Illinois Paycheck Calculator 2026

How Illinois Taxes Affect Your Paycheck

Illinois uses a flat income tax structure instead of a progressive bracket system. For 2026, the state individual income tax rate is 4.95%, so each additional dollar of taxable wages is generally taxed at the same state rate.

This flat-tax model makes paycheck withholding more predictable than bracketed systems. Many workers find it easier to estimate net pay because state tax does not jump between multiple marginal rates.

Illinois generally does not have broad local income taxes on wages, though some municipalities may impose limited local taxes or fees. Most workers primarily see federal taxes, FICA, and the state flat tax on pay stubs.

Illinois Income Tax Brackets (2026)

Other Illinois Payroll Taxes

Illinois does not have a statewide employee SDI payroll tax. State unemployment taxes are generally employer-paid. Some municipalities may have limited local payroll-related taxes depending on where you live or work.

Federal Taxes That Apply in Illinois

In addition to Illinois state taxes, your Illinois paycheck is subject to federal taxes:

• Federal Income Tax: 10% to 37% based on your income and filing status
• Social Security Tax: 6.2% on income up to $176,100 (2026)
• Medicare Tax: 1.45% on all income, plus 0.9% additional Medicare tax on income over $200,000