Illinois Salary After Tax in 2026: Take-Home Pay Guide

Illinois is one of the simplest income-tax states to model. Instead of progressive brackets, it applies one flat rate to wages. The Illinois Department of Revenue's 2026 IL-700-T withholding guide sets that rate at 4.95 percent and gives each employee a basic exemption allowance of $2,925 for a standard single-allowance case. Withholding is therefore 4.95 percent of wages above $2,925.

Because the rate is flat, the effective Illinois rate rises only slightly with income. On $50,000 it is about 4.66 percent of gross pay; on $150,000 it is about 4.85 percent. The exemption matters more at lower salaries because it is a fixed dollar amount. Above that, every extra dollar of wages carries the same 4.95 percent Illinois charge.

All figures use WorthSpan's 2026 U.S. standard case: a single filer with W-2 wages, the federal standard deduction of $16,100, no itemized deductions, no credits, and no pre-tax retirement or health deductions. Local and city taxes are excluded. Figures are rounded to the nearest dollar.

The table combines the Illinois withholding with the same federal income tax, Social Security and Medicare that apply in every state. The federal part is identical to the figures in WorthSpan's no-state-income-tax guide, which lets you see exactly how much the Illinois layer costs at each salary.

• $50,000 salary: Illinois tax $2,330 — take-home $40,025 a year, about $3,335 a month.
• $75,000 salary: Illinois tax $3,568 — take-home $58,025 a year, about $4,835 a month.
• $100,000 salary: Illinois tax $4,805 — take-home $74,375 a year, about $6,198 a month.
• $150,000 salary: Illinois tax $7,280 — take-home $106,511 a year, about $8,876 a month.

Start with the state layer. Subtract the $2,925 exemption from $75,000 to get $72,075 of wages subject to Illinois withholding. Multiply by 4.95 percent and the Illinois figure is about $3,568 for the year.

The federal layer is calculated separately and does not deduct Illinois tax first. The 2026 standard deduction of $16,100 leaves $58,900 of federal taxable income, which produces about $7,670 of federal income tax through the 10, 12 and 22 percent brackets. Social Security adds $4,650 and Medicare $1,088.

Subtract all four deductions from gross pay and the take-home result is about $58,025 a year. Divided evenly that is roughly $4,835 a month, or about $2,232 on each of 26 biweekly paychecks before any retirement, insurance or other workplace deductions.

Against a no-income-tax state such as Texas or Florida, the Illinois difference equals the Illinois tax itself, because the federal deductions are the same. On a $100,000 salary that is about $4,805 a year, or roughly $400 a month. On $50,000 it is about $2,330 a year.

Against Pennsylvania, which uses an even lower flat rate, Illinois leaves less in your pocket: about $74,375 on $100,000 compared with $76,110 in Pennsylvania. Against New York, the two states are close at $100,000, at about $74,375 in Illinois and $74,320 in New York before New York City or Yonkers local tax. California leaves less at that salary in WorthSpan's model, about $72,151, once State Disability Insurance is included.

These comparisons cover tax only. Housing and living costs in Chicago, its suburbs and downstate Illinois vary widely, and a tax difference of a few hundred dollars a month can be outweighed by rent differences in either direction.

WorthSpan models Illinois state income-tax withholding using the published flat rate and the standard exemption allowance. It does not include additional allowances you might claim on Form IL-W-4 for dependants or other circumstances, which would reduce withholding. It also does not include any voluntary payroll deductions.

Withholding is an estimate of your tax, not the final liability. Your Illinois return can produce a refund or a balance due depending on credits, other income and how many allowances you claimed. For comparing job offers, withholding-based take-home pay is usually the right measure because it reflects the cash you receive each pay period.

Unlike New York or Pennsylvania, Illinois does not layer a local wage income tax on top of the state rate. Workers in Chicago and other Illinois municipalities pay the same 4.95 percent state rate as everyone else in the state, so the figures above apply across Illinois rather than only outside its largest city. Other local costs, such as property and sales taxes, do vary by location, but they do not appear on a payslip.

People who live in one state and work in another should check how their employer withholds. Illinois has reciprocal arrangements with some neighbouring states that allow residents of those states to have tax withheld only for their home state. If you commute across a state line, the state on your withholding certificate determines which state tax appears on your paycheck, and your take-home figure should be calculated with that state selected.

Bonuses are taxed in Illinois at the same flat rate as regular wages, which keeps the state part of a bonus simple to estimate: 4.95 percent of the bonus amount. Federal withholding on bonuses can follow different rules from regular pay, so the cash you receive from a bonus payment can look different from the annual calculation even when the final tax is the same.

If you are negotiating pay in Illinois, the flat rate makes the effect of a raise easy to estimate. At a $75,000 salary each extra $1,000 of gross pay faces the 22 percent federal bracket, 7.65 percent of Social Security and Medicare, and 4.95 percent of Illinois tax, so you keep a little over $650 of it. The pay-raise calculator shows the same arithmetic for your own numbers.

If you are deciding between Illinois and another state, put both offers through the salary-after-tax calculator with the correct states selected and compare the monthly take-home figures. Then add realistic housing and commuting costs before you decide. A raise that looks large in gross terms can shrink once state tax and living costs are both counted, and a smaller offer in the right place can leave you better off.

Finally, check the assumptions. A married filer, someone with large pre-tax retirement contributions or someone claiming additional Illinois allowances will see different numbers. The calculator lists the standard assumptions so you can judge how closely the estimate fits your situation.