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Illinois Estate Tax Calculator

2026 law · reviewed September 3, 2026

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Federal exclusion available

Portability is federal only and takes a timely election; the ported amount is whatever the first estate did not use. Illinois grants $4,000,000 per person and ports none of it, whichever you choose.

Refine: property outside Illinois, or the proposed law
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Illinois computes the tax as if everything were here, then keeps only the Illinois share. Which property counts as sited elsewhere is a legal question settled on the return.

Illinois line
Illinois estate tax
$456,071
Federal estate tax
$0
Combined
$456,0717.6% of the estate

Above the Illinois line, under the federal one: Illinois is the only estate tax in the room at this size.