Connecticut Capital Gains Tax, Explained

The federal system rewards patience: hold an asset over a year and your rate drops to 0%, 15%, or 20%. Connecticut ignores the holding period completely. A gain from a stock held for ten years and a flip held for two months land on the same line of your Connecticut return and climb the same bracket ladder as your salary.

Connecticut runs seven brackets, from 2% on the first slice of income up to 6.99% on taxable income over $500,000 for single filers (over $1,000,000 for joint filers). The bottom two brackets were cut in a 2024 relief package, the first rate reduction in decades, but that relief phases back out for higher earners through the recapture rule covered next. Most working professionals with a modest gain land in the middle brackets; a large one-time sale, a business exit, a concentrated stock position, an inherited property, typically pushes the household into the 6.9% or 6.99% band for that year.

Connecticut does not currently have a separate surcharge on capital gains or investment income. Lawmakers have proposed one more than once, most recently a 1.75% surcharge on capital gains and dividend income for single filers with income over $1 million and joint filers over $2 million. That proposal did not survive the final budget process and is not current law as of this writing. It has come up in more than one legislative session, so it is worth re-checking before you finalize a large sale, but do not plan around a tax that does not exist yet.

What Connecticut does have, and what surprises even sophisticated sellers, is a two-part benefit recapture built into the regular bracket calculation. It is not labeled a surtax anywhere, so it rarely shows up in a plain-English rate table, but it functions like one for anyone with a large gain:

• First recapture. Once Connecticut AGI passes $105,000 (single) or $210,000 (joint), a phase-out add-on starts clawing back the benefit of the 2024 rate cut, capped at a modest fixed dollar amount per filer.
• Second recapture, the one that matters for a big sale. Once Connecticut AGI passes $200,000 (single) or $400,000 (joint), a second, larger add-on phases out the benefit of every bracket below 6.9%. By the time Connecticut AGI clears roughly $500,000 single or $1,000,000 joint, essentially all of the taxpayer's income, including the gain, is taxed at something close to the flat 6.99% top rate.

Connecticut's tax stacks on top of, not instead of, the federal capital gains system. Long-term gains still get the federal 0%, 15%, or 20% rate depending on total taxable income, and the 3.8% Net Investment Income Tax applies once modified adjusted gross income clears $200,000 for single filers or $250,000 for married filing jointly. Short-term gains, held one year or less, get no discount at any level: ordinary federal brackets up to 37% plus Connecticut's ordinary brackets up to 6.99%.

Because Connecticut's income tax starts from federal AGI, the two systems are linked in one more practical way: a valid federal deferral, an installment sale or a Section 1031 like-kind exchange, carries through to the Connecticut return automatically. There is no separate Connecticut election required for either strategy.

Because Connecticut's tax base starts with your federal AGI, the federal Section 121 exclusion for a primary residence, $250,000 single, $500,000 married filing jointly, flows through automatically. Any gain above the exclusion, common in Fairfield County and the Gold Coast towns where appreciation has been steep, gets added to Connecticut AGI and taxed at your regular bracket rate, with the recapture rule above deciding whether that rate is a middle bracket or effectively the flat 6.99% top rate.

The same pass-through applies to rental property depreciation recapture. Connecticut does not have a separate rate for unrecaptured Section 1250 gain the way the federal system does (capped at 25% federally); it simply taxes whatever shows up in your federal AGI at your ordinary Connecticut bracket rate. Weighing a sale against holding the property as a rental has its own set of trade-offs, covered in Should You Sell or Rent Your House?

Investment real estate sellers looking to defer the gain entirely, in Connecticut and federally, should look at a 1031 exchange, which Connecticut recognizes automatically through its federal AGI starting point.

Fairfield County, Greenwich, Darien, New Canaan, Westport, and Stamford in particular, has one of the highest concentrations of hedge fund managers and finance executives in the country, and a well-documented pattern of those same households establishing residency in Florida ahead of a major liquidity event. No state income tax on either wages or capital gains is the entire draw, and it is why firms and their principals have moved headquarters and personal residency south together in some well-publicized cases.

Connecticut real estate stays Connecticut-source no matter where you live when you sell it. Intangible gains, stock, a fund interest, a business sale, are generally taxed by your state of residence at the time of sale, which means a genuine, well-documented move to Florida completed well before the transaction can take Connecticut out of the picture entirely for that gain.