Answers

What is the Illinois estate tax exemption?

By Adam Lysinski, Attorney · Updated May 16, 2026

Illinois taxes estates above $4 million — a threshold far lower than the federal exemption, and one that catches many Illinois families with real estate.

Call (773) 777-9888 — 5-min triage

Short answer

Illinois imposes its own estate tax on estates exceeding $4,000,000. This Illinois exemption is separate from, and much lower than, the federal estate-tax exemption — $15,000,000 for 2026 under the One Big Beautiful Bill Act. Because the Illinois threshold is comparatively low and is not indexed for inflation, families with a home, retirement accounts, and life insurance can exceed it without considering themselves wealthy.

Two separate estate taxes

The Illinois estate tax. Illinois taxes the estate of a deceased Illinois resident (and Illinois real estate of non-residents) when the estate exceeds $4,000,000. The Illinois Attorney General administers the Illinois estate tax.

The federal estate tax. The federal basic exclusion amount for 2026 is $15,000,000 under the One Big Beautiful Bill Act. An estate can owe Illinois estate tax while owing no federal estate tax at all, because the Illinois threshold is so much lower.

Why the $4M threshold catches ordinary estates

The Illinois $4M figure is not indexed for inflation, and the estate-tax calculation counts everything: the house, retirement accounts, life insurance proceeds, business interests, and other property. A Chicago-area family with appreciated real estate, substantial retirement savings, and a life insurance policy can cross $4M without thinking of themselves as wealthy — and the Illinois estate tax has a cliff-like structure that can make the first dollars over the threshold expensive.

What planning above the threshold looks like

Estates approaching or above the $4M Illinois threshold use advanced structures: irrevocable trusts, credit-shelter planning for married couples, lifetime gifting, irrevocable life insurance trusts to remove policy proceeds from the taxable estate, and valuation planning for business interests. A revocable living trust by itself does not reduce estate tax — the grantor still owns the assets. Comprehensive estate-tax planning above the $4M Illinois threshold is scoped at intake.

Related questions

What is the Illinois estate tax exemption?
Illinois imposes its own estate tax on estates that exceed $4,000,000. This exemption is separate from the federal estate-tax exemption and is administered by the Illinois Attorney General.
How is the Illinois exemption different from the federal one?
The Illinois exemption is $4,000,000. The federal basic exclusion amount for 2026 is $15,000,000 under the One Big Beautiful Bill Act. Because the Illinois threshold is much lower, an estate can owe Illinois estate tax while owing no federal estate tax.
Why do ordinary Illinois families exceed the $4M threshold?
The $4M figure is not indexed for inflation, and the estate-tax calculation counts everything — house, retirement accounts, life insurance proceeds, and business interests. A family with appreciated real estate, retirement savings, and a life insurance policy can cross $4M without considering themselves wealthy.
Does a revocable living trust reduce Illinois estate tax?
No. A revocable living trust does not reduce estate tax because the grantor retains full ownership of the assets during life. Reducing estate-tax exposure above the $4M Illinois threshold requires advanced structures such as irrevocable trusts, gifting strategies, and irrevocable life insurance trusts.

Continue reading

Need to talk to Adam?

The 5-minute triage call is free. Adam answers honestly: yes I can help and here’s what comes next, or no this is not my lane and here’s who handles it.

Call (773) 777-9888

Start here

Where can Adam help today?

I’m selling a home → I’m buying a home → I need a will or trust → I’m a real estate broker →