Illinois 401(k) Calculator 2025
Project your 401(k) retirement savings in Illinois (IL). Illinois has a 5.0% flat state income tax. Enter your salary, contribution rate, and employer match to see how your 401(k) will grow and how much you save in taxes.
Note: No standard deduction; personal exemption $2,775
Your 401(k) Details
% of salary you contribute each paycheck
Employer Match
e.g., 50% means employer matches 50 cents per dollar
Employer matches up to this % of your salary
Enter your 401(k) details to see retirement projections
How 401(k) Contributions Affect Your Illinois Taxes
Illinois has a flat income tax rate of 5.0%. Traditional 401(k) contributions reduce both your federal and Illinois state taxable income, giving you a double tax benefit during your working years.
For example, if you contribute $10,000 to a traditional 401(k), you save approximately $495 in Illinois state taxes alone, on top of your federal tax savings.
Keep in mind that 401(k) withdrawals in retirement will be taxed as ordinary income at Illinois's 5.0% rate (assuming current law). If you expect to remain in Illinois during retirement, a Roth 401(k) may be worth considering to lock in tax-free withdrawals.
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