What Are Employee Pre-Tax Deductions? Types, Limits, and Pay Stubs

Pre-tax payroll deductions are amounts your employer subtracts from your gross pay before income and, in some cases, payroll taxes are calculated, so money you route to retirement, health coverage, or other qualified benefits is never taxed on the way in. The most common deferral limit for 2026 is $24,500 for 401(k) and similar retirement plans.¹ Because the deduction happens before withholding is computed, every dollar you contribute reduces your taxable wages by a dollar, and your take-home pay falls by less than the full contribution.

How the Pre-Tax Mechanic Works

When you enroll in a qualifying benefit during onboarding or open enrollment, you authorize your employer to redirect part of each paycheck before payroll runs its tax calculations. The employer withholds the amount from your gross earnings, sends it to the plan, insurer, or account provider, and then computes federal income tax on what remains. The IRS treats the diverted money as if you never received it, so it doesn’t appear in your taxable wages for the period.²

The timing is the whole point. If the deduction happened after taxes, you’d pay income tax on the full amount and contribute what was left. Pre-tax treatment flips that order.

The savings aren’t identical across benefit types. Health insurance premiums paid through a Section 125 cafeteria plan, plus FSA and HSA contributions, also escape the 6.2% Social Security tax and the 1.45% Medicare tax.³ Retirement plan deferrals into a 401(k) or 403(b) don’t. So a $100 health premium deduction saves more in total tax than a $100 retirement deferral, even though both cut your federal income tax by the same amount. Social Security tax applies only up to $184,500 in earnings for 2026;⁴ above that, the FICA piece of the savings disappears for the Social Security portion, though Medicare has no wage cap.

What You Can Pay For With Pre-Tax Dollars

Retirement Plans

Traditional 401(k) plans are the most common pre-tax retirement vehicle for private-sector employees. You choose how much to defer from each paycheck, and the money grows tax-deferred until you withdraw it. Section 403(b) plans work the same way and are available to employees of public schools, churches, and 501(c)(3) organizations.⁵ Government workers often have Section 457 plans with a similar structure. All three share the 2026 elective deferral ceiling of $24,500.¹ Withdrawals in retirement are taxed as ordinary income.⁶

Health Insurance Premiums and FSAs

Most employer-sponsored health insurance premiums are paid through a Section 125 cafeteria plan, letting the premium come out of gross pay. A Health Care Flexible Spending Account lets you set aside up to $3,400 in 2026 for out-of-pocket medical costs such as copays, prescriptions, and dental work, with up to $680 eligible to carry over into the next plan year. A Dependent Care FSA lets you contribute up to $5,000 per household (or $2,500 if married filing separately) toward child care or elder care.⁷ Both FSA types leave your paycheck before federal income tax and FICA.²

Health Savings Accounts

If you’re enrolled in a high-deductible health plan, you can contribute to an HSA on a pre-tax basis. The 2026 limit is $4,400 for self-only coverage and $8,750 for family coverage.⁸ People age 55 and older can add $1,000 as a catch-up. Unlike FSA balances, HSA funds roll over indefinitely and belong to you when you leave your employer. Employer contributions to your HSA are excluded from wages for income tax, Social Security, and Medicare.²

Commuter Benefits

Transportation fringe benefits let you use pre-tax dollars for transit passes and qualified parking through a compensation reduction agreement. For 2026, you can exclude up to $340 per month for transit and up to $340 per month for qualified parking, or $4,080 annually for each category if you max out every month.⁹

Pre-Tax vs. Roth Contributions

Many employers offer a Roth option alongside the traditional pre-tax 401(k) or 403(b). Roth contributions are the opposite arrangement: the money comes out of your pay after taxes are calculated, so you don’t get a tax break today. In exchange, qualified Roth withdrawals in retirement are tax-free, including all investment growth, provided you’re at least 59½ and the account has been open five years.¹⁰ If you’re early in your career and in a low bracket, Roth often wins. In peak earning years, pre-tax deferrals often make more sense. Splitting between the two is common.

Catch-Up Contributions at 50 and Older

Once you turn 50, the IRS lets you contribute above the standard limit to most retirement plans. For 2026, the catch-up amount for 401(k), 403(b), and governmental 457 plans is $8,000, bringing the total possible deferral to $32,500. Workers aged 60 through 63 get a higher catch-up of $11,250, for a ceiling of $35,750.¹ HSA catch-up contributions start at age 55, add $1,000, and are set by statute without an inflation adjustment.

What to Watch Out For

Early Withdrawals From Retirement Plans

Money you defer into a 401(k), 403(b), or 457 plan is meant for retirement. Pull it out before 59½ and you’ll owe ordinary income tax on the distribution plus a 10% early withdrawal penalty.¹¹ Exceptions exist for certain hardships, disability, and separation from service after age 55.

Non-Medical HSA Withdrawals

HSA funds used for anything other than qualified medical expenses face income tax plus a 20% penalty if you’re under 65.¹² After 65, the penalty goes away and non-medical withdrawals are simply taxed as ordinary income.

Over-Contributing

If you exceed the annual deferral limit, the excess must be returned to you by April 15 of the following year. Miss that deadline and the excess is taxed twice, once in the year contributed and again when distributed, and the late distribution may also trigger the 10% penalty.¹³ This most often catches people who switch jobs mid-year and contribute to two employer plans without adding up the totals.

Limits Imposed on High Earners

If you earned $160,000 or more in the prior year, the IRS classifies you as a highly compensated employee for retirement plan testing.¹⁴ Your employer’s plan must pass nondiscrimination tests, and when it fails, the employer may refund part of your contributions or cap your deferral below the standard $24,500. If you’ve received a notice that your 401(k) contribution was reduced or returned, this is almost certainly why.

Reading Pre-Tax Deductions on Your Pay Stub and W-2

Each pre-tax deduction appears as a separate line on your pay stub, labeled something like “401(k) Pre-Tax,” “Medical Premium,” or “HSA,” sitting between gross pay and net pay. If the amounts don’t match what you elected, flag it with payroll right away. Errors compound over pay periods.

At year-end, your W-2 makes the deductions official for tax filing. Box 1 shows federal taxable wages, already reduced by your pre-tax contributions, which is why Box 1 is lower than your total gross pay for the year. Box 12 breaks out the detail using letter codes:¹⁵

Code D: 401(k) elective deferrals
Code E: 403(b) salary reduction contributions
Code G: 457(b) deferrals
Code W: Employer and employee HSA contributions, including amounts you elected through a cafeteria plan

Compare the Box 12 amounts against the year-to-date totals on your final pay stub. If you worked for more than one employer during the year, add the Box 12 amounts from each W-2 so combined deferrals didn’t top $24,500. Catching an excess before the April 15 correction deadline avoids the double-taxation problem above.

2026 Pre-Tax Contribution Limits

401(k), 403(b), and governmental 457: $24,500; catch-up at age 50 and older adds $8,000; catch-up for ages 60 through 63 adds $11,250¹
HSA: $4,400 self-only, $8,750 family; catch-up at age 55 and older adds $1,000⁸
Health Care FSA: $3,400 per year, with up to $680 carryover
Dependent Care FSA: $5,000 per household, or $2,500 if married filing separately⁷
Commuter transit and qualified parking: $340 per month each⁹

These caps apply per person per year. Retirement plan deferrals are cumulative across all employer plans; FSA and HSA limits apply per individual regardless of how many accounts you hold.

1
Internal Revenue Service. 401(k) Limit Increases to $24,500 for 2026, IRA Limit Increases to $7,500
2
Internal Revenue Service. Publication 15 (2026), (Circular E), Employer’s Tax Guide
3
Internal Revenue Service. Topic No. 751, Social Security and Medicare Withholding Rates
4
Social Security Administration. Benefits Planner – Social Security Tax Limits on Your Earnings
5
Internal Revenue Service. IRC 403(b) Tax-Sheltered Annuity Plans
6
Internal Revenue Service. 401(k) Plans
7
Internal Revenue Service. Publication 503 (2025), Child and Dependent Care Expenses
8
Internal Revenue Service. Expanded Availability of Health Savings Accounts Under the One, Big, Beautiful Bill Act
9
Internal Revenue Service. Publication 15-B (2026), Employer’s Tax Guide to Fringe Benefits
10
Internal Revenue Service. Roth Comparison Chart
11
Internal Revenue Service. Retirement Topics – Exceptions to Tax on Early Distributions
12
Internal Revenue Service. Publication 969 (2025), Health Savings Accounts and Other Tax-Favored Health Plans
13
Internal Revenue Service. 401(k) Plan Fix-It Guide – Elective Deferrals Weren’t Limited to the Amounts Under IRC Section 402(g)
14
Internal Revenue Service. 2026 Amounts Relating to Retirement Plans and IRAs, as Adjusted
15
Internal Revenue Service. General Instructions for Forms W-2 and W-3 (2026) – Specific Instructions for Form W-2