Illinois Salary Calculator 

Illinois uses a refreshingly simple method to calculate state income tax: instead of multiple tax brackets, a single, flat rate of 4.95% applies to all taxable income, regardless of how much you earn. This Illinois paycheck calculator — or salary calculator, depending on what you call it — combines that flat state rate with federal income tax, FICA contributions, and any pre-tax deductions (such as 401(k) contributions or health insurance) to show your exact take-home pay. Enter your annual salary below to see the actual amount that will be deposited into your account with each paycheck.

How the Illinois Paycheck Calculator Works

Every paycheck in Illinois is subject to three levels of withholding. First is federal income tax, based on your tax filing status and the 2026 federal tax brackets. Second are FICA contributions: Social Security at 6.2% (up to the $184,500 income limit for 2026) and Medicare at 1.45% (with no income cap). Third is Illinois state income tax, calculated using a flat rate of 4.95% on taxable income after deducting personal exemptions (currently set at $2,925 per exemption for 2026).

Since Illinois uses a flat rate rather than progressive brackets, there is no need to determine which income category you fall into; the same 4.95% rate applies whether you earn $40,000 or $400,000. This also applies to bonuses and other supplemental pay—an important point, as many people mistakenly believe bonuses are taxed at a higher rate. In Illinois, the state tax portion is the same as that applied to your regular salary.

If your employer offers a 401(k) plan or subsidized health insurance, these amounts are typically deducted from your pay before federal and state taxes are calculated, thereby reducing your taxable income at both levels. Furthermore, Illinois does not impose local or municipal income taxes, unlike other states where cities levy their own wage taxes.

Illinois Paycheck Example: $65,000 Annual Salary

Below are the figures for a $65,000 annual salary earned by a single taxpayer in Illinois, paid bi-weekly, using this Illinois paycheck calculator’s 2026 rates:

• Federal income tax: $6,010 annually
• Illinois state income tax: $3,070 annually
• Social Security: $4,030 annually
• Medicare: $943 annually
• Net pay: $50,947 annually, or $1,960 per paycheck (bi-weekly)

That works out to an effective tax rate of roughly 22%. The state tax portion is straightforward to verify by hand: since Illinois has no brackets, it’s simply 4.95% applied to taxable income after the personal exemption — one of the easiest state tax calculations to check yourself.

Illinois Paycheck Example: $110,000 Annual Salary

Because Illinois taxes every dollar at the same 4.95% rate, higher earners don’t see the jump in state tax burden that happens in progressive-tax states. Here’s the breakdown for a $110,000 salary, single filer, paid bi-weekly:

• Federal income tax: $17,600 annually
• Illinois state income tax: $5,290 annually
• Social Security: $6,820 annually
• Medicare: $1,595 annually
• Net pay: $78,695 annually, or $3,027 per paycheck (bi-weekly)

At this income level, the effective tax rate rises to around 28% — but notice the Illinois state tax portion is still almost exactly 4.95% of taxable income, the same percentage as the $65,000 example. That consistency is the core advantage of a flat tax system: your state tax rate never climbs just because your income does.

Is Illinois a High-Tax or Low-Tax State?

It depends on what you’re measuring. Illinois’s 4.95% flat income tax rate is actually lower than the top marginal rate in most states that tax income progressively — California tops out at 13.3%, for example. But Illinois makes up ground elsewhere: it has one of the highest average property tax burdens in the country, and a statewide sales tax of 6.25% that can climb past 10% in Chicago once local add-ons are included. Full details on current Illinois tax rules are available directly from the Illinois Department of Revenue.

For salaried income specifically, though, Illinois is genuinely competitive — the flat rate means moderate and high earners alike pay a predictable, comparatively modest state income tax, even if other parts of the tax system add up elsewhere.

Illinois vs. a No-Income-Tax State

Compared to Texas or Florida, Illinois residents do pay a real state income tax line that those states don’t have. At $65,000, that’s roughly $3,070 a year going to Illinois that wouldn’t be withheld in a no-income-tax state. At $110,000, the gap grows to about $5,290 annually.

That said, the gap is meaningfully smaller than what a California or New York resident faces at the same income levels, since Illinois’s flat 4.95% rate is well below the top marginal rates in those progressive-tax states. This Illinois paycheck calculator makes it easy to see exactly where that gap lands for your own salary.

If your employer offers a retirement savings plan, our 401(k) calculator shows how contributions lower your taxable income at both the state and federal level. And if you’re comparing offers across states, our national paycheck calculator lets you switch states directly to compare net pay.