Illinois Estate Tax Calculator: tax by estate size
2026 law · reviewed September 3, 2026
| Taxable estate | Illinois tax | Illinois, as % of estate | Federal tax, one exclusion | Combined |
|---|---|---|---|---|
| $4,000,000 | $0 | 0.0% | $0 | $0 |
| $4,500,000 | $142,857 | 3.2% | $0 | $142,857 |
| $5,000,000 | $285,714 | 5.7% | $0 | $285,714 |
| $6,000,000 | $456,071 | 7.6% | $0 | $456,071 |
| $7,000,000 | $565,603 | 8.1% | $0 | $565,603 |
| $8,000,000 | $680,634 | 8.5% | $0 | $680,634 |
| $10,000,000 | $926,923 | 9.3% | $0 | $926,923 |
| $12,000,000 | $1,195,517 | 10.0% | $0 | $1,195,517 |
| $15,000,000 | $1,609,310 | 10.7% | $0 | $1,609,310 |
| $20,000,000 | $2,298,965 | 11.5% | $1,080,414 | $3,379,379 |
Illinois and federal estate tax by taxable estate, 2026 law, one all-Illinois estate, no deductions, one federal exclusion.
Educational only, not investment, tax, or legal advice. Results are hypothetical estimates that vary with each use and over time and are not guaranteed accurate or complete. Using this tool creates no client relationship with Considerate Capital, and the site that linked here is not affiliated with it. By using it you agree to the tool terms (opens in a new window).