The short version
- A Section 125 deduction comes out before federal and Iowa income tax and the 7.65% Social Security and Medicare tax. The district skips its matching 7.65% too.
- IPERS wages don't go down. Iowa law counts pay before Section 125 deductions, so pension contributions stay on the full salary.
- The plan has to be written and adopted before the plan year starts, or the deductions are taxable.
- Running disability or indemnity premiums pre-tax makes the benefit taxable when it pays out. Decide that on purpose.
What the deduction saves
Money run through the plan isn't wages for federal income tax and generally isn't subject to Social Security and Medicare tax.1 That is 6.2% plus 1.45%, on both the employee's and the district's side.2 Iowa withholding follows the same wages, so Iowa tax is saved as well.3 IPERS supplements Social Security rather than replacing it, so school employees pay FICA and get this saving.4
| Item | Arithmetic | Per year |
|---|---|---|
| Employee Social Security and Medicare | 7.65% of $4,200 | $321.30 |
| Employee federal income tax | 12% of $4,200 | $504.00 |
| Employee saves, before Iowa income tax | $825.30 | |
| District Social Security and Medicare | 7.65% of $4,200 | $321.30 |
Across 150 employees like this one, the district owes $48,195 less in payroll tax each year.
Why IPERS wages stay the same
Iowa Code defines IPERS-covered wages as pay before employee contributions to plans under sections 125, 129, 401, 403, 408 and 457.5 In the example, IPERS contributions still run on the $4,200: $264.18 from the employee at 6.29% and $396.48 from the district at 9.44%.6 The pension isn't reduced.
If payroll subtracts Section 125 deductions before figuring IPERS, it's set up wrong and both sides are underpaying.
Social Security is the exception. Slightly less is posted to the employee's earnings record, which the federal government tells its own staff "may result in somewhat lower Social Security benefits."7 For most people the yearly tax saving is worth far more, but it's a fair question to answer straight.
District money and cash in lieu
| Arrangement | IPERS-covered wages? |
|---|---|
| Employee's own pre-tax deduction | Yes |
| District-paid premium the employee cannot take as cash | No |
| Flex dollars or waiver cash that every employee in the group may take | Yes, for the part not required to go to coverage |
| Waiver cash offered only to employees who prove they have other coverage | No |
Cash an employee could take instead of coverage counts when it is offered uniformly and not limited to highly paid staff.5 The IPERS rule's own example: the district gives $2,500 and requires $1,000 for single coverage, so the other $1,500 is covered wages whether or not anyone takes it as cash. If cash is only for employees who prove other coverage, none of it is covered.8
Also check: if the district doesn't certify its Section 125 plan to IPERS, all employer fringe-benefit contributions are excluded from coverage.8 IPERS proposed in 2026 to re-adopt this chapter under new rule numbers; the text was unchanged as of October 1, 2026.9 Run any change to a flex or cash-in-lieu design past IPERS first.
What can go through the plan
- Allowed: employee share of health, dental and vision premiums; health FSA up to $3,400 (2026 plan years); dependent care FSA up to $7,500; HSA contributions; group-term life on the employee; disability; accident, hospital indemnity and specified-disease policies.10,11 HSA money run through the plan also skips FICA.12
- Not allowed: long-term care insurance, 403(b) deferrals, life insurance on a spouse or child. Offering one disqualifies the plan.11
Disability and indemnity: pre-tax isn't always better
Pay a disability premium pre-tax and the benefit is fully taxable; pay it after tax and the benefit is tax-free.13 Pre-tax saves a 12%-bracket employee about $94 a year on a $40 monthly premium. A taxable $2,000 monthly benefit loses more than that in its first month. Many plans keep disability after-tax, and a cafeteria plan can offer the choice.11
Accident, hospital indemnity and critical illness policies raise the same issue. IRS Chief Counsel has concluded that fixed-indemnity payments are taxable when premiums went through Section 125.14,15 Those memos aren't precedent, and Treasury declined to finalize a proposed rule on it in 2024,16 but the district should know which premiums are coded pre-tax and why.
What keeps the plan valid
- Written and adopted first. No document, or operating differently than it says, makes elections taxable.11
- Elections locked for the year, except for life events the plan document lists (marriage, birth, job change and similar). Cost or coverage changes can't change a health FSA election.17
- No tilt toward the highest paid. A plan under a collective bargaining agreement is treated as passing this test.10
Five questions before the next plan year
- Is the plan document signed, dated before the plan year, and updated for the $7,500 dependent care limit?
- Does payroll figure IPERS on wages before Section 125 deductions?
- Has the Section 125 certification been filed with IPERS this year?
- Which voluntary premiums run pre-tax, and was that a deliberate choice?
- If there are flex dollars or cash in lieu, does payroll split covered and non-covered amounts the way the IPERS rule says?