The Estate Tax Calculator is a free browser-based tool that estimates US federal estate tax by subtracting the basic exclusion amount from a gross estate and applying the flat 40% rate to whatever remains. Federal estate tax is widely misunderstood as a tax on the whole estate; it is a tax on the excess above a very large exclusion, which is why the effective rate this tool reports is always far below 40%. Enter the total fair market value of all assets and the calculator returns the exclusion used, the taxable estate, the tax due, and the effective rate measured against the full estate.
What people use it for
A business owner sizing a liquidity problem
A founder whose company represents most of an estate wants to know whether heirs would face a cash bill they cannot pay without selling the business itself. A gross estate above the exclusion produces a concrete number, and that number is usually what life insurance or a buy-sell agreement is sized against during succession planning.
Confirming an estate falls below the threshold
A retired couple with a paid-off home and retirement accounts suspects the whole topic simply does not apply to them but has never checked. Entering the combined value returns zero tax and shows how much headroom remains, which is a faster answer than booking a consultation and frequently ends the question permanently.
Watching the scheduled exclusion reduction
An adviser explaining that the elevated exclusion is scheduled to fall runs the same estate against a much lower figure to show the difference in cash terms. The comparison turns an abstract legislative date into a dollar amount, which is what actually motivates gifting or trust planning while the higher exclusion still applies.
Valuing a planned charitable bequest
Someone considering leaving a portion of an estate to charity wants a rough sense of the scale involved before speaking to a lawyer. Running the estate before and after a planned bequest shows how the taxable amount shrinks, though the deduction has to be applied by hand because the page has no field for it.
Worked examples
Input: Gross estate: $15,000,000
Result: Exclusion $13,610,000, taxable estate $1,390,000, estate tax $556,000, effective rate 3.71%. Only about 9% of the estate is exposed at all, which is exactly why the headline 40% rate and the real burden look so different.
Input: Gross estate: $12,000,000
Result: Exclusion $13,610,000, taxable estate $0, estate tax $0, effective rate 0.00%. The estate sits comfortably below the threshold with $1,610,000 of unused exclusion still available against future growth.
Input: Gross estate: $20,000,000
Result: Taxable estate $6,390,000, estate tax $2,556,000, effective rate 12.78%. Against the $15,000,000 run the estate grew by a third while the tax more than quadrupled, because every dollar above the exclusion is taxed at the full 40%.
Written by Ahsan Mahmood. Last updated . This calculator runs entirely in your browser and produces estimates, not tax advice.