A retired schoolteacher in Lexington dies, leaving her $480,000 estate split equally between her two children (Class A) and her younger sister (Class B). The children owe Kentucky nothing. The sister, who inherits $160,000, owes Kentucky approximately $14,500 in inheritance tax. The teacher hadn’t planned for this; the sister had no idea the tax existed. The Class B exposure on a modest inheritance is the kind of bill that surprises Kentucky families every year.

Kentucky is one of six states that still imposes an inheritance tax in 2026, alongside Maryland, Nebraska, New Jersey, and Pennsylvania.1The structure — a beneficiary-class system with full exemption for lineal relatives, partial exemption for siblings and in-laws, and minimal exemption for unrelated heirs — reflects a century-old design that prioritizes “family-line” inheritance and taxes transfers outside that line. For Kentucky families where the intended heir isn’t a child or lineal descendant, this is the tax that matters and the planning lever that closes most of the exposure.

This piece walks through the three-class structure, who pays what at typical inheritance values, the common edge cases (stepchildren, unmarried partners, half-siblings), and the four planning moves available to Kentucky families whose intended beneficiaries aren’t in Class A.

The three-class structure

The Kentucky statute under KRS 140.080 sorts every beneficiary into one of three classes based on relationship to the decedent. The class determination drives both the exemption amount and the rate schedule.

Class A: fully exempt

Class A includes:2

Class A inheritances are fully exempt from Kentucky inheritance tax regardless of value. A child inheriting $5 million from a parent owes Kentucky nothing. A spouse inheriting the entire estate owes Kentucky nothing. For the typical Kentucky family estate — passing to a surviving spouse and then to the children — the inheritance tax is simply not a factor.

Class B: $1,000 exemption, 4–16% rates

Class B includes:3

Class B beneficiaries pay tax on the inheritance value above $1,000. The rate is graduated by inheritance amount: roughly 4% on the first $10,000 over the exemption, climbing through 5%, 6%, and so on, reaching 16% on the largest inheritances. For an inheritance of $100,000 to a Class B beneficiary, the tax is approximately $5,000–$5,500. For $250,000, approximately $20,000. For $500,000, approximately $55,000.

Class C: $500 exemption, 6–16% rates

Class C includes everyone not in Class A or B:4

Class C beneficiaries pay tax on the inheritance value above $500. The rate schedule starts at 6% (higher than Class B’s 4%) and reaches the same 16% top rate. For an inheritance of $100,000 to a Class C beneficiary, the tax is approximately $6,500. For $250,000, approximately $24,000. For $500,000, approximately $60,000.

The common edge cases

Several family structures don’t fit neatly into the three-class system, and the determinations have dollar consequences.

Stepchildren

As of 1998, stepchildren and stepgrandchildren are Class A — fully exempt. Pre-1998, they were Class C, which created harsh outcomes for blended families. The 1998 amendment retroactively applies for deaths on or after the effective date. If your parent has stepchildren they intend to treat as children for inheritance purposes, the law now aligns with that intent without any additional adoption or designation step.

Half-siblings

Half-siblings are Class B alongside full-blood siblings, despite some historical confusion. The statute lists “brothers and sisters of the half blood” explicitly in Class B. A half- sibling inheriting $200,000 pays Class B rates ($11,000–$12,000 of tax).

Unmarried domestic partners

Kentucky does not recognize common-law marriage (with limited grandfathered exceptions). An unmarried partner of any duration is Class C for inheritance purposes — the highest exposure category. This is the area where Kentucky’s inheritance tax most diverges from social expectation: a 30-year unmarried partner inherits at the same Class C rate as a stranger. For unmarried couples in Kentucky who intend to leave assets to each other, this is the planning conversation that matters most.

Adopted-after-majority children

Adult adoption in Kentucky converts a Class B or C relationship to Class A. Couples who pursued adult adoption to formalize a parent-child relationship (including pre-2015 same-sex couples in Kentucky who used adult adoption to create legal kinship) receive Class A treatment for inheritance purposes. The mechanism is unusual and now mostly historical (marriage equality replaced most use cases), but it remains operative for the families who used it.

The decedent’s domicile

The Kentucky inheritance tax applies to the estates of Kentucky residents (and to Kentucky-situs real and tangible property of non-residents). A long-time Kentucky resident who moves to Tennessee (no inheritance tax) and dies there as a Tennessee resident generally is not subject to Kentucky inheritance tax on intangible assets. Domicile is a fact question requiring more than just a change of address; voter registration, driver’s license, primary residence, and tax filings all contribute. For Kentucky families considering relocation for any reason, the inheritance-tax consequence is one of the factors worth considering.

Filing mechanics and timing

The Kentucky Inheritance and Estate Tax Return (Form 92A200) is required whenever any Class B or C beneficiary inherits more than the applicable exemption.5 Key procedural facts:

The return is filed with the Kentucky Department of Revenue. For straightforward estates with all Class A beneficiaries, no return is required — even if the federal estate-tax return is filed.

The four planning moves

For Kentucky families whose intended heirs aren’t all Class A, four planning approaches close most of the exposure.

1. Lifetime gifting (no state gift tax)

Kentucky has no state gift tax. The federal annual- exclusion gift ($18,000 per recipient per year in 2024, indexed) and lifetime exemption gift can be made to Class B or C beneficiaries during life without triggering any Kentucky tax. For a Kentucky parent who intends to leave significant assets to a sibling, niece, or unmarried partner, a sequence of annual-exclusion gifts over 5–10 years can move material wealth outside the inheritance-tax base. The federal gift-tax rules apply, but for gifts within the federal annual exclusion or the lifetime exemption, no federal tax is due either.

2. Beneficiary designations for retirement accounts and life insurance

Kentucky inheritance tax reaches assets that pass to named beneficiaries (a TOD account, an IRA with a named beneficiary, a life-insurance death benefit). The tax is not avoidable by using TOD designations alone; the recipient’s class still drives the tax outcome. However, certain configurations — particularly using life insurance to provide a non-Class-A beneficiary with a tax-equivalent amount — can be efficient when the insured can obtain coverage. The life-insurance approach essentially “grosses up” the inheritance to cover the tax liability.

3. Irrevocable trusts established more than three years before death

Assets transferred to an irrevocable trust during life are generally outside the Kentucky inheritance- tax base for the donor’s subsequent death, subject to certain look-back provisions for transfers within three years of death and for transfers where the donor retained interests. The mechanism is professional-grade planning that requires careful drafting, but for Kentucky families with significant Class B or C exposure, an irrevocable trust funded well before death can functionally eliminate the Kentucky inheritance- tax liability on the trust assets.

4. Charitable planning for the planned charitable gift

For Kentucky families that intend to leave portions of their estate to charity, the KRS 140.060 charitable exemption makes those gifts fully Kentucky-tax-free. A bequest to a qualifying charity is more tax-efficient than an equivalent gift to a Class B or C beneficiary. For families balancing charitable intent against family inheritance, the Kentucky inheritance-tax structure tilts the math in favor of charitable planning relative to states without an inheritance tax.

The Medicaid recovery angle

Kentucky also runs a Medicaid estate-recovery program under federal authority for Medicaid LTC services. The recovery operates separately from the inheritance tax but on the same probate estate. For Kentucky parents who used Medicaid LTC, the recovery can functionally consume the inheritance before the inheritance tax ever applies. Probate- avoidance structures — revocable trusts, TOD deeds, named beneficiaries on financial accounts — reduce both the recovery base and (in some configurations) the inheritance-tax exposure simultaneously.

What to do for an at-risk Kentucky family

If you have a Kentucky parent whose intended heirs include non-Class-A beneficiaries:

The bottom line

Kentucky’s inheritance tax is one of the oldest continuously-imposed state-level transfer taxes in the country, and the Class A/B/C structure has produced fairly predictable outcomes for over a century. For Kentucky families where the intended heirs are all Class A — the surviving spouse and the children — the tax is a non-issue. For families where the intended heirs include siblings, nieces and nephews, in-laws, or unrelated partners, the tax is real and can run into tens of thousands of dollars on modest inheritances. The planning toolkit is standard and effective; the missed opportunity is almost always the family that didn’t realize the tax existed until the personal representative confronted the 18-month deadline. If your Kentucky parent’s estate plan was drafted without attention to non-Class-A beneficiaries, that’s the conversation worth having this year — while the planning runway is still long enough to execute.6