the cliff.

Illustration: Steady Stan vs. Convert-It-All Carla

Illustration (2026 rules from IP 2026(7) and the legislature's 2026 IRA percentage; both couples are 63, file jointly and have no Social Security yet): Stan and his wife withdraw $70,000 from traditional IRAs and earn $20,000 of interest and dividends. Federal AGI: $90,000.

• AGI is under $100,000, so 100% of the $70,000 IRA withdrawal is subtracted.
• Connecticut AGI: $20,000.
• Personal exemption: $24,000 (income under $48,000), which exceeds their income.
• Connecticut tax: $0.

Carla and her husband have the same $90,000, plus a $60,000 Roth conversion. Federal AGI: $150,000.

• At $150,000, the IRA subtraction is 0%, so the whole $130,000 of IRA money is taxable.
• Connecticut AGI: $150,000. Personal exemption: $0 (fully phased out above $71,000).
• Tax from the schedule: $4,000 + 5.5% x $50,000 = $6,750.
• 2% phase-out add-back at $145,500 and up: $500. Recapture: $0 (starts above $210,000).
• Connecticut tax: $7,250.

The $60,000 conversion cost Carla $7,250 in Connecticut tax, about 12% of the converted dollars. Had she spread the conversion so AGI stayed under $100,000 each year, the state bill could have stayed near zero. In Connecticut, smoothing income isn't a nicety; it's the whole strategy.

Property tax: the real Connecticut tax

Connecticut property taxes are set by each town's mill rate and are among the highest in the country, so they often matter more than the income tax for a retiree with a house. Look up the mill rate and the current assessment for any specific property.

Relief for older homeowners is income-tested. The state's homeowners program (the "circuit breaker") requires age 65 by the end of the prior year, and for the 2026 program, 2025 income of no more than $46,300 single or $56,500 married. Benefits range from $150 to $1,000 for singles and up to $1,250 for married couples, per the OPM booklet and town assessors. You apply with the local assessor between February 1 and May 15. Many towns also offer their own local senior relief.

Sales tax and estate tax

The general sales tax is 6.35%, with no extra local sales tax.

Connecticut is one of only a handful of states with an estate tax, and it's also the only state with a gift tax. For decedents dying in 2026, the exemption is $15 million, matching the federal basic exclusion, and the tax is 12% on amounts above it, according to the 2026 CT-706 NT instructions. Most FIRE households won't come near that, but if you do, Connecticut's estate tax is worth a lawyer's afternoon.

Residency and estimated payments

You're a Connecticut resident if you're domiciled there, or if you keep a permanent place of abode there and spend more than 183 days in the state. Movers file Form CT-1040NR/PY for the year of the move. Leaving for Florida? Connecticut looks closely at departures, so document the move.

Since January 1, 2025, payers of pensions and similar distributions aren't required to withhold Connecticut tax unless you ask with Form CT-W4P, per DRS. Lump-sum distributions are the exception: payers still withhold, at 6.99% by default. So retirees often need estimated payments (Form CT-1040ES) or a withholding request to avoid underpayment interest.

Moving is a two-state tax event, not a one-state one. Before you load the truck, read how to change your state residency without your old state following you, check how the federal Social Security tax torpedo interacts with your withdrawals, and run your numbers through the state tax move calculator.