Illinois Paycheck Calculator 2026

How Illinois Paycheck Math Works in 2026

Quick answer: Illinois applies a flat 4.95% rate, unchanged for 2026, to your wages minus $2,925 per exemption allowance. Federal income tax uses 2026 single brackets with a $16,100 standard deduction in this calculator, and FICA adds Social Security at 6.2% on wages up to $184,500 plus Medicare at 1.45% on all wages. There is no local income tax anywhere in Illinois, including Chicago.

Illinois is one of the simplest states for paycheck estimation because the state portion is a single multiplication. Start with your gross annual wages, subtract $2,925 for each exemption allowance you claim on Form IL-W-4, multiply the remainder by 0.0495, and you have your Illinois liability. A single filer earning $100,000 with one exemption owes 4.95% of $97,075, which is $4,805.21. Claim zero exemptions and the same worker owes 4.95% of the full $100,000, or $4,950. Each additional allowance therefore saves exactly $144.79 per year at current rates.

Federal tax is computed separately and follows the progressive 2026 single schedule used in this calculator. Taxable federal income equals gross wages minus the $16,100 single standard deduction. The 2026 single floors are $0, $12,400, $50,400, $105,700, $201,775, $256,225, and $640,600, taxed at 10%, 12%, 22%, 24%, 32%, 35%, and 37% respectively. FICA is also separate: Social Security takes 6.2% of wages up to the $184,500 wage base for 2026, and Medicare takes 1.45% of every dollar with no cap. Your employer withholds all three layers — federal, Illinois, and FICA — from each paycheck, then divides the annual figures by your number of pay periods.

$100,000 Salary Walk-Through (Single, 1 Exemption)

The most requested example is a $100,000 salary for a single filer claiming one Illinois exemption, paid bi-weekly. Federal taxable income is $100,000 minus the $16,100 standard deduction, or $83,900. Applying the 2026 single brackets gives $1,240 on the first $12,400 at 10%, $4,560 on the next $38,000 at 12%, and $7,370 on the remaining $33,500 at 22%, for a total federal tax of $13,170. Illinois tax is 4.95% of ($100,000 minus $2,925), which equals $4,805.21. FICA is $6,200 for Social Security plus $1,450 for Medicare, totaling $7,650. Combined deductions are $25,625.21, leaving take-home pay of $74,374.79 per year, or about $2,860.57 per bi-weekly paycheck across 26 periods.

If you earn the same $100,000 but claim zero exemptions, Illinois tax rises to $4,950 and take-home falls to $74,230. With two exemptions, Illinois tax drops to $4,660.43 and take-home rises to $74,519.58. Federal and FICA figures do not change with Illinois allowances, which is a common point of confusion for new hires filling out both the federal W-4 and the state IL-W-4 on their first day.

Illinois Exemptions and Form IL-W-4 Allowances

The Illinois personal exemption allowance is $2,925 per person for the 2026 tax year, up from $2,850 in 2025. You claim allowances on Form IL-W-4, the Illinois Employee's and Other Payee's Withholding Allowance Certificate, which your employer uses to set state withholding. Most single workers claim one allowance for themselves; married workers and those supporting dependents claim more. Each allowance shields $2,925 of wages from the 4.95% rate, worth $144.79 of annual tax savings.

Exemptions phase out at higher incomes: allowances begin phasing out above $250,000 of base income for single filers and $500,000 for joint filers. Taxpayers who are 65 or older receive an additional $1,000 exemption each, and blind filers receive another additional $1,000 exemption each, which can be stacked with the basic allowance. If your income exceeds the phaseout thresholds, this calculator's Illinois figure will slightly understate your liability, so treat the result as an estimate and confirm with the Illinois Schedule IL-E/E worksheet or a tax professional.

Do not confuse IL-W-4 allowances with the federal W-4, which no longer uses allowances in the same way. Federal withholding now relies on dollar amounts and checkboxes, while Illinois still uses the classic allowance count. Updating one form does not update the other, so review both after marriage, divorce, the birth of a child, or a major raise. For the general federal mechanics behind withholding, see our paycheck calculator hub and the tax refund calculator for year-end reconciliation.

No Local Income Tax — Including Chicago

Illinois levies no local income tax anywhere, including Chicago, Aurora, Naperville, Springfield, and every other city or county. Your pay stub shows Illinois state withholding at 4.95% and nothing extra for your municipality. This surprises many newcomers from states like Pennsylvania, where cities such as Philadelphia impose their own wage taxes on top of the state rate. In Illinois, cities fund services through property taxes, sales taxes, and fees instead of payroll withholding, so a Chicago office worker and a downstate worker with the same wages and allowances owe identical Illinois income tax.

That simplicity is one reason Illinois payroll calculations are so predictable. Whether you work in the Loop, Schaumburg, Peoria, or Carbondale, the state formula is the same. Commuters who cross state lines are the only common exception, and those cases are governed by reciprocity agreements rather than city taxes, as explained below. Chicago workers should still budget carefully, because while there is no Chicago wage tax, the city has some of the highest combined sales taxes and parking costs in the nation alongside steep Cook County property taxes.

Property Taxes: The Other Half of the Illinois Picture

Illinois offsets its flat income tax with some of the highest property taxes in America. The statewide effective property tax rate averages about 1.88%, the second-highest in the country, with a median annual bill near $5,055 on owner-occupied homes. Cook County and the Chicago collar counties routinely run above the state average, while some downstate counties run below it. Renters feel this indirectly because landlords pass property taxes through in monthly rent.

Why does this matter on a paycheck page? Because take-home pay stretches differently across Illinois ZIP codes. A $74,375 take-home salary leaves far more breathing room in Springfield or Rockford than in Lincoln Park or Evanston, where housing costs absorb the difference. When comparing an Illinois offer to one in Texas or Florida — states with no income tax — remember to compare property tax and housing costs too, not just the withholding lines. Use our state tax rates hub to put Illinois alongside neighbors before making a move.

Retirement Income Is Exempt in Illinois

Illinois is unusually generous to retirees: virtually all retirement income is exempt from the 4.95% tax under Publication 120. That includes Social Security benefits, pension and annuity income, 401(k) and IRA distributions, and distributions from other qualified retirement plans. Active wages, self-employment income, and unemployment compensation remain taxable, but a retiree living on a pension plus Social Security often owes zero Illinois income tax.

Mechanically, you claim the subtraction on IL-1040 Line 5, labeled for federally taxed retirement and Social Security. Employers and payers exclude qualifying distributions from Illinois withholding where applicable, and retirees report the subtraction when filing. This exemption is a major planning lever: a worker considering Roth versus traditional contributions, or deciding when to start pension payments, should model the lifetime Illinois benefit of shielding distributions from the flat rate entirely. Federal tax still applies to most retirement income, so always run both layers.

Reciprocity With Iowa, Kentucky, Michigan, and Wisconsin

Illinois holds reciprocal agreements with Iowa, Kentucky, Michigan, and Wisconsin, meaning wages are taxed only by your state of residence when you commute across those borders. An Illinois resident working in Madison pays Illinois tax, not Wisconsin tax, on those wages. Critically, Illinois has no reciprocity with Indiana despite the busy Chicago-to-Northwest-Indiana corridor, so commuters there can face withholding in both states and must claim a credit to avoid double taxation.

Wisconsin commuters get the most questions. If you live in Illinois but work in Wisconsin, file Form IL-W-5-NR (Employee's Statement of Nonresidence in Wisconsin) with your Wisconsin employer to stop Wisconsin withholding; you then report the wages on your Illinois return at 4.95%. If you live in Wisconsin but work in Illinois, you do the mirror image: give your Illinois employer Wisconsin Form W-221 so Illinois withholding stops and Wisconsin taxes the wages. Iowa, Kentucky, and Michigan commuters use the equivalent nonresident statements for their states. Keep a copy of every exemption certificate, because payroll departments occasionally restart the wrong state's withholding after system changes.

Chicago, Hourly, and Salary Examples

Chicago workers use the same calculator as everyone else in Illinois — there is no city add-on to enter. A $25-per-hour full-time worker earning $52,000 per year with one exemption owes about $2,429.21 in Illinois tax, $5,137 in federal tax, and $3,978 in FICA, leaving roughly $40,456 in take-home pay, or about $1,556 bi-weekly. A $75,000 salaried worker with one exemption owes about $3,567.71 in Illinois tax, $8,770 in federal tax, and $5,737.50 in FICA, leaving roughly $56,924.79 per year, or about $2,189.41 bi-weekly. A $150,000 earner with one exemption owes about $7,280.21 in Illinois tax, $23,476 in federal tax, and $11,475 in FICA, leaving roughly $107,768.79 per year.

Pay frequency changes only the per-check size, not the annual totals. The same $100,000 example above pays $2,860.57 bi-weekly over 26 checks, $3,098.95 semi-monthly over 24 checks, $6,197.90 monthly over 12 checks, or $1,430.28 weekly over 52 checks. Months with a third bi-weekly paycheck feel like a bonus but are simply part of the 26-period arithmetic. Hourly workers with variable schedules should enter their best estimate of annualized wages; overtime, bonuses, and commissions are all taxable as ordinary Illinois wages at 4.95% when paid.

Illinois vs. Neighboring States

Illinois charges a flat 4.95% on all taxable income, while Wisconsin and Minnesota use progressive brackets climbing to roughly 7.65% and 9.85% at the top. That makes Illinois relatively attractive for high earners compared with those two neighbors, though less attractive for low earners who would pay lower marginal rates under a graduated system. Iowa now levies a flat 3.8% rate, below Illinois, after its recent tax reform. Indiana, without reciprocity, charges a flat 3.15% plus county taxes that can push combined rates higher. Missouri and Kentucky sit in the mid-4% range with their own flat or graduated structures.

For state-to-state paycheck comparisons, try the same salary in our California paycheck calculator, Texas paycheck calculator, New York paycheck calculator, and Florida paycheck calculator to see how progressive brackets and zero-tax states shift take-home pay. Then return to the state tax rates hub for the national table. Illinois consistently lands in the middle of the pack for income withholding but near the top for property tax burden, so evaluate both before relocating.

Tips to Optimize Your Illinois Paycheck

First, verify your IL-W-4 allowance count each January and after every life event, since each $2,925 allowance moves your Illinois bill by $144.79. Second, fund pre-tax accounts such as a 401(k), HSA, or FSA through payroll, because those contributions reduce the wage base for both federal and Illinois tax as well as FICA. Third, if you commute across a reciprocal border, confirm the correct nonresident certificate is on file so you are not over-withheld in two states. Fourth, Chicago-area workers should weigh property and sales taxes alongside withholding when budgeting, because the 4.95% flat rate tells only part of the affordability story. Finally, reconcile every spring with our tax refund calculator so your withholding tracks your actual liability instead of generating a large refund or an unexpected balance due.