About the Inheritance Tax Calculator
The State Inheritance Tax Calculator estimates what a beneficiary might owe on money or property they inherit, based on the amount received and their relationship to the person who died. Unlike the federal estate tax, which is paid by the estate itself before assets are distributed, inheritance tax is assessed on each heir individually and only exists in a small number of US states. This tool is useful for getting a rough sense of how much relationship status alone can change what an heir keeps.
How It Works
You enter the amount inherited and select a relationship category: spouse, child or grandchild, sibling, or other/unrelated. The calculator looks up a representative rate and exemption for that relationship, subtracts any exemption from the inherited amount, and applies the rate to what remains. Spouses are treated as fully exempt regardless of amount, while more distant or unrelated heirs face higher rates on the full inherited sum.
Formula & Methodology
For a child or grandchild inheriting $100,000 with a $0 exemption in this model, the full $100,000 is taxable at 4.5%, producing $4,500 owed. For a sibling inheriting the same amount, the rate jumps to 12% for $12,000 owed, and an unrelated heir would owe $15,000 on that same inheritance under the 15% rate used here, illustrating how sharply relationship changes the outcome even when the dollar amount is identical.
Examples
Child inheriting $100,000
A child or grandchild inheriting $100,000 falls under the 4.5% rate with no exemption in this model, producing an estimated inheritance tax of $4,500.
Sibling inheriting $250,000
A sibling inheriting $250,000 falls under the 12% rate, producing an estimated $30,000 in inheritance tax, roughly 2.7 times the dollar amount a child would owe on the same sum.
Advantages
- Shows how dramatically the relationship to the deceased, not just the dollar amount inherited, changes the estimated tax owed.
- Gives a quick side-by-side sense of spouse, child, sibling, and unrelated-heir outcomes without needing to look up a specific state's bracket table.
- Useful as a starting point before consulting your actual state's inheritance tax schedule, since it isolates the relationship variable clearly.
Common Mistakes
- Confusing inheritance tax with the federal estate tax; the estate tax is paid by the estate before distribution and only applies above a large federal exemption, while inheritance tax is paid by the individual heir and exists only in certain states.
- Assuming every state has an inheritance tax, when in fact only a small number currently impose one, so this calculator may not apply at all depending on where the deceased lived or owned property.
- Overlooking that real state statutes often include a modest exempt threshold even for non-spouse relatives, which this simplified model, using a $0 exemption for child, sibling, and other categories, does not replicate.
Edge Cases to Watch For
- A spouse relationship carries an unlimited exemption in this model, so the calculated tax is always $0 no matter how large the inheritance, reflecting that most states with an inheritance tax fully exempt surviving spouses.
- Child, sibling, and other categories all use a $0 exemption here, so tax applies from the first dollar inherited; some actual state schedules carve out a small exempt amount for close relatives that this simplified model does not include.
- Because only a handful of states impose an inheritance tax at all, and rates and exemptions vary by state, the figures used here are representative estimates, not a specific state's actual statute.
Common Use Cases
- An heir trying to estimate a rough tax bill before assets are distributed from an estate located in a state that taxes inheritances.
- An estate planner illustrating to a client how naming different beneficiaries could change the tax outcome for heirs.
- Someone comparing how much more a non-relative or distant relative would owe compared to a direct descendant on the same inherited amount.