Illinois State Police Salary: Ranks, Raises, and Retirement

An Illinois State Police salary starts at $84,420 for a first-year trooper as of July 1, 2024, with cadets paid $3,968 per month during academy training and scheduled raises pushing the base higher each year through June 2027. On top of base, troopers earn shift differentials, hazardous duty pay, longevity stipends, and overtime, and they qualify for a defined-benefit pension through the State Employees’ Retirement System with earlier eligibility than most state workers.

Cadet and Starting Pay

Cadets earn a salary while they train. During the academy, they receive lodging, meals, supplies, and equipment, plus $3,968 per month, which annualizes to roughly $47,600.¹ Many law enforcement agencies pay nothing during academy training or expect self-sponsorship, so this matters at the entry point.

Once a cadet graduates and enters active duty, base salary moves to $84,420 as of July 1, 2024.¹ That is the fiscal year 2025 rate under the current bargaining agreement and does not include overtime, shift differentials, or other supplements.

Scheduled Raises Through 2027

The current agreement between the state and Troopers Lodge No. 41 of the Fraternal Order of Police runs from July 1, 2023 through June 30, 2027 and sets across-the-board base salary increases for all covered officers:

Fiscal Year 2024: 4.00% effective July 1, 2023, plus 2.50% effective January 1, 2024
Fiscal Year 2025: 4.00% effective July 1, 2024
Fiscal Year 2026: 3.95% effective July 1, 2025
Fiscal Year 2027: 3.50% effective July 1, 2026

Applying the 3.95% July 2025 increase to the published $84,420 first-year base puts the estimated first-year salary at roughly $87,755, and the July 2026 increase would bring it to approximately $90,825.² The ISP publishes official figures at the start of each fiscal year. A separate agreement covers lieutenants and captains for the same four-year period.³

Pay by Rank

Compensation climbs with promotion, and much of an ISP career’s earning power sits in rank progression and longevity. The Illinois Comptroller’s salary database shows the following 2024 gross earnings for personnel at various ranks:

Trooper First Class: roughly $114,500
Master Sergeant: roughly $159,400 to $185,100
Lieutenant: roughly $174,400

These are gross totals that include overtime, shift differentials, and other supplements, so they run higher than base pay for each rank.⁴

Shift Differentials, Hazardous Duty, and Longevity

Several forms of supplemental pay sit on top of base salary and add up over a year.

Shift Differentials

Officers permanently assigned to the midnight shift (at least half the scheduled hours between 11 p.m. and 7 a.m.) receive an extra $1.25 per hour for all hours worked. Officers on the afternoon shift (at least half the hours between 3 p.m. and 11 p.m.) receive an extra $0.75 per hour.² For a full schedule on midnights, that adds roughly $2,600 per year before overtime.

Hazardous Duty Pay

As of July 1, 2024, every officer receives a $625 annual stipend for hazardous duty plus a monthly stipend of $225. Together that totals $3,325 per year.²

Longevity Stipend

Officers who have passed the 21-year step on the salary schedule receive an additional $25 per month.²

Overtime

Overtime is often one of the largest components of total compensation, which is why the Comptroller’s gross figures run so far above base salary. The Fair Labor Standards Act uses a special rule for law enforcement under Section 7(k): instead of the standard 40-hour weekly threshold, the agency can use a work period of 7 to 28 consecutive days, with overtime triggered after 171 hours in a 28-day period or a proportional number for shorter periods. The rate is at least one and a half times regular pay.⁵

Public employers may also offer compensatory time off at the same time-and-a-half rate. Law enforcement employees can accumulate up to 480 hours of comp time.⁵ Illinois state overtime rules mirror or exceed the federal floor.⁶ The CBA separately guarantees a two-hour minimum of overtime pay for officers called out for interpreter duties, and other callback and court-time provisions run throughout the agreement.

Retirement Through SERS

ISP officers participate in the State Employees’ Retirement System and qualify for the alternative formula, which offers earlier retirement eligibility and a more generous benefit than the regular SERS formula. The tier depends on when the officer joined SERS.

Tier 1 Alternative Formula

Officers who became SERS members before January 1, 2011 fall under Tier 1. They can retire at age 50 with 25 years of service, or at age 55 with 20 years of service. The formula pays 2.5% of final average compensation per year of service for coordinated employees (also covered by Social Security) and 3.0% per year for non-coordinated employees, up to a maximum of 75% of final average compensation. Final average compensation uses the highest consecutive months of pay within the last 48 months of service.⁷

Tier 2 Alternative Formula

Officers who joined SERS on or after January 1, 2011 are in Tier 2. State police officers can retire at age 55 with 20 years of alternative formula service credit. The accrual rate is the same as Tier 1, and the maximum benefit is 80% of final average compensation. Tier 2 calculates final average compensation over the 96 highest consecutive months within the last 120 months of service, and the pensionable salary is capped at an annually adjusted ceiling.⁸

The annual increase in retirement also differs. Tier 2 retirees receive a yearly increase of 3% or half the Consumer Price Index, whichever is less, beginning after the later of their first full year of retirement or their 67th birthday.⁸ The CPI-linked cap can significantly affect purchasing power across a long retirement.

Health Insurance and Other Benefits

Officers receive state health insurance covering medical, dental, and vision care through group plans administered by CMS, with multiple plan options that vary by benefit level, network, and out-of-pocket cost. Plan details change annually during open enrollment. The bargaining agreement also includes paid vacation, sick leave, personal days, and coverage for hearing exams and hearing aids (up to $150 for audiologist fees and $600 for hearing aids once every three years).²

Public Service Loan Forgiveness

Full-time ISP officers qualify for Public Service Loan Forgiveness. After 120 qualifying monthly payments on eligible federal Direct Loans while employed full-time in a public service job, the remaining balance is forgiven, and law enforcement employment counts.⁹ Payments do not need to be consecutive, but each must be made in full and no more than 15 days after the due date. Payments made during deferment, forbearance, or default do not count. Only Direct Loans and Direct Consolidation Loans qualify, so officers holding older FFEL or Perkins loans would need to consolidate first.

Tax Break for Retired Officers

Under 26 U.S.C. § 402(l), eligible retired public safety officers can exclude up to $3,000 per year from gross income when distributions from an eligible retirement plan are used to pay health, accident, or long-term care insurance premiums.¹⁰ Married couples where both spouses are retired public safety officers filing jointly can reach a $6,000 combined exclusion. The distribution must go directly from the retirement plan to the insurance provider.

Federal Line-of-Duty Benefits

ISP officers are covered by the federal Public Safety Officers’ Benefits program. If an officer dies or becomes permanently and totally disabled as a direct result of a line-of-duty injury, PSOB pays a lump-sum benefit set at $461,656 for fiscal year 2026.¹¹ Payment goes to survivors in a statutory priority order: surviving spouse, children, designated beneficiaries, or parents.¹²

PSOB also provides educational assistance to the spouse and children of officers killed or permanently disabled in the line of duty. As of October 2025, the monthly educational assistance benefit for full-time study is $1,574.¹¹ Retired officers who are targeted and killed or disabled because of their former service are also eligible under a provision added for retired law enforcement.

1
Illinois State Police. Trooper Benefits and Resources
2
Illinois Department of Central Management Services. Collective Bargaining Agreement Between Illinois State Police and Troopers Lodge No. 41
3
Illinois Department of Central Management Services. Collective Bargaining Agreement – Illinois State Police Lieutenants and Captains
4
Illinois Comptroller. Salary Database – Department of State Police
5
U.S. Department of Labor. Fact Sheet 8 – Law Enforcement and Fire Protection Employees Under the Fair Labor Standards Act
6
Illinois Department of Labor. Fair Labor Standards Act Exemptions
7
State Employees’ Retirement System of Illinois. Tier 1 Alternative Formula
8
State Employees’ Retirement System of Illinois. Tier 2 Alternative Formula
9
Office of the Law Revision Counsel. 20 USC 1087e – Terms and Conditions of Loans
10
Office of the Law Revision Counsel. 26 USC 402 – Taxability of Beneficiary of Employees Trust
11
Bureau of Justice Assistance. Benefits by Year
12
Office of the Law Revision Counsel. 34 USC 10281 – Payment of Death Benefits