What Is a 401(k)? How It Works, Employer Match & 2026

A 401(k) is an employer-sponsored retirement account that lets you contribute a portion of your paycheck before it hits your bank account, often with your employer adding money of their own on top. It's named after the section of the tax code that created it, and for most workers with access to one, it's the single largest tax-advantaged way to save for retirement available to them.

How Contributions Work

Money goes into a 401(k) through elective deferrals — a percentage or fixed dollar amount of each paycheck that you choose to redirect into the account instead of receiving as regular pay. Depending on your plan, you may be able to designate these as:

Traditional (pre-tax) contributions, which reduce your taxable income now — you don't pay income tax on that money in the year you earn it, but you will pay ordinary income tax on withdrawals in retirement.

Roth contributions, which don't reduce your taxable income now — you pay tax on the money before it goes in, but qualified withdrawals in retirement, including all the growth, come out tax-free.

Many plans let you split contributions between both types. Whichever you choose, the money is invested according to options your specific plan offers, commonly a menu of mutual funds or target-date funds, and it grows tax-advantaged until you eventually withdraw it.

2026 Contribution Limits

The IRS sets annual limits on how much you can contribute, and these are adjusted for inflation most years. For 2026, per the IRS:

Standard employee elective deferral limit: $24,500 (up from $23,500 in 2025)

Catch-up contribution (age 50 or older, anytime during the year): an additional $8,000, bringing the total to $32,500

"Super" catch-up contribution (specifically for those turning 60, 61, 62, or 63 during 2026, under a SECURE 2.0 Act provision): an additional $11,250 instead of the standard catch-up, bringing the total to $35,750

Combined employee + employer contribution limit under section 415(c): $72,000 for 2026

That last figure matters because it's not just about what you personally contribute — it includes any employer match or other employer contributions, which can push the combined total well above your individual $24,500 deferral limit.

One SECURE 2.0 provision that takes full effect in 2026: if you're 50 or older and earned more than $150,000 in FICA wages from your plan's sponsoring employer in the prior year, your catch-up contributions must be made as Roth contributions, not pre-tax — a mandatory shift worth knowing about if it applies to you.

Employer Matching: The Part That's Easy to Leave on the Table

Many employers match a portion of what you contribute, up to a certain percentage of your salary — a common structure is something like "50% of your contributions, up to 6% of your salary."

Here's what that looks like on a $70,000 salary:

Contributing 6% of salary ($4,200) with a 50% match up to 6%:

Employee contributes: $4,200 Employer match: $2,100 Total going into the account: $6,300

Contributing only 3% of salary ($2,100) instead:

Employee contributes: $2,100 Employer match: $1,050 Total going into the account: $3,150

By contributing 3% instead of the full 6% needed to capture the maximum match, that employee leaves $1,050 in free employer money on the table every single year. Left uninvested for 30 years at a hypothetical 7% average annual return, that gap alone — just the missed match, not even the employee's own missed contributions — represents roughly $99,000 in lost retirement account growth.

This is why contributing at least enough to capture your full employer match is one of the most commonly repeated pieces of retirement advice: it's money your employer has already agreed to give you, contingent only on you contributing enough yourself to claim it.

Vesting: Why the Match Isn't Always Fully Yours Immediately

Your own contributions are always 100% immediately vested — nobody can take back the money you personally put in. Employer matching contributions, however, can follow a vesting schedule set by the plan, meaning you may need to stay employed for a certain period before that matched money is fully and permanently yours.

Common structures include gradual (graded) vesting over several years or "cliff" vesting, where you go from 0% to 100% vested at a single point. If you leave a job before you're fully vested, you can generally keep your own contributions and their growth, but you may forfeit some or all of the unvested employer match.

When You Can Access the Money

401(k) funds are generally intended to stay invested until retirement, and early access is restricted. Distributions are generally only permitted upon specific triggering events: separation from your employer, reaching age 59½, death, disability, plan termination, or in certain hardship situations.

A hardship distribution, when permitted, is limited to the amount actually needed to address the hardship and is generally subject to ordinary income tax, plus, in most cases, an additional 10% early withdrawal penalty if taken before age 59½.

Required Minimum Distributions (RMDs) — mandatory withdrawals the IRS requires you to start taking — currently begin at age 73 for most traditional 401(k) participants under SECURE 2.0 rules. Designated Roth 401(k) accounts were also updated by SECURE 2.0 to eliminate lifetime RMDs, aligning their treatment more closely with Roth IRAs.

401(k) vs. an IRA

A 401(k) is employer-sponsored — you need access through your job, and your specific employer's plan determines your investment menu and any match. An IRA (Individual Retirement Account) is opened independently through a brokerage, with no employer involvement and generally a wider range of investment choices, but IRAs carry their own, typically lower, annual contribution limits and don't come with an employer match. Many people use both: contributing enough to a 401(k) to capture the full employer match, then directing additional retirement savings to an IRA.

Frequently Asked Questions

Does the employer match count toward my $24,500 limit?

No. The $24,500 figure is specifically your own elective deferral limit. Employer contributions, including matches, are separate and count toward the higher combined limit ($72,000 for 2026 for most participants).

What happens if I contribute more than the annual limit?

Any excess is included in your taxable income, and it needs to be corrected — typically by withdrawing the excess amount — to avoid additional tax consequences. Most payroll systems are set up to stop contributions automatically once you hit the limit.

Can I lose money in a 401(k)?

Yes. The money is invested, typically in mutual funds or similar vehicles you select from your plan's menu, and the account's value moves with the performance of those underlying investments — there's no guarantee against loss, though the tax advantages remain regardless of investment performance.

Is a Roth or traditional 401(k) better?

It depends largely on whether you expect to be in a higher or lower tax bracket now versus in retirement, since that determines which side of the tax break — now or later — is more valuable to you. Many plans allow contributing to both to hedge against that uncertainty.

What happens to my 401(k) if I switch jobs?

Common options include leaving it with your former employer's plan (if allowed), rolling it into your new employer's 401(k), rolling it into an IRA, or in some cases cashing it out (which generally triggers taxes and, if you're under 59½, a penalty). A rollover done correctly generally avoids triggering taxes or penalties.

Key Takeaways

A 401(k) lets you contribute pre-tax or Roth dollars directly from your paycheck into a retirement account, often paired with an employer match that amounts to free money contingent on your own contribution level. For 2026, the standard employee deferral limit is $24,500, with catch-up provisions pushing that higher for those 50 and older — up to $35,750 for those turning 60–63 this year under SECURE 2.0's enhanced catch-up.

The single most common mistake isn't picking the wrong fund — it's contributing below whatever threshold captures the full employer match, which leaves guaranteed, immediate free money unclaimed every pay period it happens.

Sources

This article is for general educational purposes only and does not constitute financial, investment, tax, or legal advice.

Last updated: August 2026