Federal estate tax estimator Estimate 2026 US federal estate tax from gross estate value, deductible reductions,
adjusted taxable gifts, and any DSUE portability amount.
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Switch displayed amounts without changing the 2026 federal estate-tax assumptions.
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Estate tax calculator guide: taxable estate, DSUE, and the federal unified rate schedule
An estate tax calculator estimates whether a US estate may exceed the federal filing threshold and how much tentative federal estate tax could be due after deductions, lifetime taxable gifts, and any portable deceased spousal unused exclusion amount are considered. This version is a 2026 federal Form 706 baseline only, intended for first-pass planning rather than return preparation.
How federal estate tax is structured
Federal estate tax does not start from gross estate value alone. The first step is to reduce the gross estate by deductible transfers, expenses, and similar reductions to arrive at the taxable estate. Adjusted taxable gifts made during life are then brought back into the transfer-tax base so the unified gift-and-estate tax system can be applied.
This is why estate-tax planning usually focuses on the combined transfer base rather than only on the probate estate. The relevant question is not just what the estate owns at death, but how the taxable estate and prior taxable transfers interact with the federal exclusion amount and unified rate schedule.
Taxable estate = Gross estate - Deductions
The taxable estate reflects the estate remaining after deductible reductions are applied.
Taxable transfer base = Taxable estate + Adjusted taxable gifts
The federal unified transfer-tax calculation layers lifetime taxable gifts back into the taxable estate.
Why the exclusion amount and DSUE matter
For 2026, this calculator uses the federal exclusion framework currently in force after the One Big Beautiful Bill changes, including the higher baseline exclusion amount and any optional DSUE amount you enter. DSUE stands for deceased spousal unused exclusion, the portability amount that can sometimes carry a late spouse’s unused exclusion into the surviving spouse’s transfer-tax planning.
That portability feature can materially reduce estimated estate tax for widowed taxpayers, but it does not turn this calculator into a full estate-planning engine. Trust elections, QTIP treatment, valuation discounts, and other return-level decisions still require separate analysis.
Worked example: a 20,000,000 gross estate with 1,000,000 of deductions
Suppose the gross estate is 20,000,000, deductions total 1,000,000, there are no adjusted taxable gifts, and there is no DSUE amount. The taxable estate is 19,000,000. With the 2026 baseline exclusion applied, the amount above exclusion is 4,000,000.
At that level, the simplified federal estimate is 1,600,000 of estate tax. That does not mean every estate with the same gross value will owe the same amount, because lifetime gifts, portability, valuation issues, and state death taxes can all change the real filing position. It does show how quickly federal estate tax can appear once the estate is materially above the available exclusion.
What this estimate excludes
This calculator intentionally stays within a narrow federal planning scope. It does not include generation-skipping transfer tax, state estate or inheritance tax, special-use valuation, installment elections, nonresident estate rules, or detailed trust and marital-election planning.
Use it to understand the baseline federal structure, not to replace Form 706 preparation. If the estate is large enough for the estimate to matter, real filing and planning decisions should be reviewed against the current IRS instructions and professional estate-planning advice.
What is the difference between gross estate and taxable estate?
Gross estate is the starting value before deductions. Taxable estate is what remains after deductible expenses, transfers, and similar reductions are applied.
What is DSUE in an estate-tax calculation?
DSUE means deceased spousal unused exclusion. It is a portability amount that can sometimes carry a late spouse’s unused federal exclusion into the surviving spouse’s transfer-tax planning.
Does this include state estate or inheritance tax?
No. This version is a US federal Form 706 baseline only. State estate and inheritance taxes are outside the current scope.
Does this calculator prepare Form 706?
No. It is a planning estimate, not return-preparation software. If a real estate may be taxable, the filing and planning details should be checked against current IRS instructions and professional advice.
