What Are Pre-Tax Contributions and How Do They Work?

Pre-tax contributions are dollars your employer routes from your paycheck into a qualified retirement or savings account before federal income tax is calculated, which lowers the wages the IRS sees for the year. You pay less income tax now; you pay ordinary income tax later when the money comes out. For 2026, the headline cap most workers care about is $24,500 for a 401(k), 403(b), or governmental 457(b) plan, but several other accounts follow the same before-tax logic with their own limits and rules.

Which Accounts Work This Way

Employer-sponsored retirement plans are the most common route. A 401(k) covers most private-sector workers.1Office of the Law Revision Counsel. 26 USC 401 – Qualified Pension, Profit-Sharing, and Stock Bonus Plans Public schools, colleges, hospitals, and certain nonprofits use 403(b) plans; state and local government employers use 457(b) plans.2Investor.gov. 403(b) and 457(b) Plans All three work the same way in practice: you pick a percentage or dollar amount, your employer withholds it before figuring income tax, and the money lands in an investment account.

A Traditional IRA gets you the same result outside of an employer plan. The contribution leaves your bank account after payday, and you claim the deduction on your tax return, which effectively makes it pre-tax.3Office of the Law Revision Counsel. 26 USC 219 – Retirement Savings Whether the full amount is actually deductible depends on your income and whether a workplace plan covers you or your spouse.

Health Savings Accounts (HSAs) shelter money set aside for medical expenses.4Office of the Law Revision Counsel. 26 USC 223 – Health Savings Accounts Flexible Spending Accounts (FSAs) do the same for healthcare or dependent care, though most FSAs run on a use-it-or-lose-it schedule, with plans allowed to carry over up to $680 into 2026.5FSAFEDS. What Is the Use or Lose Rule? Qualified commuter benefits round out the list: if your employer offers a pre-tax transit or parking benefit, the IRS lets you exclude up to $340 per month for transit and $340 per month for parking in 2026.6Internal Revenue Service. Employer’s Tax Guide to Fringe Benefits (Publication 15-B)

How the Tax Break Actually Shows Up

When you contribute to a 401(k), 403(b), or 457(b), your employer subtracts the contribution from your pay before running federal income tax withholding. That money never lands in Box 1 of your W-2, so for income tax purposes the IRS treats it as though you never earned it that year.7U.S. General Services Administration. Explanation of 2025 IRS Form W-2, Wage and Tax Statement The result is a lower adjusted gross income, which can also help you qualify for other tax breaks that phase out at higher incomes.

Traditional IRA contributions get you to the same place through a different path. The money leaves your checking account after you’re paid, and the tax benefit arrives when you file your return and claim the deduction.

The FICA Wrinkle

Here’s the part most people miss. Pre-tax 401(k), 403(b), and 457(b) contributions still get hit with Social Security and Medicare (FICA) taxes. Your employer includes those deferrals in the Social Security and Medicare wage boxes on your W-2 even though the same dollars are excluded from your federal income tax wages.8Internal Revenue Service. Retirement Plan FAQs Regarding Contributions A $24,500 401(k) contribution saves you income tax but not the 7.65% in FICA.

HSA and FSA contributions made through a payroll cafeteria plan are the exception. Amounts your employer deducts before running payroll skip both income tax and FICA.9Internal Revenue Service. Publication 969, Health Savings Accounts and Other Tax-Favored Health Plans Contribute to an HSA on your own outside of payroll and you still get the income tax deduction, but the FICA break is gone.

2026 Contribution Limits

Each account has its own annual cap, and the IRS adjusts most of them for inflation.10Office of the Law Revision Counsel. 26 USC 415 – Limitations on Benefits and Contribution Under Qualified Plans For 2026:

The Super Catch-Up at Ages 60 to 63

Starting in 2025, the SECURE 2.0 Act created a higher catch-up limit for participants who turn 60, 61, 62, or 63 during the calendar year. For 2026, that super catch-up is $11,250 for 401(k), 403(b), and governmental 457(b) plans, replacing the standard $8,000 catch-up for that age band.11Internal Revenue Service. 401(k) Limit Increases to $24,500 for 2026, IRA Limit Increases to $7,500 Someone in that window can defer up to $35,750 in a single year. Turn 64 and you drop back to the standard $8,000 catch-up.

Who Can Contribute, and How Much Is Deductible

Anyone with earned income can contribute to a Traditional IRA. Whether you can actually deduct the contribution depends on your income and whether a workplace plan covers you.13Internal Revenue Service. IRA Deduction Limits For 2026 the deduction phases out at these modified AGI ranges:

  • Single filers covered by a workplace plan: $81,000 to $91,000
  • Married filing jointly, contributing spouse covered: $129,000 to $149,000
  • Married filing jointly, contributing spouse not covered but other spouse is: $242,000 to $252,000
  • Married filing separately, covered by a plan: $0 to $10,00011Internal Revenue Service. 401(k) Limit Increases to $24,500 for 2026, IRA Limit Increases to $7,500

Inside the range, you can deduct a partial amount. Above it, your Traditional IRA contribution isn’t deductible, though you can still contribute on an after-tax basis.

HSA eligibility is narrower. You can only contribute if you’re enrolled in a High Deductible Health Plan.4Office of the Law Revision Counsel. 26 USC 223 – Health Savings Accounts A general-purpose healthcare FSA disqualifies you from HSA contributions; if you want both, you’ll need a Limited Purpose FSA restricted to dental and vision expenses.14FSAFEDS. Limited Expense Health Care FSA

One thing worth checking now rather than later: if your employer launched a new 401(k) or 403(b) after December 29, 2022, the SECURE 2.0 Act generally required them to enroll you automatically at a default rate between 3% and 10%, increasing one point a year up to at least 10% (capped at 15%).15Federal Register. Automatic Enrollment Requirements Under Section 414A Government plans, church plans, businesses under three years old, and plans that existed before the law are exempt. You can change your rate or opt out through payroll, but you have to look.

What Happens When You Withdraw

Pre-tax contributions defer taxes; they don’t erase them. Every dollar you pull from a traditional 401(k), 403(b), 457(b), or Traditional IRA counts as ordinary income in the year you take it out. The bet is that your tax rate in retirement will be lower than it is now. Often true, not guaranteed.

Early Withdrawal Penalties

Take money out of a 401(k) or Traditional IRA before age 59½ and you’ll owe a 10% additional tax on top of the regular income tax.16Internal Revenue Service. Retirement Topics – Exceptions to Tax on Early Distributions SIMPLE IRA plans hit harder: withdrawals within the first two years of participation face a 25% penalty instead of 10%.

There are carveouts. Leave your job during or after the year you turn 55 and you can take distributions from that employer’s 401(k) without the 10% penalty (this doesn’t extend to IRAs). Public safety employees get the same break at age 50.16Internal Revenue Service. Retirement Topics – Exceptions to Tax on Early Distributions Other exceptions cover disability, certain medical expenses, and substantially equal periodic payments.

Required Minimum Distributions

The IRS won’t let you defer forever. Starting at age 73, you have to take required minimum distributions (RMDs) from traditional retirement accounts each year.17Internal Revenue Service. Retirement Topics – Required Minimum Distributions (RMDs) Your first RMD is due by April 1 of the year after you turn 73; every year after, the deadline is December 31. If you’re still working and your employer’s plan allows it, you can delay RMDs from that plan until you actually retire, but IRA RMDs start at 73 no matter what.

Miss an RMD and the penalty is 25% of the amount you should have withdrawn, dropping to 10% if you correct the shortfall within two years.17Internal Revenue Service. Retirement Topics – Required Minimum Distributions (RMDs) HSAs have no RMD requirement, which is what makes them unusually powerful for long-horizon savers who can afford to pay medical bills out of pocket and let the account grow.

What Happens If You Contribute Too Much

Going over the annual limit triggers penalties that compound until you fix it, and the fix depends on the account.

For a 401(k) or similar workplace plan, excess deferrals plus any earnings on them have to be distributed back to you by April 15 of the following year. Get the money back by that date and you only pay income tax on the excess in the year you contributed. Miss the deadline and you get taxed twice: once in the contribution year and again when the excess is finally distributed.18Internal Revenue Service. 401(k) Plan Fix-It Guide – Elective Deferrals Exceeded IRC Section 402(g) Limits

For a Traditional IRA, the penalty is a 6% excise tax on the excess amount for every year it sits in the account.19Internal Revenue Service. IRA Excess Contributions You stop the meter by withdrawing the excess plus earnings before your tax filing deadline, including extensions. People who change jobs mid-year and contribute to two workplace plans are the most common accidental over-contributors, because each employer’s payroll system only tracks its own plan.

How to Start

For a workplace plan, you complete a salary reduction agreement through HR or your payroll portal. You pick a percentage or flat dollar amount, confirm, and changes usually take effect on the next pay cycle. If your employer offers a match, contribute at least enough to capture the full match before you send money anywhere else. That match is a guaranteed return you don’t get back if you skip it.

For a Traditional IRA, you open an account with a brokerage or bank and contribute directly, either as a lump sum or automatic transfers. The deadline for IRA contributions is your tax filing deadline, so you can make 2026 contributions up until April 2027.

For an HSA, you contribute either through payroll deduction, which gets you the FICA break, or directly to your HSA custodian, in which case you claim the deduction on your return. Either way, keep an eye on the running total if both you and your employer are putting money in, so you don’t drift over the annual cap.