Illinois Teacher Salary & TRS Guide

The statutory minimum salary

Illinois sets a floor under teacher pay by statute. Public Act 101-0443 raised it in annual steps to $40,000 for the 2023-24 school year and then indexed it to CPI-U, with the Commission on Government Forecasting and Accountability certifying each subsequent year's figure:

Two things about that table are frequently misread. It is a floor, not a typical salary — the great majority of Illinois districts pay materially above it, and salary schedules vary widely between districts by lane and step. And it is indexed rather than fixed, so it rises every year without further legislation, which is the opposite of the state minimum wage, where the schedule ran out in 2025 with no indexing behind it.

For an actual average, the Illinois State Board of Education publishes teacher salary data by district and statewide through the Illinois Report Card. We deliberately do not reproduce a figure here that we could not verify against that source, and when you do look it up, note the school year — this data always describes a year that has finished.

The 9% that replaces Social Security

The single biggest difference between a teacher's paycheck and a private sector one is that Illinois public school teachers outside Chicago do not pay Social Security on their teaching work. They contribute 9.0% of creditable earnings to TRS instead — 7.5% toward the retirement annuity, 0.5% toward annual increases and 1.0% toward death benefits — while Medicare at 1.45% still applies.

Comparing 9.0% against a private worker's 6.2% Social Security deduction is not a fair comparison in either direction. The TRS benefit is generally far more generous than Social Security at the same earnings; on the other hand, Social Security carries disability and survivor protections and full portability that a state pension does not, and a teacher who leaves before vesting walks away with contributions rather than a benefit. The right comparison is between total retirement packages, not payroll lines.

One recent federal change is widely misunderstood. The Social Security Fairness Act, signed in January 2025, repealed the Windfall Elimination Provision and the Government Pension Offset. That matters a great deal for teachers who earned Social Security credit in other jobs, or who are entitled to a spousal benefit — those benefits are no longer reduced because of the TRS pension. It does not make teaching Social Security covered, it does not change TRS benefits, and it does not affect the 9% contribution.

The TRS pension formula

TRS uses a 2.2% multiplier per year of service applied to final average salary, with a maximum of 75% of that salary, reached at 34 years. What changes between tiers is everything around the multiplier:

The structure will look familiar to anyone who has read about the state employee system — the tier line falls on the same date, the Tier 2 salary cap is the same figure, and the annual increase is reduced the same way. The SERS pension calculator models the state employee version, and the mechanics translate directly. Senate Bill 2 in the current General Assembly would align Tier 2 with Tier 1 across TRS, SERS and SURS together, at a cost the Commission on Government Forecasting and Accountability has put at roughly $29.8 billion through fiscal 2045. It has not been enacted.

What a teaching salary leaves you

A $65,000 salary paid semi-monthly is $2,708.33 gross per check. For a single filer with no dependents, federal withholding takes about $234.17 and Illinois takes $134.06. FICA is where the teacher's stub departs from the general case: instead of $207.19 in Social Security and Medicare, a TRS member pays only Medicare — about $39.27 — plus the 9% TRS contribution of $243.75.

The calculator above is the general Illinois engine, so to model a teaching paycheck accurately, enter the TRS contribution as a pre-tax retirement deduction and mentally set the Social Security line aside. The TRS contribution reduces federal and Illinois taxable income in the same way a 401(k) does. Anything you also put into a 403(b) or 457(b) plan on top comes off before income tax as well.

Tax in retirement

Illinois is unusually good to retired teachers. TRS pensions qualify for the retirement income subtraction on Line 5 of Form IL-1040, so the state taxes none of it, with no income limit and no partial exclusion. The same treatment covers 403(b) and 457(b) withdrawals and IRA distributions. Federally the pension is fully taxable.

Where it gets interesting is for teachers who also have Social Security from other employment. With the Windfall Elimination Provision repealed, those benefits now pay in full — but how much of them becomes federally taxable still depends on the provisional income test, and a TRS pension counts toward provisional income. A teacher with a substantial pension plus a modest Social Security benefit can find most of the benefit taxable. The Illinois retirement taxes calculator runs the pension, the Social Security and any withdrawals together, which is the only way to see that interaction properly.