$100K a Year in Illinois: What You Take Home After Taxes

Illinois starts from $100,000 of income and subtracts its own standard deduction of $2,850, leaving $97,150 of state taxable income. Every dollar of that is taxed at the flat 4.95% rate. The state tax comes to $4,809 — an effective state rate of 4.8% against a marginal rate of 5.0% on the next dollar.

Illinois has no standard deduction and no itemized deductions; the only universal subtraction is a personal exemption a little under $3,000 per taxpayer and dependent, plus $1,000 for filers 65 or older or blind, and it disappears above $250,000 of adjusted gross income single or $500,000 joint. Credits carry the weight: a state earned income credit worth 20% of the federal credit, a child credit for EITC recipients with children under 12, a 5% credit for property taxes on a principal residence, and a K-12 education expense credit of up to $750.

Illinois has no local income taxes. The Illinois Constitution bars home-rule units, including Chicago, from taxing income, earnings or occupations without General Assembly authorization, and none has been granted. Chicago instead leans on the nation's highest big-city sales tax, a 9% amusement tax, and utility and parking taxes. Suburban Cook County and the collar counties add nothing to paychecks.

Federal tax is the same in every state. After the $16,100 standard deduction, $100,000 becomes $83,900 of federal taxable income and owes $13,225 of income tax (13.2% effective). Social Security takes $6,200 and Medicare $1,450. Before any state tax, that leaves $79,125 — the figure a Illinois worker would keep by moving to Texas or Florida, $4,809 more than staying put.

The same $100,000 of household income on a joint return keeps $80,042 in Illinois — $5,726 more than a single filer. Illinois uses the same brackets for joint and single filers, so the state-level marriage bonus comes only from the larger joint deduction; the federal side supplies most of the gap.

At this salary Illinois ranks #41 of 50. The best state, Alaska, leaves $79,125; the worst, Oregon, leaves $70,932. Against its Midwest neighbours:

Illinois's cost-of-living index is 93 (7% below the national average), so $74,316 of take-home has the purchasing power of about $79,910 in an average-cost area. The 30% guideline caps rent at $2,500 a month on this salary. $100,000 is 54% above Illinois's median household income of $65,000, which itself nets $51,331 after tax. A $10,000 raise from here keeps $6,540 after federal and Illinois tax.

$100,000 is the psychological line and, in 2026, roughly the 82nd percentile of individual full-time earners — about $38,000 above the median worker and $16,000 above the median household. It is what software engineers a few years in, nurse practitioners in lower-cost states, senior accountants, civil engineers with a professional license, and mid-career federal employees at GS-13 earn. It works out to $48.08 an hour.

For a single filer, $100,000 leaves about $34,000 inside the 22% bracket and stops roughly $22,000 short of the 24% bracket, so most people here should fill pre-tax accounts first: a maxed 401(k) plus an HSA shelters nearly $29,000 and saves over $6,000 in federal tax. State choice is now worth five figures over a few years — the best and worst state differ by more than $6,000 a year at this income — and it is the salary at which relocation math starts beating raise math.

Retirees are Illinois' clearest winners: pensions, IRAs and Social Security are entirely untaxed. High W-2 earners do better than the 4.95% headline suggests next to Wisconsin (7.65% top) or Minnesota (9.85%), and there is no local tax in Chicago. Dual-income couples pay a flat rate with per-person exemptions, so marriage changes nothing. Remote workers owe 4.95% on all wages earned while living in Illinois; reciprocity with Iowa, Kentucky, Michigan and Wisconsin covers cross-border commuters. Homeowners lose: the property tax bill on a modest house often exceeds the state income tax.