Illinois Tax Calculators.
Tax year 2026 income tax rates, brackets, and sales tax for Illinois. Returns for tax year 2026 are generally filed in 2027; source links and last-verified dates are shown below.Tax year 2026 means income earned during calendar year 2026; those returns are generally filed in 2027. State and local sales tax rates can change during the year, so confirm current rules before filing or remitting tax.
Income Tax
Illinois has a flat income tax rate of 4.95% on all taxable income. The Illinois Constitution requires a flat rate. Illinois does not offer a standard deduction but provides a personal exemption of $2,625.
Sales Tax
Groceries are taxed at a reduced rate of 1%. Prescription drugs are exempt.
Illinois's 4.95% flat rate is near the national average, but its combined sales tax rate of 8.82% is among the highest in the nation.
What is Illinois's income tax rate?
Illinois has a flat income tax rate of 4.95% on all taxable income. The state constitution mandates a flat rate structure.
Does Illinois tax groceries?
Illinois taxes groceries at a reduced rate of 1%, compared to the full 6.25% state rate on other goods.
Does Illinois have a standard deduction?
No, Illinois does not offer a standard deduction. Instead, it provides a personal exemption of $2,625 per person.
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