Illinois Paycheck Take-Home (2026)

The federal slice (identical in every state)

On $85,000 salary, single, $3,000 pre-tax deductions, 2026 standard deduction $16,100:

• Federal income tax (annualized brackets): $9,210
• Employee FICA: $6,502 (6.2% Social Security on wages up to $184,500 + 1.45% Medicare)
• Pre-tax deductions: $3,000 (already out of taxable wages for the federal estimate)

Illinois is a flat 5.0% state income tax. The paycheck tool’s flat % matches that idea; locals may still apply.

IL-W-4 at 4.95% flat

Illinois withholding on a W-2 is the same 4.95% idea as the annual return, via IL-W-4 and IDOR tables. The paycheck calculator’s flat state % of 4.95 is a closer match here than in a graduated state. It is still not the official IDOR booklet method, and it ignores credits.

There is no Illinois city income tax on wages comparable to NYC or Philadelphia. Chicago costs show up as property tax, sales tax, and some business license fees — not as a second line on every paycheck.

A W-2 plus 1099 side hustle: IL withholding on the salary does not cover Schedule C profit. Start federal and Illinois estimates on the hustle. Illinois also has a lower 1099-K reporting threshold ($1,000 and four transactions) — see the 1099 vs W-2 page.

Source note: Illinois flat individual income tax 4.95%. Agency: Illinois Department of Revenue.

Worked biweekly stub: $85,000 in Illinois

26 pay periods, single, $0 W-4 Step 3 credits, $0 extra withholding:

State column = salary × 4.95%, matching how calcPaycheck applies pc-state. Graduated states and cities will differ from payroll software.

Same salary, three states (why the matrix exists)

Federal + FICA on this $85,000 profile is the same everywhere ($15,712). The take-home gap is the state (and local) line. Texas and Florida add $0. Illinois adds about $4,208 in this planning model ($161.83 per biweekly check).

A raise into Additional Medicare ($200,000 single) or over the Social Security wage base changes FICA the same way in every state. Illinois brackets or flat rate then apply to the larger wage — they do not replace FICA.

Two more Illinois salaries (same W-4 assumptions)

The paycheck calculator annualizes federal brackets, then splits by 26. State is still the flat planning % (4.95%) × salary — honest about what the tool does when locals are extra.

*$3,000 pre-tax, single, no Step 3 credit. Locals not included.

W-4 Step 4(a) when you also freelance in Illinois

Extra withholding on the W-2 can cover federal income tax on a small 1099, but it never pays self-employment tax — that still needs 1040-ES. It also never pays Illinois Department of Revenue unless your payroll setup includes extra state withholding. Most Illinois side hustles are cleaner as a separate quarterly set-aside: see quarterly taxes in Illinois.

If your only income is this W-2, the $1,000 estimated-tax rule usually does not bite because withholding already paid the IRS. Switching from staff to 1099 mid-year is when Illinois residents miss Q3/Q4. Put the start date on a calendar; do not wait for a 1099 in January.

Frequently asked questions