How Illinois capital gains tax works
Illinois does not have a separate capital gains rate. Gains are taxed as ordinary income, stacking on top of your other earnings.
Because of that stacking, a large gain can push part of your income into a higher bracket, so the rate on the gain depends on your total income for the year.
Illinois taxes capital gains as ordinary income at the flat 4.95% rate.
Short-term vs long-term gains
Federally, assets held longer than a year qualify for lower long-term rates. Most states, including Illinois, do not offer a separate long-term rate.
This calculator estimates the IL state tax by adding the gain to your other income and measuring the extra tax — your true marginal cost.
Lowering the bill
Holding assets longer, harvesting losses to offset gains, and spreading sales across tax years can all reduce what you owe.
Remember this shows Illinois state tax only; federal capital gains tax applies on top. Verify with the Illinois Department of Revenue (tax.illinois.gov).
Frequently asked questions
Does Illinois tax capital gains?
Yes — Illinois taxes capital gains as ordinary income, so the rate depends on your total income.
What is the capital gains tax rate in Illinois?
Gains are taxed at your Illinois income tax rate, up to 4.95%, since there is no separate capital gains rate.
Are long-term gains taxed lower in Illinois?
Illinois taxes capital gains as ordinary income at the flat 4.95% rate.
Does this include federal capital gains tax?
No. This estimates the IL state tax only. Federal capital gains tax is separate and applies on top.