Illinois Income Tax (2026)

Info: Flat 4.95% individual income tax.

InfoVerified May 31, 2026

Tax rules change at the state line — and in your state.Track them in the free LawLert iPhone app: it alerts you when you cross into a state where they differ, and when they change in your state. No account.Get the app

Official source: tax.illinois.gov →

General legal information, not legal advice — verify important decisions with a licensed attorney.

Income Tax in states bordering Illinois

The same rule in each neighboring state LawLert has verified, from that state’s own official source.

IndianaInfo
Flat 2.95% for 2026, reduced from 3.00% effective Jan 1, 2026; scheduled to fall to 2.90% in 2027. Counties also levy local income taxes.
Verified May 31, 2026 · Source: in.gov · Full Indiana rule →
IowaInfo
Flat 3.8% for 2026 (single rate on all taxable income).
Verified Aug 2, 2026 · Source: revenue.iowa.gov · Full Iowa rule →
KentuckyInfo
Kentucky's flat individual income tax rate is 3.5% for tax years beginning on or after January 1, 2026, down from 4%, under 2025 House Bill 1. No further cut has been enacted for 2027 — the 2026 General Assembly did not act, so the rate stays at 3.5% for the tax year beginning January 1, 2027.
Verified Jul 28, 2026 · Source: apps.legislature.ky.gov · Full Kentucky rule →
MissouriInfo
Graduated, topping out at 4.70% on Missouri taxable income over about $9,436 for 2026 (the 2025 threshold was about $9,191); rates run 2.00%–4.70% in 0.50% steps. Brackets are indexed for inflation each year.
Verified Jul 30, 2026 · Source: dor.mo.gov · Full Missouri rule →
WisconsinInfo
Graduated; top rate 7.65% (brackets 3.50% / 4.40% / 5.30% / 7.65%).
Verified May 31, 2026 · Source: revenue.wi.gov · Full Wisconsin rule →

Don't get caught off guardCross into a state where this law is different and the free iPhone app tells you what changed, even with the app closed. It also alerts you when a law you track changes where you live. No account.Get the free app

Track this law — get alerted when it changes

We watch the official sources behind Illinois taxes rules. If a tracked rule changes, you get one short email — never more than one a week. Free, unsubscribe anytime.