What This Calculator Screens For in IllinoisA triage screen, not a tax return
For Illinois estates, the first triage question is whether the taxable estate exceeds the state's $4,000,000 exemption. An estate above that amount can owe Illinois estate tax even when it is below the federal threshold, so this tool screens for both the state and the federal exposure.
Probate questions and estate-tax questions are not the same thing. A family can have a probate problem with no tax issue, or a tax-sensitive estate that still transfers efficiently through trust planning.
What the screen looks atState estate-tax status, the federal threshold, and return context
Illinois State Estate Tax Applies
Illinois imposes its own state estate tax with a $4,000,000 exemption, separate from the federal estate tax. This tool screens both the state and the federal exposure.
Federal Threshold
The current screen uses a federal estate-tax exclusion amount of $15 million per person for 2026.
Return Context
Even when no tax is likely due, larger estates may still need more careful return and planning review than a rough calculator can provide.
Frequently Asked Questions
Does Illinois have a state estate tax?
What federal threshold does this Illinois calculator use?
Does every large estate owe federal estate tax?
Is this the same as preparing Form 706?
Official Sources and Further ReadingOfficial references used for this page
- Illinois Estate and Generation-Skipping Transfer Tax Act, 35 ILCS 405/ (secs. 2, 3, 6; $4,000,000 exclusion for deaths on or after January 1, 2013)
- Illinois Attorney General, Estate Taxes (returns filed with the Attorney General; payments to the State Treasurer)
- Illinois Department of Revenue, Income Tax Rates (individuals 4.95 percent; trusts and estates 4.95 percent; replacement tax on trusts 1.5 percent)
- 705 ILCS 105/27.1b (flat circuit clerk filing fees; no value-based probate tax)
- IRS Estate Tax
- IRS estate and gift tax overview
- IRS About Form 706
- IRS Publication 559 for survivors, executors, and administrators
Information current as of May 31, 2026
Settled Estate is not a law firm, and this content is for informational purposes only and does not constitute legal advice. Probate laws and procedures in Illinois can change. Consult with a qualified attorney for advice specific to your situation. Full disclaimer.