$74,375 per year

For a single filer earning $100,000 in Illinois (tax year 2026), the take-home pay is approximately $74,375 per year after $13,170 federal income tax, $7,650 in FICA (Social Security and Medicare), and $4,805 in state and local taxes. This is an effective tax rate of 25.63%.

The numbers on this page assume no pre-tax deductions. If you contribute to 401(k), HSA, healthcare FSA, or dependent care FSA, your actual federal tax will be lower. Use the live calculator to model exact pre-tax deductions — it applies them to your federal taxable wages and, for verified states (currently Pennsylvania, Michigan, and California), to your state taxable wages too.

Common reasons: (1) pre-tax deductions your employer withholds — if you haven't entered them in the live calculator, your paycheck shows lower taxes; (2) W-4 withholding is an IRS safe-harbor estimate, not your true tax owed — you reconcile at filing; (3) state and local tax credits (EITC, property tax relief, child tax credit) that we don't model; (4) post-tax deductions like Roth 401(k) contributions or wage garnishments; (5) multiple jobs or side income changing your effective bracket.

The live calculator caps HSA input at the 2026 family limit ($8,750). If you have self-only HDHP coverage, your limit is $4,400 — enter no more than that. The age-55+ HSA catch-up contribution ($1,000) is not yet modeled. HSA contributions are pre-tax for FICA only when made through a §125 cafeteria plan (standard employer payroll deduction); standalone HSA contributions are post-FICA-tax.

The One, Big, Beautiful Bill Act (signed July 2025) raised the Dependent Care FSA limit from $5,000 to $7,500 starting tax year 2026. For married filing separately, the limit is $3,750 (raised from $2,500). The live calculator applies the correct limit based on your filing status. This is the first DCFSA limit increase since 1986.

Not yet. The live calculator exposes only the regular limits ($24,500 for 401(k), $8,750 for HSA family). Age-50+ adds $8,000 to 401(k) under §414(v); age-60-63 adds $11,250 under SECURE 2.0; age-55+ adds $1,000 to HSA under §223(b)(3). Catch-up support is on the roadmap; for now, treat the calculator's results as an upper bound on tax for older filers using catch-up.

A state or city is verified when its tax tables, rates, and brackets have been cross-checked against the official Department of Revenue publications for the given tax year. We list our primary-source citations on every page. Unverified jurisdictions are excluded from search indexing (with a noindex tag) and labeled "coming soon" — we don't show approximate data presented as authoritative. As of tax year 2026, six US jurisdictions are verified.

Your effective tax rate (25.63%) is your total tax divided by your gross income — the average percentage of your income that goes to taxes. Your marginal tax rate (34.60%) is the rate that applies to your next dollar of income. Marginal rates are always equal to or higher than effective rates in a progressive tax system.

We only apply pre-tax deductions (401(k), HSA, FSA) to state taxable wages for states whose conformity with federal tax code is verified against their Department of Revenue. Currently that's Pennsylvania and Michigan for tax year 2026. For Illinois, the live calculator applies these deductions to federal taxable wages and FICA wages, but not to state taxable wages — your actual Illinois state tax may be lower than shown when deductions are entered. We're expanding state coverage over time.

Illinois imposes a flat 4.95% income tax (35 ILCS 5/201, stable since July 2017). Instead of a conventional standard deduction, IL provides a per-exemption allowance under 35 ILCS 5/204 — $2,925 for tax year 2026 per IDOR Informational Bulletin FY 2026-15, indexed annually. The same per-exemption amount applies to the filer, spouse, and each qualifying dependent: a single filer with no dependents claims one exemption; a married-filing-jointly filer with 2 children claims four ($2,925 × 4 = $11,700). The calculator applies the per-filer exemption automatically (single, MFS, HoH = 1; MFJ = 2) and adds the per-dependent amount via the dependents input. High-income cliff phase-out: per §204, the entire exemption allowance — both per-filer and per-dependent — is disallowed when adjusted gross income strictly exceeds $500,000 for married-filing-jointly returns or $250,000 for all other returns. The phase-out is a cliff, not a gradual reduction: AGI of exactly $250,000 preserves the full exemption; AGI of $250,000.01 disallows it entirely. The K-12 Education Expense Credit and Illinois Property Tax Credit are also disallowed at the same thresholds but are separate from the W-2 take-home computation. Sources: 35 ILCS 5/204; IDOR FY 2026-15.

This calculator applies the standard deduction ($16,100 for Single). If you itemize using IRS Schedule A — typically when your mortgage interest, state and local taxes (capped at $10,000), charitable donations, and qualified medical expenses exceed the standard deduction — your federal taxable income will differ. We don't model itemization because it requires line-by-line input and is highly individualized. Use IRS Schedule A worksheets or consult a tax professional for itemized scenarios.

Federal income tax, FICA (Social Security + Medicare + Additional Medicare), and state income tax are computed from official 2026 IRS, SSA, and state Department of Revenue tables. This page assumes no pre-tax deductions, no itemized deductions, no tax credits, and W-2 wage income only. The live calculator supports 401(k)/HSA/FSA pre-tax deductions; itemized deductions, credits, self-employment income, and multi-state allocation aren't modeled.