401(k) Contributions: Paycheck Deductions, Limits, and Match

401(k) contributions and payroll deductions work through a standing instruction you give your employer: withhold a set percentage or dollar amount from each paycheck and send it to your retirement plan account. For 2026, the IRS caps what you can defer from your own salary at $24,500.1Internal Revenue Service. 401(k) Limit Increases to $24,500 for 2026, IRA Limit Increases to $7,500 The money leaves your gross pay before you see it, which is the point. What varies is how it’s taxed, when your employer’s match becomes yours to keep, and what it costs to pull the money back out before retirement.

How the Deduction Moves From Paycheck to Account

Once you pick a deferral percentage or dollar amount through your benefits portal, your employer withholds that figure from your gross pay each pay period. For pre-tax contributions, the deduction happens before income tax withholding is calculated, so your taxable wages on that paycheck are lower. Social Security and Medicare taxes still apply to the full amount, though. Choosing pre-tax saves you income tax, not payroll tax.2Internal Revenue Service. Retirement Plan FAQs Regarding Contributions – Are Retirement Plan Contributions Subject to Withholding for FICA, Medicare or Federal Income Tax?

Federal law requires employers to deposit withheld contributions into the plan trust as soon as the money can reasonably be separated from company funds. The outer limit is the 15th business day of the month after the paycheck date. For small plans with fewer than 100 participants, deposits made within seven business days are automatically treated as timely under a regulatory safe harbor.3eCFR. 29 CFR 2510.3-102 – Participant Contributions Larger employers that can process faster are expected to. If your pay stub shows a retirement deduction but your plan balance hasn’t updated after a couple of weeks, that’s worth raising with HR or the plan administrator.4U.S. Department of Labor. FAQs About Retirement Plans and ERISA

Every dollar you contribute from your own paycheck is 100% vested immediately. That money is yours regardless of how long you stay with the employer.5Office of the Law Revision Counsel. 29 U.S. Code 1053 – Minimum Vesting Standards

When your W-2 arrives in January, your employer reports pre-tax deferrals with code D in Box 12 and Roth deferrals with code AA.6Internal Revenue Service. 2026 General Instructions for Forms W-2 and W-3 Those codes are how the IRS tracks which bucket the money went into. Check them.

Pre-Tax or Roth: The Choice That Shapes Decades

Most plans let you split your contributions between traditional (pre-tax) and Roth (after-tax) buckets, and the choice changes when you pay income tax on the money.

Traditional contributions come out of your paycheck before federal and state income taxes are calculated. Your taxable income drops in the year you contribute, and you pay income tax later, when you take distributions in retirement. Roth contributions work in reverse: income tax comes out of your paycheck first, the money goes into the plan after tax, and qualified withdrawals in retirement come out with no additional tax.7Internal Revenue Service. 401(k) Plan Overview

Both types are subject to FICA at the time of the deferral, so the payroll tax hit on your paycheck is identical either way. The difference is entirely on the income tax side.

How Much You Can Put In for 2026

The employee deferral cap for 2026 is $24,500 across all 401(k) plans you participate in during the year.1Internal Revenue Service. 401(k) Limit Increases to $24,500 for 2026, IRA Limit Increases to $7,500 If you switch jobs mid-year, the new employer’s payroll system has no way of knowing what you already deferred at the old one, so the running total is on you.

Catch-up contributions let older workers add more:

  • Age 50 and older: an extra $8,000, for an employee total of $32,500.
  • Ages 60 through 63: an extra $11,250 instead of the standard catch-up, for an employee total of $35,750. This higher tier took effect in 2025 under SECURE 2.0.
  • Age 64 and older: back to the standard $8,000 catch-up.

Once employer contributions are added in, the combined 2026 ceiling is $72,000, or $80,000 with a standard catch-up, or $83,250 for those in the 60-to-63 window.8Internal Revenue Service. COLA Increases for Dollar Limitations on Benefits and Contributions

Starting in 2026, if you earned more than $145,000 in FICA wages from your employer in the prior year, your catch-up contributions must go into the Roth bucket. You cannot make them pre-tax. Workers below that wage threshold can still choose either treatment for catch-up dollars. Regular deferrals up to $24,500 are unaffected by this rule.

Exceed the annual limit and you need to pull the excess out by April 15 of the following year, along with any earnings on it. Miss that deadline and the excess gets taxed twice: once in the year you contributed it and again when it eventually comes out of the plan.9Internal Revenue Service. 401(k) Plan Fix-It Guide – Elective Deferrals Werent Limited to the Amounts Under IRC Section 402(g)

The Employer Match and When It’s Actually Yours

Many employers match a portion of what you defer. A common formula is 50 cents on every dollar up to 6% of your salary, though formulas vary widely.10Internal Revenue Service. Matching Contributions Help You Save More for Retirement Contributing less than the amount needed to capture the full match leaves compensation on the table.

Employer match dollars are usually subject to a vesting schedule. Federal law permits two basic structures:11Internal Revenue Service. Issue Snapshot – Vesting Schedules for Matching Contributions

  • Cliff vesting: you own 0% of the match until you complete three years of service, then you’re 100% vested all at once.
  • Graded vesting: you vest 20% after two years and gain 20% each year until you reach 100% after six years.

Safe harbor 401(k) plans that aren’t set up as a qualified automatic contribution arrangement must vest matching contributions immediately, and SIMPLE 401(k) matches are fully vested from day one. If you’re weighing a job change, check your plan’s summary to see where you stand on the vesting schedule before you decide.

If You Were Automatically Enrolled

Employers that started a new 401(k) plan after December 29, 2022 are generally required to enroll you automatically unless you opt out. The default contribution rate must be between 3% and 10% of pay, with an automatic one-percentage-point increase each year until the rate reaches at least 10% (capped at 15%).12Federal Register. Automatic Enrollment Requirements Under Section 414A Plans that existed before that date, government plans, church plans, businesses less than three years old, and employers with 10 or fewer workers are exempt.

If you were auto-enrolled and want the money back, plans must let you withdraw automatic contributions within 30 to 90 days of the first deduction.13Internal Revenue Service. FAQs: Auto-Enrollment – Can an Employee Withdraw Any Automatic Enrollment Contributions From the Retirement Plan? Income tax applies to pre-tax amounts you pull out, and any employer match tied to those contributions is forfeited. Miss that window and normal early distribution rules take over.

Changing or Stopping Contributions

Most employers now let you adjust your deferral rate through an online benefits portal at any time. Some plans limit changes to specific windows, but federal law generally allows you to stop contributing entirely whenever you want. Changes usually take effect within one or two pay periods, depending on where your employer sits in its payroll cycle.

Save a confirmation screenshot when you submit a change. Payroll errors happen, and a timestamped record is what you’ll want if the wrong amount comes out of the next paycheck.

Getting Money Out Before Retirement

Distributions before age 59½ generally trigger a 10% additional tax on top of regular income tax.14Internal Revenue Service. Retirement Topics – Exceptions to Tax on Early Distributions There are three main routes to the money before then.

Plan loans. If your plan allows them, you can borrow up to the lesser of $50,000 or 50% of your vested balance. Repayment runs through payroll deductions over five years, with interest going back into your own account. Home purchase loans can stretch longer.15eCFR. 26 CFR 1.72(p)-1 – Loans Treated as Distributions The trap is job separation. Most plans won’t accept continued loan payments from a former employee, and if the balance isn’t paid off by the end of the cure period (the quarter after the quarter of default), the outstanding amount becomes a taxable distribution, plus the 10% penalty if you’re under 59½.

Hardship withdrawals. These are available for qualifying needs like unreimbursed medical expenses, purchase of a primary home, tuition, preventing eviction or foreclosure, funeral expenses, and certain disaster losses.16Internal Revenue Service. Retirement Plans FAQs Regarding Hardship Distributions You can only take what’s needed to cover the expense, including taxes and penalty the withdrawal itself generates. Hardship withdrawals cannot be paid back, and the 10% penalty applies unless one of the exceptions listed below fits.

Penalty exceptions. Income tax still applies, but the 10% additional tax does not, in several situations:14Internal Revenue Service. Retirement Topics – Exceptions to Tax on Early Distributions

  • Leaving your job during or after the year you turn 55 (age 50 for public safety employees), for distributions from that employer’s plan.
  • Total and permanent disability, or distributions to beneficiaries after death.
  • Distributions to a former spouse under a qualified domestic relations order.
  • Unreimbursed medical expenses above 7.5% of adjusted gross income.
  • Up to $5,000 per child for qualified birth or adoption expenses.
  • Up to $22,000 for economic losses from a federally declared disaster.
  • Up to the lesser of $10,000 or 50% of your vested balance for domestic abuse victims.
  • Distributions after a physician certifies terminal illness.

SECURE 2.0 added a self-certified emergency withdrawal starting in 2024: one per calendar year, up to $1,000 (or your vested balance minus $1,000, if smaller), for an unforeseeable personal or family emergency. If you don’t repay it within three years, you can’t take another emergency distribution during that period. Withholding on this one runs at 10% rather than the 20% mandatory withholding that normally applies to plan distributions.