TakeHome Pay
CalculatorHourlyBonusOvertimeNo Tax on OTNo Tax on TipsOffersIncome %Total CompTax Refund

Illinois Bonus Paycheck Calculator

A bonus paid in Illinois is withheld at the flat 22% federal supplemental rate in 2026 (37% on amounts above $1 million), plus FICA of 7.65% and a flat 4.95% Illinois income tax. That is roughly 34.6% withheld up front: withholding, not your final tax bill.

How are bonuses taxed in Illinois?

In Illinois, bonus withholding is typically 22% federal (the supplemental rate) plus 4.95% Illinois income tax plus 7.65% FICA: about 34.6% up front. Withholding isn't your final tax: at filing time a bonus is ordinary income, so any over-withholding comes back as a refund. Against the 5 states Illinois borders, the same a $10,000 bonus is worth $6,540 here: Indiana keeps $200 more ($6,740), Kentucky keeps $145 more ($6,685), Iowa keeps $115 more ($6,655), Missouri keeps $25 more ($6,565) and Wisconsin leaves $35 less ($6,505). Indiana, Iowa, Kentucky and Missouri are the only borders worth crossing for the tax alone.

Calculate your exact bonus take-home pay

Your bonus take-home

$3,270

from $5,000 bonusFor a $5,000 bonus · Illinois · single

Take-home 65%Taxes 35%
Bonus amount$5,000
Federal tax−$1,100
State tax−$248
Social Security−$310
Medicare−$73
Net bonus$3,270

Estimate based on 2026 federal and Illinois tax rules updated Oct 2026 How we calculate

Your details

Taxation method

Most common: a flat 22% federal rate is withheld on the bonus.

More options Base salary

What a bonus is actually worth in Illinois

On top of a $75,000 salary in Illinois, here is what each extra dollar survives federal tax, Illinois income tax and FICA in 2026:

BonusGrossIllinois taxYou keepShare kept
$5,000 bonus$5,000$248$3,27065.4%
$10,000 bonus$10,000$495$6,54065.4%
$25,000 bonus$25,000$1,238$16,35065.4%

Illinois takes about 5.0% of that money on top of the 22% federal marginal rate and 7.65% FICA.

How Illinois ranks on bonuses

Across all 50 states and DC, Illinois ranks 31st for what a $10,000 bonus leaves in 2026. That is $25 less than the median state ($6,565), and $523 more than California, where the same a $10,000 bonus leaves $6,017.

The best outcome anywhere is $7,035 in Alaska and the other states with no wage income tax, $495 more than Illinois keeps.

Illinois bonuses against the states next door

Crossing a state line changes what the same bonus is worth without changing what you are paid. Here is a $10,000 bonus in Illinois against the states it borders:

StateState income taxYou keepvs Illinois
Illinois$495$6,540—
Indiana$295$6,740$200 more
Iowa$380$6,655$115 more
Kentucky$350$6,685$145 more
Missouri$470$6,565$25 more
Wisconsin$530$6,505$35 less

How Illinois bonus withholding works

Short answer: your employer withholds a flat 22% for federal income tax (the supplemental rate), plus 7.65% for Social Security and Medicare, plus Illinois's flat 4.95% income tax: about 34.6% of a Illinois bonus withheld up front. Bonuses aren't actually taxed at a higher rate, though: at tax time they're ordinary income, and any over-withholding comes back in your refund. Here's how each piece works.

  • Federal supplemental rate: Most employers withhold federal income tax from bonuses at a flat 22%, $2,200 on a $10,000 bonus, or 37% above $1 million a year, regardless of your regular bracket.
  • Illinois flat tax: Illinois taxes bonuses like all other wages at its flat 4.95% rate: there's no separate state bonus rate.
  • FICA taxes still apply: Social Security (6.2% up to the annual wage base) and Medicare (1.45%, plus 0.9% for high earners) come out of a bonus like any wage: $765 on $10,000.
  • Over-withholding is common: The flat 22% federal rate is often higher than your actual effective rate, and the difference comes back as a refund. In Illinois the whole $10,000 nets $6,540 once state tax and FICA are in.

Your actual bonus tax depends on your total annual income, not the bonus alone: these figures assume a $75,000 Illinois salary. Enter your own numbers above for an estimate that fits your situation.

Frequently Asked Questions

Typically about 34.6%: a flat 22% federal supplemental withholding, 4.95% Illinois income tax, and 7.65% FICA. Your actual tax owed depends on your full-year income and may be lower: the difference comes back as a refund when you file.

The IRS requires employers to withhold federal income tax from supplemental wages (including bonuses) at a flat 22% rate for amounts up to $1 million, rising to 37% above that. Your employer may alternatively add the bonus to your regular paycheck and withhold using the aggregate method. Worked through for Illinois: a $10,000 bonus keeps $6,540: 65.4% of it, after $495 of Illinois income tax.

It depends on your total annual income and tax bracket. If the 22% flat withholding rate is higher than your actual effective rate on the bonus, you'll get the difference back as a refund; if you're in a higher bracket, you may owe more. On a $75,000 salary in Illinois, a bonus is taxed at about 22% federally plus 5.0% to Illinois, so the 22% flat rate is close to the mark at that income.

Yes: as regular income. Illinois taxes all wage income, including bonuses, at its flat 4.95% rate; there is no separate state bonus rate.

Splitting a bonus across pay periods can reduce withholding if your employer uses the aggregate method, which annualizes your income, but it changes the timing, not the amount you ultimately owe. Where you live changes the amount: Illinois ranks 31 of 51 on what a $10,000 bonus leaves, against $6,565 in the median state and $6,017 in California.

Against the 5 states Illinois borders, the same a $10,000 bonus is worth $6,540 here: Indiana keeps $200 more ($6,740), Kentucky keeps $145 more ($6,685), Iowa keeps $115 more ($6,655), Missouri keeps $25 more ($6,565) and Wisconsin leaves $35 less ($6,505). Indiana, Iowa, Kentucky and Missouri are the only borders worth crossing for the tax alone.

It depends on your income level. High earners ($300,000+) often pay less in Illinois (4.95% flat) than in progressive states (6%-10%+ effective rates). However, middle-income earners ($75,000-$150,000) might pay more in Illinois than in progressive states with generous lower brackets. At $100,000, you pay $4,950 in Illinois, while the same earner in a progressive state might pay $4,000-$5,500 depending on brackets. The 'flat tax' label doesn't automatically mean lower taxes.

Illinois property taxes are among the highest in the nation, especially in Chicago and surrounding suburbs. A $400,000 home in Chicago might incur $8,000-$12,000+ annually in property taxes (roughly $667-$1,000 monthly), which can offset income tax savings compared to other states. These taxes come through mortgage escrow or direct property tax bills, not on your paycheck, which is why many people don't factor them in when comparing states.

Related Tools