RetirementCalcByState
🏙️ IL Pre-Filled
Illinois State Pension
Retirement Calculator 2026
Calculate your estimated State Employees’ Retirement System of Illinois retirement benefit using the official formula. Illinois’s 2026 rates are pre-loaded.
Formula: Years of Service × Final Average Salary × 1.67% = Annual Pension
1.67%
Benefit Multiplier
3-year average
Final Avg Salary
10 yrs
Vesting Period
+SS
Social Security
🏛️ SERS Calculator
Illinois Pension Benefit Estimator
Enter your years of service and final average salary — Illinois’s 1.67% multiplier is already loaded.
$
Using 3-year average
✓ Pre-filled — Illinois 2026 rate
Annual Pension
—
Per year
Monthly Pension
—
Per month
Replacement Rate
—
% of final salary
Calculation Breakdown
Years of Service—
Final Average Salary—
Benefit Multiplier1.67%
Annual Pension Benefit—
Income Replacement0%
⚠️ This is an estimate based on the standard State Employees’ Retirement System of Illinois formula. Actual benefits may vary based on your specific tier, early retirement reductions, survivor benefit elections, and other factors. Contact State Employees’ Retirement System of Illinois for an official benefit estimate.
🏛️ State Employees’ Retirement System of Illinois Facts
Benefit Multiplier
1.67% per year
Final Avg Salary
3-year average
Retirement Rule
Age 67 with 10 years (Tier 2); Age 60 with 8 years (Tier 1)
Vesting Period
10 years
Employee Contribution
4% of salary
Employer Contribution
39.2% of salary
Social Security
Yes — members also receive Social Security
COLA
Yes — automatic annual COLA
System Overview
Illinois has the most underfunded state pension system in the US — total unfunded liabilities exceed $200 billion.
What to Know About Illinois Retirement
- →Illinois has the worst-funded pension system in the US — unfunded liabilities exceed $200 billion.
- →Illinois’ constitutional pension protection clause makes it extremely difficult to reform benefits, even with the funding crisis.
- →The standard pension formula is: Years of Service × Final Average Salary × 1.67%. For a 30-year employee earning $65,000/year, this means $32,565/year in annual pension benefits.
Frequently Asked Questions
How is the Illinois pension calculated?
The State Employees’ Retirement System of Illinois uses this formula: Years of Service × Final Average Salary × 1.67%. Your “final average salary” is based on your 3-year average. For example, with 25 years of service and a $60,000 final average salary: 25 × $60,000 × 0.0167 = $25,050 per year.
When can I retire with a full pension in Illinois?
Full retirement eligibility in Illinois: Age 67 with 10 years (Tier 2); Age 60 with 8 years (Tier 1). You may be able to retire earlier with a reduced benefit — contact State Employees’ Retirement System of Illinois directly for your specific eligibility date based on your hire date and tier.
Does Illinois pension replace Social Security?
Illinois pension members also participate in Social Security. You will receive both your state pension AND Social Security benefits in retirement — two separate income streams.