State Estate Tax vs Federal Estate Tax

A state estate tax vs federal estate tax distinction matters because state-level estate taxes can apply at far lower thresholds than the federal exemption, meaning an estate can face no federal tax while owing substantial state tax liability.

The core difference: two separate tax systems

Federal estate tax applies to the total estate value above $13.61 million (as of 2024–2025), at a flat 40% rate. But this federal floor does not stop state estate taxes. States that impose an estate or inheritance tax operate independently—they set their own exemption thresholds, rates, and rules. An estate worth $3 million faces zero federal tax yet might owe $300,000+ in state estate tax if the owner lived in a high-tax state like Massachusetts (exemption: $1 million) or New York ($6.94 million threshold as of 2024). Conversely, states with no estate tax (Florida, Texas, Wyoming, and 12 others) collect nothing, while their residents’ estates are only exposed to federal tax if the estate exceeds the federal exemption.

This dual system creates a state-only tax exposure that is often overlooked. High-net-worth individuals planning across state lines must model both thresholds separately.

Which states impose an estate or inheritance tax?

Twelve states plus D.C. currently levy a separate estate tax: Connecticut, Delaware, Illinois, Iowa, Kentucky, Maine, Maryland, Massachusetts, Minnesota, New York, Ohio, Oregon, Rhode Island, Vermont, and Washington. Several additional states impose an inheritance tax (a tax on the heirs who receive property), which is a different structure but similar economic effect. Nebraska and New Jersey impose inheritance tax. The specifics—rates, exemptions, and whether spousal transfers are exempt—vary widely. For example:

• Massachusetts: 0.8–16% estate tax; $1 million exemption
• New York: 3.06–16% estate tax; $6.94 million exemption
• Oregon: 0.8–16% estate tax; $1 million exemption
• Washington: 10–20% estate tax; $2.193 million exemption (with stepped-up basis recapture)

Two states—Kentucky and New Jersey—sunset their estate/inheritance taxes for decedents dying after specific dates, but estates of prior decedents remain exposed during the wind-down period.

How state and federal taxes interact

The federal and state taxes are calculated independently. A $10 million estate in New York, for instance, pays zero federal tax (below the $13.61 million threshold) but owes New York state estate tax on the amount exceeding $6.94 million—roughly $196,960 at New York’s top rate. The same estate in Florida owes nothing to either.

Portability is a federal benefit allowing a surviving spouse to inherit the deceased spouse’s unused exemption, effectively doubling the couple’s combined exemption to $27.22 million. However, portability is a federal feature only. Many states do not recognize portability or restrict it. A surviving spouse in Massachusetts cannot port the deceased spouse’s unused exemption for Massachusetts estate tax purposes unless the state has explicitly adopted portability rules (Massachusetts does not).

Stepped-up basis and state alternatives

Several states have created their own “stepped-up basis recapture” rules, most notably Washington. Under Washington’s estate tax, even though appreciated assets receive a stepped-up basis (resetting capital gains tax), Washington imposes a separate 10–20% tax on the unrealized gain. This effectively creates a second layer of tax on appreciated assets in addition to any federal estate tax. Other states like Oregon and Minnesota are considering similar approaches.

Planning implications

Estate planning across state lines requires checking both the state exemption and the federal exemption. An individual with a $5 million estate might assume no estate tax, but if they live in Massachusetts, Connecticut, or Maine, they face state estate tax on the amount above their state’s exemption. Conversely, someone in a no-tax state can defer estate tax planning until the estate approaches the federal threshold.

Relocation before death can eliminate state estate tax exposure if done with proper intent and timing. Moving to a no-tax state and establishing domicile there (driver’s license, voter registration, bank accounts) prior to death removes the decedent from the prior state’s tax net. However, partial-year residents and those with significant in-state property may still face exposure in some states.

Unified credit and exemption cliff planning becomes more complex in high-tax states. The federal exemption is scheduled to sunset in 2026, dropping to approximately $7 million, effectively doubling the federal tax burden on estates above that new threshold. But state exemptions are generally scheduled to remain stable, meaning the state-federal gap will widen.

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