Connecticut Estate Tax Calculator
Connecticut levies a state estate tax that applies once the taxable estate exceeds its exemption.
Direct answer
Connecticut has a state estate tax in 2026 with a $15,000,000 exemption and a top rate of 12.0%. The federal estate tax is calculated separately and applies above the $15M exemption (OBBBA, P.L. 119-21). Source: Conn. Gen. Stat. § 12-391 — exemption tied to federal basic exclusion amount (5,000,000 in 2026 per IRS Rev. Proc. 2025-32); flat 12% on the excess since 2023 (2026; retrieved 2026-08-11).
Connecticut Estate Tax Calculator — Calculation Summary
| Input / parameter | Value |
|---|---|
| State | Connecticut |
| Taxable estate | $22,500,000 |
| Result | |
| Federal estate tax | $2,945,800 |
| Connecticut state estate tax | $2,945,800 |
| Total estate tax | $5,891,600 |
Source: Conn. Gen. Stat. § 12-391 — exemption tied to federal basic exclusion amount (5,000,000 in 2026 per IRS Rev. Proc. 2025-32); flat 12% on the excess since 2023 (2026).
This is an informal planning estimate only, not legal or tax advice. Confirm all figures with the IRS, your state Department of Revenue, or a licensed estate attorney or CPA before relying on them.
State dollar amount is a model estimate — verify with the Connecticut Department of Revenue.
Source: Conn. Gen. Stat. § 12-391 — exemption tied to federal basic exclusion amount (5,000,000 in 2026 per IRS Rev. Proc. 2025-32); flat 12% on the excess since 2023 (2026)
Administration & filing in Connecticut
- Who pays: The estate pays the tax before distribution to heirs.
- Where filed: With Connecticut's tax authority (typically the Department of Revenue or Taxation), on a state estate/inheritance tax return.
- Deadline: State returns generally follow the federal estate tax return timeline (IRS Form 706, due ~9 months after death, with a 6-month extension available), but state dates can differ — confirm with the state agency.
- Citation: Conn. Gen. Stat. § 12-391 — exemption tied to federal basic exclusion amount (5,000,000 in 2026 per IRS Rev. Proc. 2025-32); flat 12% on the excess since 2023 (2026)
Related tools & comparisons
- Federal estate tax calculator — the $15M exemption and 2026 numbers
- Gift tax calculator — annual $19,000 exclusion and lifetime exemption use
- Step-up in basis calculator — what heirs' cost basis resets to
- Safe-zone planner — how much can pass free of estate tax
- Relocation planner — compare estate tax after moving to a no-tax state
- No-tax states list — the 33 states without estate or inheritance tax
Informal estimate only — not legal or tax advice. Figures cite federal statute (IRC § 2010, OBBBA 2025) and each state's Department of Revenue. Tax laws and exemption amounts change yearly; confirm the current rule with the IRS, your state agency, or a licensed estate attorney or CPA before relying on any number.
How this calculator works
Calculation method & sources
- Federal tax: IRC § 2010(c)(3) exemption of $15M per person and IRC § 2001 graduated brackets.
- Connecticut tax: Conn. Gen. Stat. § 12-391 — exemption tied to federal basic exclusion amount (5,000,000 in 2026 per IRS Rev. Proc. 2025-32); flat 12% on the excess since 2023 (2026).
How to interpret your Connecticut estate tax result
- Connecticut estate tax applies once the taxable estate exceeds $15,000,000.
- Top state rate: 12.0%.
- Connecticut does not recognize portability; married couples should consider a credit-shelter trust to use both exemptions.
- Federal estate tax is calculated separately and may apply above the $15M federal exemption.