Illinois Department of Employment Security calculates your weekly benefit amount at 47% of your average weekly wage during your two highest-earning quarters of the base period, up to a maximum of $628 per week with no waiting week. On top of this, Illinois pays dependency allowances of $15 per week per qualifying dependent (spouse or dependent child), with a maximum allowance of $92.50/week. A claimant at the maximum receiving six qualifying dependents would receive $628 + $92.50 = $834.50 per week — among the highest possible UI payments in the Midwest.
- Illinois pays 47% of your average weekly wage from your two highest base period quarters, capped at $628/week.
- Dependency allowances add $15/dependent/week (max $92.50/week extra) for qualifying children and non-working spouses.
- No waiting week — your first week of unemployment is payable if you file promptly.
Always verify exact numbers, deadlines, and forms on the Illinois Department of Employment Security's official website – this page provides general guidance, not state-specific legal advice.
How IDES Calculates Your Weekly Benefit Amount
Illinois uses a formula based on your two highest-earning quarters in the base period. IDES adds the wages from those two quarters, divides by 26 to get your average weekly wage, and then applies the 47% rate. The formula: (Q1 wages + Q2 wages) ÷ 26 × 0.47 = weekly benefit amount, subject to the $628 cap.
Example: Your two highest quarters were $18,000 and $16,500. Combined: $34,500. Average weekly wage: $34,500 ÷ 26 = $1,327. Apply the 47% rate: $1,327 × 0.47 = $624/week. Since this is below the $628 cap, you would receive $624/week. To hit the $628 maximum, your average weekly wage from the two-quarter calculation would need to exceed approximately $1,579 ($1,579 × 0.47 ≈ $628).
The minimum weekly benefit is $51. If your calculation produces a result below $51, IDES pays $51/week.
Dependency Allowances
Illinois adds $15 per week per qualifying dependent on top of your base weekly benefit amount. Qualifying dependents are: dependent children (typically under 18 or dependent due to disability) and a non-earning spouse who is not collecting their own unemployment benefits. The dependency allowance total is capped at $92.50 per week.
This allowance is claimed during the initial application and requires accurate information about your dependents. IDES may verify dependent status. Workers with children who meet the definition receive a meaningful supplement — a claimant with four children and a non-working spouse (5 dependents × $15 = $75/week) would receive $75 on top of the base amount. The maximum adds $92.50 regardless of how many dependents exceed the implied threshold.
Duration: Up to 26 Weeks
Illinois pays up to 26 weeks of standard unemployment insurance. The exact number of payable weeks depends on your base period wages, but most workers with continuous full-time employment receive the full 26 weeks. Illinois has no waiting week, so all 26 weeks are payable, starting from week one. The total maximum benefit amount for a claimant at $628/week for 26 weeks (no dependents) is $19,292.
Part-Time Work During Benefits
Illinois allows part-time work while collecting benefits. During biweekly IDES Online certification, report your gross earnings. Illinois deducts 50% of any earnings that exceed 50% of your weekly benefit amount. This formula allows you to earn up to 50% of your WBA with no reduction, and reduces the benefit by 50 cents for every dollar earned above that threshold. Working part-time in Illinois is financially worthwhile — your total income (partial benefit + earnings) always exceeds what you would receive from the benefit alone.
Frequently Asked Questions
- What is Illinois's exact formula for calculating unemployment weekly benefit amount?
- Illinois takes your wages from the two highest quarters in the base period, adds them, divides by 26 to get your average weekly wage, then multiplies by 47%. For example: two best quarters totaling $28,000. Average weekly wage: $28,000 ÷ 26 = $1,077. WBA: $1,077 × 0.47 = $506/week. The minimum is $51/week and the maximum is $628/week. This formula is more complex than some states (like New York, which just divides the highest quarter by 26) but often produces higher benefit amounts for workers with moderate to high incomes because of the 47% rate applied to two quarters.
- Who qualifies as a dependent for Illinois unemployment allowances?
- Illinois recognizes two categories of qualifying dependents for the $15/week allowance: (1) dependent children — including biological children, legally adopted children, stepchildren, and other children whom you support and who are under 18 (or of any age if unable to work due to disability); and (2) your legal spouse who is not employed or receiving unemployment benefits themselves. Former spouses, adult children who are employed, and domestic partners (without legal marriage) do not qualify. IDES requires you to certify the dependent information and may request documentation — birth certificates, marriage certificates — to verify eligibility for the allowance.
- What is the maximum total weekly payment from Illinois unemployment including dependency allowances?
- The maximum base weekly benefit is $628/week. The maximum dependency allowance is $92.50/week. Combined: $834.50/week maximum total payment. Since Illinois has no waiting week, the maximum total benefit amount for a 26-week claim at maximum base benefit plus maximum dependency allowance is $834.50 × 26 = $21,697. This places Illinois among the more generous states in the Midwest for both weekly amounts and total benefit potential. Workers with qualifying dependents should always claim dependency allowances — they represent substantial additional income over the 26-week benefit period.
- Illinois IDES shows a lower weekly benefit amount than I expected. Why?
- The most common reason is wage data discrepancies. IDES bases the calculation on wage records reported by your employers to the Illinois Department of Employment Security on a quarterly basis. If your employer underreported wages (common with employers who are late on quarterly filings), or if wages from a specific quarter are missing from IDES records, your calculated WBA will be lower than your actual earnings would produce. Request your base period wage statement from IDES Online and compare it to your W-2 and pay stubs for each quarter. If there is a discrepancy, submit a wage audit request through IDES Online with supporting documentation — IDES will contact your employer to reconcile the difference.
- How does part-time work affect my Illinois unemployment payment?
- Illinois allows you to earn up to 50% of your weekly benefit amount with no reduction to your benefit. If your WBA is $600 and you earn $250 (below 50% of $600 = $300), your benefit is not reduced at all — you receive the full $600 plus your $250 earnings, totaling $850 for the week. For earnings above 50% of your WBA, Illinois deducts 50% of the excess. If you earn $400 in a week with a $600 WBA: the first $300 (50% of WBA) is exempt; the remaining $100 excess is reduced by 50% (subtract $50 from benefit); your payment is $600 - $50 = $550. Your total weekly income: $550 benefit + $400 earnings = $950. Illinois's partial benefit formula is one of the more worker-friendly in the Midwest.