Illinois Estate Tax Calculator
Estimate your Illinois estate tax liability with the $4 million exemption
Illinois Calculator
Protect your legacy
Updated for 2025 with real Illinois rates, brackets, and regulations
Illinois is one of only 12 states (plus DC) that impose a state-level estate tax — and its $4 million exemption is dramatically lower than the federal $13.61 million exemption for 2024. This means many Illinois families with moderate wealth — a home worth $500,000 plus retirement savings and life insurance — can face Illinois estate tax even when the federal estate tax doesn't apply. Illinois estate tax rates are graduated from 0.8% to 16% on values exceeding the $4 million threshold. Married couples can effectively double the exemption to $8 million using proper estate planning (portability does NOT apply in Illinois — you must plan ahead with credit shelter trusts or QTIP trusts). There is no Illinois inheritance tax — only the estate pays.
Calculate Your IL Tax
Illinois Estate Tax
$184,280
IL Exemption
$4,000,000
Federal Estate Tax
$0
Total Tax
$184,280
Net to Heirs
$5,815,720
Effective Rate
3.1%
Above IL Exemption?
Yes — tax applies
Breakdown
Insight
Your estate of $6,000,000 exceeds Illinois's $4M exemption. IL estate tax (rates 0.8%–16%) is $184,280. Unlike the federal exemption ($13.61M), Illinois's $4M exemption is NOT indexed for inflation — making it one of the most aggressive state estate taxes in the US. Consider lifetime gifting (IL has no gift tax) or irrevocable trusts to reduce exposure.
AI Explanation
What This Means
Based on default inputs, the Illinois Estate Tax Calculator shows a illinois estate tax of $184,280. Key figures: IL Exemption: $4,000,000, Federal Estate Tax: $0, Total Tax: $184,280, Net to Heirs: $5,815,720, Effective Rate: 3.1%, Above IL Exemption?: Yes — tax applies.
Key Insights
Your estate of $6,000,000 exceeds Illinois's $4M exemption. IL estate tax (rates 0.8%–16%) is $184,280. Unlike the federal exemption ($13.61M), Illinois's $4M exemption is NOT indexed for inflation — making it one of the most aggressive state estate taxes in the US. Consider lifetime gifting (IL has no gift tax) or irrevocable trusts to reduce exposure.
What You Can Do
Enter your actual figures in the calculator above for a personalized breakdown. Consider consulting a tax professional for comprehensive planning, especially for complex situations involving multiple income sources or deductions.
Keep In Mind
This calculator provides estimates based on 2026 rates. Actual tax liability may vary based on credits, exemptions, and other factors not captured here. This is for educational purposes only and should not be considered tax advice.
How the Illinois Estate Tax Calculator Works
The Illinois Estate Tax Calculator uses 2026 tax rates, brackets, and deductions specific to Illinois to provide you with an accurate estimate of your tax obligations. Unlike generic federal-only calculators, this tool accounts for the unique tax structure that Illinois residents face.
Formula
IL Estate Tax = Graduated rates from 0.8%-16% on estate value above $4M exemption. Portability not available — married couples must plan ahead.Simply enter your financial details above, and the calculator instantly computes your results using the latest available data. All calculations happen directly in your browser — your personal information is never sent to any server or stored anywhere.
Why Use a Illinois-Specific Calculator?
State-Specific Rates
Uses real 2026 Illinois tax brackets, rates, and thresholds — not generic national averages that miss state-level nuances.
Local Programs & Exemptions
Factors in Illinois-specific programs, exemptions, and deductions that national calculators simply don't account for.
Instant & Private
All calculations run locally in your browser. No account required, no data stored, no waiting for results.
AI-Powered Explanations
Get a plain-English breakdown of your results with actionable insights you can actually use for financial planning.
What's Included
$4M IL Exemption
Calculates tax on the gap between Illinois's $4M and federal $13.61M exemptions
Portability Warning
Highlights that Illinois does NOT allow portability — married couples must use credit shelter trusts
IL vs Federal Comparison
Shows your combined Illinois + federal estate tax to reveal total estate tax burden
Frequently Asked Questions
What is the Illinois estate tax exemption?
Illinois exempts the first $4 million of an estate from state estate tax. Any value above $4 million is taxed at graduated rates from 0.8% to 16%. This is significantly lower than the federal exemption of $13.61 million (2024).
What are Illinois estate tax rates?
Illinois estate tax rates are graduated: 0.8% on amounts just above $4M, rising to 16% on amounts above $10.04M. The rates increase in tiers across 16 tax brackets, making the Illinois estate tax meaningfully progressive for large estates.
Does Illinois have an inheritance tax?
No. Illinois has an estate tax (paid by the estate before distribution) but no inheritance tax (paid by recipients). Heirs who receive money from an Illinois estate pay no additional Illinois tax on the inheritance itself.
Can married couples double the Illinois estate tax exemption?
Yes, but only with proper planning. Unlike federal law, Illinois does NOT allow portability of the unused exemption between spouses. Married couples must establish credit shelter trusts, QTIP trusts, or similar planning instruments during their lifetime to effectively utilize both $4M exemptions ($8M total).
How does Illinois compare to other states for estate tax?
Illinois's $4M exemption is below the national average among states with estate taxes. Washington state tops out at 20% on large estates. Oregon's exemption is only $1M. Maryland has both an estate and inheritance tax. By contrast, California, Texas, and Florida have no state estate tax at all.
Important Information for Illinois Residents
Tax laws in Illinois can change annually. This calculator is updated regularly to reflect the latest 2026 rates and regulations, but you should always verify important financial decisions with a qualified Illinois tax professional or CPA.
This tool is designed for informational and educational purposes. While we strive for accuracy using official Illinois Department of Taxation data, the results should be used as estimates for planning purposes only. Your actual tax liability may differ based on credits, special circumstances, and legislative changes that occur after our last update.
For filing deadlines, payment schedules, and official forms, visit the Illinois Department of Taxation and Finance website. If you have complex tax situations involving multiple states, business income, or significant investment gains, professional guidance is recommended.
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