What This Calculator Estimates
This calculator estimates inheritance tax by subtracting the allowance you enter from the estate value and applying the tax rate you enter to the remaining taxable amount. It is useful for rough estate-planning scenarios, not for final probate or filing work.
Formula / Method Used
- Taxable estate = max(estate value - tax-free allowance, 0).
- Estimated inheritance tax = taxable estate x tax rate.
- The page does not automatically add gift rules, spousal exemptions, residence reliefs, or charitable reductions.
Worked Example
If the estate value is $800,000, the allowance is $325,000, and the tax rate is 40%, the taxable estate becomes $475,000. Applying the 40% rate gives an estimated inheritance tax bill of $190,000.
What the Result Means
The main result is the estimated tax bill based on the allowance and rate you supplied. The supporting line shows the amount treated as taxable after the allowance has been removed.
Common Mistakes
- Assuming every estate uses the same tax-free threshold.
- Ignoring lifetime gifts, spouse transfers, residence reliefs, or charitable exemptions.
- Using a general estimate in place of estate-specific legal or tax advice.
Official References
For UK guidance, review GOV.UK on how Inheritance Tax works. Verify current rates with the official government source that applies to the estate you are reviewing.
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Frequently Asked Questions
What does this inheritance tax calculator estimate?
It estimates the taxable estate after the allowance you enter and then applies the tax rate you choose.
Does the page automatically apply every inheritance-tax relief?
No. It is a simplified estimate and does not automatically model every exemption, relief, or gift rule.
What should I enter as the allowance?
Enter the tax-free threshold you want to test for your scenario, based on the rules that apply to the estate you are reviewing.
Should I verify current official rules before relying on the result?
Yes. Inheritance-tax rules can depend on jurisdiction, estate structure, and current law, so official guidance matters.
Limitations / Disclaimer
This calculator provides a simplified inheritance-tax estimate only and is not legal, estate, or tax advice. Estate planning can depend on asset type, relationship, timing of gifts, domicile, and current law.
Last updated: May 12, 2026