Severance pay in Illinois
In Illinois, your severance check will have federal tax and FICA withheld, plus Illinois state income tax at a flat 4.95%. Your unemployment claim can start immediately, but salary-continuation severance may delay benefit payments week by week. File within the first week after job loss to lock in your base period and avoid losing potential weeks.
Illinois at a glance
What severance means in Illinois
Illinois has a flat 4.95% state income tax. Your employer withholds 4.95% from your severance (after allowances), plus 22% federal supplemental withholding and 7.65% FICA. These are payroll withholding percentages, not your final tax bill. Your actual Illinois tax due depends on your total 2026 income, filing status, exemptions, deductions, and credits.
Severance is taxed as ordinary income on your federal and Illinois returns. The 22% and 4.95% withheld may be more or less than you ultimately owe. If your total annual income is lower in 2026, you may get a refund; if higher, you may owe more when you file. The structure of severance (lump sum vs salary continuation) affects unemployment timing, not the tax rate.
A worked example
- Annual salary: $78,000
- Years employed: 6
- Severance: 8 weeks pay ($12,000 gross)
- Paid as lump sum in one check
- Illinois withholding: 4.95% on taxable portion
- Federal supplemental withholding: 22%
- FICA: 7.65% (6.2% Social Security + 1.45% Medicare)
- Filing status: Single, one personal exemption
Illustrative payroll-withholding estimate on $12,000 lump-sum severance: about $7,848 net; not final tax advice.
Run your own numbers →Unemployment in Illinois
01In Illinois, you generally qualify for unemployment if you earned at least $1,600 in your base period (first 4 of the last 5 completed quarters) and at least $440 outside your highest-paid quarter, are unemployed through no fault of your own, and are able, available, and actively seeking work. Your Weekly Benefit Amount (WBA) is roughly 47% of your average weekly wage from the two highest-earning quarters, capped at $628/week for 2026 (higher with dependents).
02Benefits last up to 26 weeks, but your actual duration depends on your total base-period wages relative to your WBA. Illinois has no waiting week, so your claim can be effective the Sunday of the week you file. Severance paid as salary continuation may be allocated week by week and can delay or reduce benefits for those weeks; lump-sum severance typically does not block eligibility but must be reported. You must certify weekly and report all income; work-search activities are required. File at ides.illinois.gov.
Your first 72 hours
- 01Your claim starts the Sunday of the filing week; filing late can cost you a week of benefits
- 02Illinois law requires payment by the next regular payday; accrued vacation is earned wages that cannot be forfeited
- 03Review your severance agreement for payment structure (lump sum vs salary continuation)Salary continuation may delay unemployment benefits week by week; lump sum usually does not block eligibility
- 04Speeds up your UI Finding letter and reduces processing delays
- 05You have 60 days to elect COBRA after receiving notice; coverage can be retroactive if elected
- 06You need this letter to know your WBA and first certification date; certifications are weekly
The calculator estimates your Illinois unemployment Weekly Benefit Amount using the state formula (47% of average weekly wage from your two highest quarters), capped at $628/week for 2026, and shows up to 26 weeks of potential benefits. It also estimates severance take-home pay using 22% federal supplemental withholding, 7.65% FICA, and 4.95% Illinois state withholding. Results are educational estimates only, not official IDES determinations or tax advice.
Illinois severance FAQ
Will severance stop my unemployment benefits in Illinois?
Not automatically. Lump-sum severance usually does not block eligibility but must be reported. Salary continuation or installment severance may be allocated week by week and can delay or reduce benefits for weeks you receive payments.
Do I have to serve a waiting week before unemployment starts in Illinois?
No. Illinois has no unpaid waiting week. Your claim can be effective the Sunday of the week you file, and you can be paid for the first eligible week if you meet all requirements.
How is my Illinois unemployment weekly amount calculated?
IDES adds your two highest-earning quarters, divides by 26 to get an average weekly wage, then multiplies by 47%. The result is your WBA, with a 2026 maximum of $628/week for individuals (higher with dependents).
Must my employer pay out unused vacation or PTO when I'm laid off?
Yes. Under the Illinois Wage Payment and Collection Act, accrued unused vacation is treated as earned wages and must be paid in your final compensation by the next regular payday.
When exactly should I file for unemployment after my last day?
File within the first week after you become unemployed. Your claim starts the Sunday of the week you file; as long as you file by Saturday, you won't lose that week's potential benefits.
What happens if I get a job or work part-time while on unemployment?
You must report all gross wages when you certify each week. If your earnings exceed your WBA, your claim may suspend for that week; partial benefits may be available if earnings are below your WBA.
Sources & verification (7)
- Illinois Department of Employment Security – Unemployment Insurance Benefitsverified 2026-06
- IDES – UI Benefit Handbook: Benefit Determinationverified 2026-07
- IDES – UI Finding Letter Explainedverified 2026-03
- IDES – What Every Worker Should Know About Unemployment Insuranceverified 2026-06
- Illinois Department of Revenue – IL-700-T Withholding Tax Tables 2026verified 2026-02
- IRS – Publication 15-T (Federal Income Tax Withholding Methods)verified 2026-01
- Illinois Wage Payment and Collection Act (820 ILCS 115/5) – Final Compensationverified 2026-08
Figures are payroll-withholding and benefit-maximum estimates verified 2026-08, not final tax or an eligibility decision. Rules, rates and benefit amounts change — confirm your situation with Illinois's official agency. NextClara is not a law firm, tax preparer, employer, or government agency, and gives educational estimates only.