If you open your 401(k) statement and see money you don’t remember putting there, you are probably looking at your employer’s contributions. You are rarely the only one funding the account. Most plans mix money from your own paycheck with money from the company, and that company money can arrive as a match, as a profit-sharing contribution, or as both.
The reason this matters is that each source follows its own tax rules, answers to its own IRS limit, and has its own vesting treatment, which is the schedule that decides when employer money truly becomes yours. Below is each source in plain terms, with a link to the full guide for each one.
What are the five types of 401(k) contributions?
1. Pre-tax employee deferrals
This is the classic 401(k) contribution, the money taken out of your paycheck at your election before income tax is withheld. Because the contribution comes out first, it lowers your taxable income for the year, and the money then grows tax-deferred until you withdraw it. At withdrawal, it is taxed as ordinary income.
Pre-tax and Roth deferrals together are capped at $24,500 for 2026 under IRC §402(g). On top of that, you can add an $8,000 catch-up contribution at age 50 or older, or $11,250 at ages 60–63, per IRS Notice 2025-67. The full guide is here, on employee deferral contributions.
2. Roth employee deferrals
A Roth deferral is the same paycheck election, just taxed now instead of later. You get no up-front deduction, so your take-home pay drops more than it would with a pre-tax contribution of the same size. In exchange, qualified withdrawals in retirement come out completely tax-free, both the contributions and everything they earned.
Roth deferrals share the single $24,500 limit with pre-tax deferrals rather than getting a limit of their own. You can split your paycheck between the two in any mix you like under IRC §402A. The full guide is the Roth 401(k).
3. Employer matching contributions
A match is money your employer adds because you contributed. A common formula is 50 cents per dollar on the first 6% of pay you defer, which means your own contribution is what unlocks the company’s money. If you contribute nothing, you get nothing.
A match is the highest-return dollar in personal finance, so it is worth contributing enough to capture all of it before you fund anything else. Matching contributions do not count against your $24,500 deferral limit, but they do count toward the $72,000 combined 415(c) cap, and they may vest over a schedule rather than being yours right away. The full guide explains how the employer match works.
4. Employer profit-sharing (nonelective) contributions
A profit-sharing contribution is money your employer puts in for every eligible employee, whether or not you defer anything yourself. That is why the technical name is “nonelective.” Nothing you elect to do triggers it.
These contributions are usually discretionary. If the company had a good year it may share some of that with employees, and in a lean year it can contribute nothing at all. Despite the name, no actual profits are legally required for a company to make one. The full guide covers profit-sharing contributions.
5. After-tax (non-Roth) contributions
After-tax contributions are a separate source that some plans offer above the $24,500 deferral limit, running up to the $72,000 combined cap. The money goes in after tax has been withheld, and then the earnings grow tax-deferred rather than tax-free. That single difference is why after-tax is not the same thing as Roth, even though both go in with taxed dollars.
Their main modern use is the mega backdoor Roth conversion, where you move the after-tax money into a Roth account so the future growth becomes tax-free. The full guide covers after-tax 401(k) contributions.
And a sixth: rollover contributions
Rollover money is money moved in from a former employer’s plan or from an IRA. Rollovers are not annual contributions, so no yearly limit applies to them at all. You can roll in any amount your plan is willing to accept. The full guide covers rollover contributions.
Which limit applies to which contribution type?
Two limits do almost all the work here, and people routinely mix them up. The 402(g) limit caps only the money you defer out of your own paycheck. The 415(c) limit caps everything that lands in your account for the year, from every source combined.
| Contribution type | Counts toward 402(g): $24,500 (2026) | Counts toward 415(c): $72,000 (2026) |
|---|---|---|
| Pre-tax deferral | Yes | Yes |
| Roth deferral | Yes (shared limit) | Yes |
| Employer match | No | Yes |
| Profit sharing / nonelective | No | Yes |
| After-tax (non-Roth) | No | Yes |
| Catch-up (age 50+) | No (sits on top) | No (sits on top) |
| Rollover | No | No |
Two more limits run quietly in the background. Only the first $360,000 of your 2026 compensation can be counted in any contribution formula under §401(a)(17), which mostly affects high earners whose match stops growing partway through the year. Separately, highly compensated employees can be restricted further by nondiscrimination testing. The full set of numbers lives in 401(k) contribution limits for 2026.
Ownership and vesting
Everything you contribute yourself is 100% yours the moment it hits the account, by law. That covers pre-tax deferrals, Roth deferrals, after-tax contributions, and any rollover money you brought in.
Employer money can work differently. Matching and profit-sharing contributions may vest over as long as three years on a cliff schedule, or two to six years on a graded schedule, which means leaving early can forfeit the part you haven’t earned yet. If you are thinking about a job change, this is worth checking before you give notice. Our guide explains how 401(k) vesting works, including how to read your own schedule.
Not every plan offers every type
Most people cannot reach all five sources, and that is normal rather than a sign something is wrong. Your plan document decides which contribution types exist in your plan, and employers make different choices.
Every 401(k) allows pre-tax deferrals. Roth deferrals, matching, profit sharing, and especially after-tax contributions are all optional features that an employer can include or leave out. Your summary plan description, the plain-language booklet your plan has to give you, lists exactly which sources your plan offers. When the booklet and a customer service answer disagree, the plan document controls, so ask your administrator to point you to the language.
A practical funding order
There is a widely used sequence here, and it holds up well. Defer enough to capture the full employer match first, because that is an immediate return on your money that nothing else can match. Then decide how to split between pre-tax and Roth based on your tax bracket now compared with the bracket you expect in retirement. Only after you have maxed the $24,500 deferral limit do after-tax contributions come into play, and only if your plan offers them.
Which contribution types should I use?
- If your employer matches and you are not capturing all of it → Raise your deferral to the full match percentage before you do anything else. This is the one move almost every reader should make.
- If you are early in your career or in a low tax bracket now → Lean toward Roth deferrals, because you are paying tax at a rate you are unlikely to see again.
- If you are in a high bracket and expect a lower one in retirement → Lean toward pre-tax deferrals and take the deduction while it is worth the most.
- If you genuinely can’t predict your future bracket → Split your deferrals between pre-tax and Roth. You are hedging, not guessing, and both share the same $24,500 limit.
- If you are already deferring the full $24,500 and still have money to save → Ask whether your plan allows after-tax contributions and in-plan Roth conversions. If it allows both, you have room up to the $72,000 total.
- If you are 50 or older → Add the catch-up on top, which is $8,000 at 50 and above, or $11,250 during the ages 60–63 window.
- If money is tight this year → Contribute whatever you can sustain, even 2% or 3%. A small deferral you keep beats an ambitious one you cancel.
If your budget allows only one move this year, make it the match. A 50% match is an immediate 50% return that no fund selection or market timing can replicate. And under most plans you can raise your election at any time during the year, so starting small costs you nothing but the time it takes to log back in.
The contribution hierarchy, in order
- 1. Defer enough to capture the full employer match. Free money comes first.
- 2. Pay down high-interest debt, because no investment reliably beats a 20% credit card rate.
- 3. Go back and fill the rest of the $24,500 deferral limit, choosing pre-tax or Roth based on your bracket.
- 4. Add the catch-up if you are 50 or older, which is $8,000, or $11,250 at ages 60–63.
- 5. Only then consider after-tax contributions toward the $72,000 total, and only if your plan offers them.
Frequently asked questions
What is the maximum total 401(k) contribution for 2026?
The maximum is $72,000 from all sources combined under IRC §415(c), counting your deferrals, your employer’s contributions, and any after-tax contributions. Catch-up contributions sit on top of that figure, adding up to $8,000 at age 50 and above, or $11,250 at ages 60–63 (IRS Notice 2025-67).
Do employer contributions count toward my $24,500 limit?
No, they don’t. The $24,500 402(g) limit for 2026 covers only your own pre-tax and Roth salary deferrals. Employer matching and profit-sharing money counts only against the separate $72,000 415(c) limit, so a generous match never crowds out your own contributions.
What is the difference between a match and a profit-sharing contribution?
A match is conditional, meaning the employer contributes only if you do, and in proportion to your deferrals. A profit-sharing (nonelective) contribution goes to every eligible employee whether or not they defer a dollar, usually at the employer’s discretion each year.
Can I make both Roth and pre-tax contributions in the same year?
Yes, as long as your plan offers a Roth option. You can split your deferrals in any proportion you want. Just remember that the two share one $24,500 limit for 2026 rather than getting a limit each.
Are after-tax contributions the same as Roth contributions?
No, and the difference costs real money. Roth deferrals count toward the $24,500 limit and grow tax-free once qualified. After-tax (non-Roth) contributions are a separate source above that limit whose earnings grow only tax-deferred, so you pay tax on those earnings at withdrawal unless you convert them to Roth.
Do rollovers count against any contribution limit?
No. A rollover simply moves existing retirement money between accounts, so it is not a new annual contribution. Neither the 402(g) limit nor the 415(c) limit applies to it.
Related reading
- All 401(k) contribution limits for 2026
- How the 401(k) employer match works
- After-tax contributions and the mega backdoor Roth
Sources: IRS Notice 2025-67 (2026 limits) · IRS: 401(k) and profit-sharing plan contribution limits · IRC §402(g) · IRC §415(c)