Taxes in Decatur

Decatur's tax picture combines Illinois's real, statewide flat income tax with a genuinely elevated local property tax that runs even higher than Macon County's own already-above-average rate.

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Illinois's flat income tax, with a real retirement exemption

Illinois levies a simple, flat 4.95% tax on wages statewide, but taxes NONE of a retiree's Social Security, pension, or 401(k)/IRA income -- see illinois.js for the full mechanic.

A real, above-county-average property tax

Macon County's own average effective rate ran 2.10%, but Decatur itself ran as high as 2.64% citywide, with specific ZIPs reaching 3.23% -- a real, disclosed tension against the city's genuinely low home values.

A genuinely high combined sales tax

Decatur's 9.25% combined sales tax runs genuinely high for a city of its size.

Key takeaways

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Last reviewed: 2026-08-25. Independent research; not financial, tax, or legal advice -- confirm current figures with a local professional before making a decision.