Connecticut
Reviewed June 2026Federal §453 conformity
Yes. Connecticut starts from the federal return, so installment gain is reported as payments arrive at rates up to 6.99%. Connecticut's complications live elsewhere — in the arithmetic of its pass-through election and in a transfer-tax system unlike any other state's.
Nonresident sourcing
Gain from Connecticut real estate or a business carried on in Connecticut is Connecticut income for sellers anywhere, and each installment payment keeps that character. Gain from intangibles such as stock generally follows the seller's home state.
Withholding
Connecticut imposes no closing-table withholding on nonresident sellers of real estate. What arrived with the 2024 pass-through overhaul is a composite-return requirement: the entity files and pays for nonresident owners whose only Connecticut income runs through it — which quietly covers each installment year the entity recognizes gain.
Selling, then moving (residency change)
Connecticut-source gain stays taxable here after a move; other gain travels with the seller, and there is no New York-style rule accelerating deferred gain at the border. The practical exposure is the residency tests themselves — 183 days plus a Connecticut home makes a statutory resident of someone who thinks they've left — and the fact pattern is common, since so many Connecticut sellers straddle the New York line.
Pass-through entity (PTE) tax election
Connecticut invented the PTE tax and ran it as the country's only mandatory version through 2023; it has been a true annual election since 2024. Two features drive the math. First, the credit is 87.5 cents per dollar of entity tax — a permanent 12.5% haircut, so the election pays only when the federal deduction is worth more than what the haircut costs. Second, the election, once made for a year, is irrevocable for that year, and the base the entity is taxed on depends on who the owners are — a resident-heavy company and a nonresident-heavy one can get very different answers from the same gain. Run the numbers each payment year; do not set and forget.
Estate and IRD
Connecticut's estate tax exemption now rides the federal number — $15 million in 2026 — with a flat 12% above it and a ceiling: combined gift and estate tax can never exceed $15 million. The trap has moved: Connecticut is the only state in the country with a gift tax, so the pre-sale gifting strategies that work cleanly everywhere else — moving entity interests to children or trusts before closing — have a state-level cost or use up state exemption here. And the estate tax clock runs fast: payment is due six months after death, not the federal nine.
Planning notes
Four Connecticut items to settle early: run the 87.5%-credit math before assuming the PTE election helps, and re-run it every payment year; check any pre-sale gifting plan against the state gift tax before signing; map the New York overlap if the seller lives or works across the line; and if the estate plan matters, remember the six-month clock and that spouses cannot share the exemption without trust work.
Connecticut's PTE credit returns only 87.5% of the entity-level tax to the owners — a permanent 12.5% haircut. The election makes sense only when the federal deduction is worth more than the haircut costs, and that comparison can flip from one payment year to the next. Model it annually.
Pre-sale gifting of entity interests — routine planning in 49 other states — has Connecticut gift tax consequences or consumes Connecticut exemption. Check the transfer plan against the state gift tax before closing, not after.
Educational information, current as of the June 2026 review. State law changes; confirm treatment with a qualified advisor before structuring a transaction.
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