What the rule says
Kentucky is one of six states (with PA, NJ, MD, NE, IA) that imposes a state inheritance tax. Kentucky's framework, codified at Ky. Rev. Stat. § 140.080 et seq., uses class-based rates similar to Pennsylvania and New Jersey but with broader Class A exemption:
Class A (fully exempt)
- Surviving spouse - Parents - Children (biological and adopted) - Grandchildren and other lineal descendants - Siblings (Kentucky's distinctive feature — siblings are Class A) - Half-siblings (in some interpretations; verify) - Stepchildren of the decedent if treated as natural children
Class A pays 0% inheritance tax.
Class B (4% to 16%)
- Nephews and nieces - Half-siblings (per some interpretations) - Daughters-in-law and sons-in-law - Aunts and uncles - Great-grandchildren (in some interpretations)
Class B has a $1,000 exemption per beneficiary, then progressive rates from 4% to 16%.
Class C (6% to 16%)
- All other beneficiaries — friends, distant relatives, charitable beneficiaries that don't qualify for specific exemption
Class C has a $500 exemption per beneficiary, then progressive rates from 6% to 16%.
Why Kentucky's class structure matters
The distinctive feature of Kentucky's framework is the inclusion of siblings in Class A — fully exempt. Other inheritance tax states (PA, NJ) include siblings in the higher-tax classes:
- Pennsylvania: Siblings are Class C, paying 12% - New Jersey: Siblings are Class C, paying 11-16% - Kentucky: Siblings are Class A, paying 0%
Kentucky's inclusion of siblings as Class A reflects a distinctive policy choice — the state recognizes a closer relationship within the broader family unit than other inheritance tax states.
What this means in practice
Kentucky's class-based structure produces distinctive outcomes:
- $500,000 to a child (Class A): $0 tax - $500,000 to a sibling (Class A in KY): $0 tax (compare $52,250 in NJ, $60,000 in PA) - $500,000 to a niece (Class B): approximately $35,000-$50,000 tax - $500,000 to a friend (Class C): approximately $40,000-$60,000 tax - $500,000 to a charity (specifically exempt under § 140.080(2)): $0 tax
Kentucky has no estate tax
Kentucky has no state estate tax — only the inheritance tax applies. This is similar to Pennsylvania (inheritance tax only, no estate tax) and different from Maryland (both estate and inheritance tax).
Federal interaction
Kentucky inheritance tax operates alongside federal estate tax:
- Estates below federal exclusion ($13.99M in 2026): No federal estate tax. Kentucky inheritance tax may apply to non-Class A beneficiaries. - Estates above federal exclusion: Both federal estate tax and Kentucky inheritance tax may apply. - Charitable bequests reduce federal estate tax and incur no Kentucky inheritance tax (Class E).
Tax base
Kentucky inheritance tax has broad reach, including:
- All probate property - Revocable trust property - Joint accounts (decedent's contribution) - Beneficiary designation transfers - Pension and retirement benefits (with specific rules)
Life insurance is generally exempt under Kentucky law when payable to a beneficiary other than the estate.
What you can do about it
For Kentucky residents:
- Recognize the class-based structure. Plans should account for differing rates by intended beneficiary. - Use Class A for primary beneficiaries. Spouse, lineal descendants/ascendants, and siblings — all 0%. - Consider charitable bequests. Specifically exempt charities pay 0%. - Use life insurance for non-Class-A beneficiaries. Substantial tax efficiency. - Coordinate with overall estate planning.
For Kentucky residents with substantial wealth:
- Federal estate tax planning for estates above ~$13.99M. - Domicile considerations. Tennessee, Florida, Texas (no state inheritance tax) eliminate Kentucky exposure if domicile is properly established.
Who this affects most
Kentucky's inheritance tax framework is most consequential for:
- Kentucky residents with bequests to nieces, nephews, in-laws, or friends - Estate planners coordinating Kentucky-specific class structure - Kentucky residents with large estates approaching federal thresholds - Out-of-state advisors whose clients have moved to Kentucky
Kentucky's inheritance tax framework is among the more spouse-and-family-favorable inheritance tax structures in the country, with siblings as Class A representing a distinctive and unusual exemption.