Are Imrf Contributions Pre Tax
Yes, regular IMRF (Illinois Municipal Retirement Fund) member contributions are made with pre-tax dollars. Your required contribution is deducted from your gross pay before federal and Illinois state income tax is calculated, lowering your taxable income each year.
The practical trade-off: you get an immediate tax break on every contribution year, but you will owe ordinary income tax on the entire pension benefit (contributions plus investment growth) when you start drawing it. The tax is deferred, not eliminated.
How Pre-Tax Treatment Changes Your Paycheck and W-2
Your employer deducts your IMRF member contribution directly from your paycheck before calculating income tax withholding. Because this deduction is pre-tax, your W-2 Box 1 (federal taxable wages) will be lower than your gross pay.
Example with concrete numbers: If your annual salary is $50,000 and your IMRF contribution rate is 4.5% ($2,250), your W-2 Box 1 will show roughly $47,750. You pay federal and state income tax only on that lower figure.
Verification step on your pay stub: Look for the deduction line labeled “IMRF” or “RETIREMENT.” On most pay stubs, pre-tax deductions appear in a separate section above the tax calculation lines. If the IMRF amount is listed under “Pre-Tax Deductions” or “Before-Tax Deductions,” it is pre-tax. If it appears under “After-Tax Deductions,” contact your payroll department immediately — that likely indicates a setup error because the standard IMRF plan requires pre-tax treatment under IRS Section 414(h)(2).
The One Exception That Changes the Practical Answer
The “yes” answer applies to your mandatory IMRF member contribution only. The answer shifts if any of these apply:
- Roth supplemental plan (457(b) or 401(k)): Some employers offer a separate voluntary plan where you can elect after-tax Roth contributions. Those are not IMRF contributions — they are a different account with after-tax treatment.
- Voluntary additional contributions within IMRF: IMRF allows members to make additional voluntary contributions (AVCs) in limited cases. These may be pre-tax or after-tax depending on the plan document. Check your IMRF account online at imrf.org under “Contribution Summary” for the designation.
- Refund of contributions before retirement: If you leave IMRF employment and take a refund, the entire amount (including your own contributions) is taxable as ordinary income in the year received, plus a 10% penalty if under age 59½ unless an exception applies. The pre-tax deferral fully reverses.
What can go wrong: If your employer mistakenly deducts your IMRF contribution after tax, you lose the tax deferral benefit and your pension will be partially tax-free at retirement (your own contributions become basis). This is rare but happens. Check your pay stub at least once per quarter to confirm the deduction is in the pre-tax section.
What Happens at Retirement: The Tax Bill Is Real
Because your mandatory contributions entered the fund pre-tax, every dollar you receive as a monthly IMRF pension is fully taxable as ordinary income at the federal level and at the Illinois state level (Illinois generally taxes pension income, with some exclusions for retirees age 65 and older).
Form 1099-R: IMRF will issue you a 1099-R each year. Box 1 shows the gross distribution. Box 2a shows the taxable amount. For standard pre-tax contributions, Box 2a equals Box 1 — there is no tax-free cost basis.
Concrete trade-off example: Suppose you retire with a $40,000 annual IMRF pension. If you have no other income, that $40,000 is fully taxable. If you also collect Social Security of $20,000, part of your Social Security may become taxable too, pushing your effective tax rate higher than you expected. This is the downside of pre-tax contributions when you have multiple income streams in retirement.
How to Confirm Your Contribution Type on Your Pay Stub and Online
You don’t need to guess. Use these three checks:
1. Pay stub deduction location: Find the line “IMRF” or “IMRF CONTRIB.” If it appears in the pre-tax deduction section (often grouped with health insurance or FSA), it is pre-tax. If it appears in the after-tax section, flag it with payroll.
2. W-2 comparison: Box 1 (federal taxable wages) should be lower than Box 3 (Social Security wages) by roughly your annual IMRF contribution. Box 3 includes your IMRF contribution because Social Security tax still applies to full gross wages — but Box 1 does not include the IMRF amount.
3. IMRF member account: Log in at imrf.org, go to “Contribution Summary.” Contributions labeled “Member – Mandatory” with notation “Pre-Tax” or “Tax-Deferred” confirm your pre-tax treatment.
What to Watch For with Pre-Tax IMRF Contributions
Tip 1: Confirm your contribution rate each year
Your IMRF rate is 4.5% for both Tier 1 (hired before Jan 1, 2011) and Tier 2 (hired on or after Jan 1, 2011) in most cases, but some employers have elected different rates for specific employee groups. A 0.5% change alters your tax deferral and take-home pay.
Common mistake: Assuming the rate is permanent. Check your annual benefit statement from IMRF and compare the rate shown to your pay stub deduction percentage.
Tip 2: Understand that pre-tax does not mean FICA-free
Your IMRF contributions reduce your federal and state income tax, but they do not reduce Social Security or Medicare taxes. Your employer reports your full gross wages (including the IMRF deduction) to the SSA. You still pay the full 6.2% Social Security tax and 1.45% Medicare tax on your entire salary.
Common mistake: Expecting lower FICA taxes because of a pre-tax deduction. Check your pay stub: Social Security and Medicare tax calculations should be based on your gross wages, not your reduced taxable wages.
Tip 3: Factor Illinois state tax rules into your planning
Illinois taxes pension income, but retirees age 65 or older can exclude up to a certain amount (the exclusion is adjusted periodically — check current year’s limit on the Illinois Department of Revenue website). If your pre-tax contributions push your pension above that threshold, you lose the exclusion benefit. If your employer offers a Roth supplemental plan, the Roth option may be more valuable if you expect to exceed the exclusion amount.
Common mistake: Ignoring state tax treatment when evaluating pre-tax vs. Roth options. Federal deferral gets the attention, but Illinois state tax on pension income can change the net outcome, especially if you retire before age 65.
Quick Decision Aid: Pre-Tax vs. After-Tax IMRF Contributions
Use these five checks to evaluate whether your current pre-tax arrangement fits your situation:
| Check | What to Look For | Pass (Pre-Tax Likely Fits) | Fail (Consider Roth or Review) |
|---|---|---|---|
| Current federal tax bracket | Are you in the 22% bracket or higher? | Pre-tax gives you tax savings now | Roth may be better if you are in a low bracket now |
| Expected retirement bracket | Will you be in a lower bracket in retirement? | Pre-tax works in your favor | Roth may be better if you expect same or higher bracket |
| Illinois residence at retirement | Will you live in Illinois? | Pre-tax is fine; factor state tax | If you move to a state with no income tax, the tax deferral still matters at federal level |
| Retirement age | Will you be 65 or older when you start drawing? |
| Pre-tax still works; state exclusion may reduce impact | Under 65: no Illinois exclusion, so pre-tax pension is fully taxable |
| Roth alternative available | Does your employer offer a Roth 457(b) or 401(k)? | Pre-tax is your only mandatory option, but you can choose Roth for supplemental savings | No Roth option → pre-tax is the only path for mandatory contributions |
How to use this table: Go through each check. If most answers point to “Pre-Tax Likely Fits,” your current arrangement is appropriate. If most point to “Consider Roth or Review,” talk to your HR about whether a supplemental Roth plan exists and whether you can allocate additional savings there.
Important limitation: IMRF itself does not offer a Roth option for the mandatory member contribution. The Roth alternative, if available, comes through a separate voluntary plan offered by your employer. You cannot switch your mandatory IMRF contribution to after-tax mid-year.
When You Should Escalate to a Professional
Consult a tax professional or fee-only financial planner who understands Illinois public pension rules if:
- You are within three years of retirement and want to model the combined tax impact of your IMRF pension, Social Security, and other income.
- You are considering leaving Illinois and want to roll your IMRF contributions to another retirement account — rollover rules differ from a standard 401(k).
- You have made both pre-tax mandatory contributions and after-tax voluntary contributions at different points and need to track separate tax bases.
- You have withdrawn your IMRF contributions in the past and are reemployed by a participating employer — the re-entry rules affect contribution tax treatment.
The answer to “are IMRF contributions pre tax” is yes for the standard mandatory contribution. But the real question is whether that arrangement works best for your full financial picture. Verify your pay stub, check your tier, and factor in state tax rules before making any changes to your retirement savings strategy.
Frequently Asked Questions
Can I change my IMRF mandatory contribution from pre-tax to Roth?
No. The mandatory IMRF member contribution is pre-tax by plan design under IRS Section 414(h)(2). You cannot elect Roth treatment on this deduction. If you want after-tax savings, use a separate employer-sponsored supplemental plan (457(b) or 401(k)) that offers a Roth option.
Do IMRF contributions reduce my Illinois state income tax?
Yes. Illinois starts its tax calculation from your federal adjusted gross income. Because pre-tax IMRF contributions reduce your federal AGI, they reduce your Illinois taxable income as well.
What if I leave IMRF employment and take a refund of my contributions?
If you withdraw your contributions before retirement, IMRF issues a Form 1099-R showing the full refund as taxable income. Because the contributions were pre-tax, there is no cost basis to exclude. You may also owe a 10% early distribution penalty if you are under age 59½.
Are IMRF contributions pre-tax for Medicare purposes?
No. IMRF contributions reduce income tax only. Your full gross wages (including the IMRF deduction) are subject to Medicare tax (1.45% employee share) and Social Security tax (6.2% employee share) for most participants. Some IMRF employers are non–Social Security participants — check your pay stub for FICA deductions.
Does the pre-tax treatment apply to both Tier 1 and Tier 2 members?
Yes. Both Tier 1 (hired before January 1, 2011) and Tier 2 (hired on or after January 1, 2011) members have pre-tax treatment on their mandatory IMRF contributions. The contribution rate is the same (4.5%), though the benefit formulas differ between tiers.
Explore This Topic
- Back to Us State Pension Tax
- Back to Us State Pension Tax
Related guides in this cluster:
Michael Reynolds is a retirement benefits researcher and the lead author at Pension FAQ. With over 12 years of experience analyzing employer pension plans, state retirement systems, and Social Security policy, he specializes in translating complex pension rules into clear, actionable guidance for American workers and retirees.
Michael holds a Bachelor’s in Economics from the University of Michigan and has completed the Certified Retirement Counselor (CRC) program. His work has been cited by financial planners and HR professionals helping employees navigate their pension options.
At Pension FAQ, Michael leads a team covering employer plan access, state pension taxation, teacher and public employee retirement systems, professional sports pensions, and pension calculation rules. All content is rigorously reviewed against official plan documents and IRS guidelines.
Disclaimer: Pension FAQ content is for educational purposes only and does not constitute financial, tax, legal, or retirement benefits advice. Always consult your plan administrator or a qualified professional for decisions about your specific situation.