A 401(k) is an employer-sponsored retirement savings account that lets employees contribute part of each paycheck, either before or after income tax, and invest it for retirement. Many employers add matching contributions, and the IRS sets yearly limits on how much can go in. Tax treatment depends on whether contributions are traditional or Roth.
If a first job just handed you a benefits packet, the 401(k) section can look like a wall of jargon. This guide takes it one piece at a time: what the account is, which 2026 limits apply, how an employer match turns into dollars, when that match becomes yours, and what happens to the account if you change jobs.
Key Takeaways
- A 401(k) is a workplace retirement account funded by payroll deductions, with either traditional (pre-tax) or Roth (after-tax) contributions, depending on what the plan offers.
- For 2026, the IRS sets the employee contribution limit at $24,500, with higher catch-up amounts for ages 50 and over, and a separate $72,000 overall limit that includes employer money.
- An employer match is a formula, such as 50% of contributions up to 6% of pay. Under that formula, contributions below 6% leave part of the match unclaimed.
- Vesting decides when employer contributions belong to you. Your own contributions are always fully yours to keep, although the value of the account rises and falls with its investments.
- When you leave a job, a direct rollover avoids the 20% mandatory withholding that applies when a plan pays the money to you.
What Is a 401(k)?
The name comes from section 401(k) of the Internal Revenue Code, the part of US tax law that created this type of plan. In everyday terms, it is a savings account set up through your employer, with its own tax rules and its own limits.
Money gets into the account through payroll. You choose a percentage of each paycheck, and your employer sends that amount to the plan before the money reaches your bank account. The IRS calls these payroll contributions elective deferrals, because you elect to defer part of your pay into the plan instead of receiving it as cash.
Once the money is in the plan, you pick from the investment options the plan offers, and the balance can grow or fall with those investments over time.
On a pay stub, this appears as a deduction line, usually labeled with the plan or the word "401(k)". If your gross pay for a period is $2,000 and you contribute 5%, the plan receives $100 from that paycheck.
Contributions continue until you change the percentage, stop contributing or reach the yearly limit described in the next section. Because the money moves automatically each pay period, no separate monthly transfer is needed. The account and its investments still carry risk, like any other investment account.
Some plans enroll eligible employees automatically. Many newer 401(k) plans must automatically enroll eligible employees at a starting rate of 3% to 10% of pay, though some employers are exempt and you can usually change or opt out.
Traditional vs. Roth 401(k)
Plans commonly offer one or both of two tax treatments. Here are the two terms in plain words.
- Traditional (pre-tax) contributions reduce your taxable pay now. You pay income tax when you withdraw the money later.
- Roth contributions go in after tax. If a withdrawal meets the plan and IRS conditions for a qualified distribution, the earnings come out tax-free too.
Individual situations differ, and the right tax treatment depends on facts that are specific to each person. The Roth idea works much like the one in this Roth IRA explainer, except that a Roth 401(k) lives inside an employer plan and follows that plan's rules.
Employer matching contributions have traditionally gone in pre-tax. Since 2023, the SECURE 2.0 Act, a federal retirement-savings law, lets a plan offer matching contributions on a Roth basis if the plan chooses to, so the plan's own rules decide how the match is treated.
Where the 401(k) fits among other accounts
A 401(k) is only one kind of retirement account. IRAs, Roth IRAs and health savings accounts each have their own rules and limits. If you want a side-by-side view of how these accounts compare, the retirement accounts guide covers them together. This article stays with the 401(k) and its employer match.
2026 401(k) Contribution Limits
The IRS adjusts retirement limits most years. For 2026, the IRS sets the limit on employee 401(k) contributions at $24,500, up from $23,500 in 2025. That is the most you can defer from your own pay in one year. A few other numbers sit alongside it, and beginners often mix them up, so the table puts them in one place.
| Type of limit | 2026 amount | What it covers |
|---|---|---|
| Employee elective deferral | $24,500 | Your own contributions from pay |
| Catch-up, age 50 and over | $8,000 | Added to the deferral limit, for a combined employee limit of $32,500 |
| Catch-up, ages 60 to 63 | $11,250 | Replaces the $8,000 catch-up, for a combined employee limit of $35,750 |
| Total annual additions (employee + employer) | $72,000 | Lesser of 100% of pay or $72,000, excluding catch-up (section 415(c)) |
Catch-up contributions
A catch-up contribution is an extra amount that older employees may contribute on top of the regular limit. Employees aged 50 and over can add a catch-up contribution of $8,000 in 2026, which brings the combined employee limit to $32,500. Employees aged 60 to 63 can make a higher catch-up contribution of $11,250 in 2026, instead of $8,000, for a combined limit of $35,750.
One more rule applies only to higher earners aged 50 and over. If their wages from the employer in the prior year were above $150,000 (the 2026 threshold), their catch-up contributions generally have to be Roth contributions, with final IRS rules taking full effect for years after 2026. Plan rules vary.
Employee plus employer: the total additions limit
A separate overall limit applies to everything added to your account in a year. For 2026, employee plus employer contributions cannot exceed the lesser of 100% of your pay or $72,000, not counting catch-up contributions.
This is where the match fits in. Employer matching money does not count toward the $24,500 employee limit, because it is not your own deferral. It does count toward the $72,000 total.
At a $60,000 salary, a 10% contribution is $6,000, far below the $24,500 employee limit. Add a $1,800 employer match, and the $7,800 total sits far below the $72,000 overall limit.
How Does the 401(k) Employer Match Work?
An employer match is money your employer adds to your 401(k) based on how much you contribute from your own pay. The employer sets a formula, and the plan document spells it out. The match is not a salary increase you receive in cash. It goes into your 401(k) account, and it comes with its own ownership rules, which the vesting section below explains.
Two ideas drive every match formula. The first is the match rate, which is the share of your contribution the employer adds. The second is the matching cap, which is the point where the employer stops matching, usually stated as a percentage of your pay.
Common formula shapes
The formulas below are illustrations of how plans can be built. They are not typical or average terms, and each employer chooses its own.
- 50% of contributions up to 6% of pay. The employer adds 50 cents for each dollar you contribute, until your contribution reaches 6% of pay.
- Dollar-for-dollar up to 4% of pay. The employer matches 100% of your contribution, until it reaches 4% of pay.
Where the match stops
Take the second formula with a $60,000 salary. The maximum match is 4% of $60,000, which is $2,400.
Suppose an employee contributes 3% of pay, which is $1,800. The employer matches that $1,800 dollar for dollar. The employee then has $600 of potential match that went unclaimed, because the contribution stopped one percentage point short of the cap.
The first formula works the same way with different numbers. The maximum match is 50% of 6% of $60,000, which equals $1,800. The next section runs that formula across five contribution levels.
A plain-terms recap before moving on: the match rate is how much the employer adds per dollar, the cap is where the adding stops, and "unclaimed" means match money the formula would have paid at a higher contribution but did not, because the contribution was lower. Plans differ, so the plan's own documents decide what applies to a given employee.
Those documents usually include a summary plan description, a plain-language overview of the plan, and enrollment materials. The match formula is normally listed under employer contributions, the vesting schedule under vesting or years of service, and fund fees in the plan's fee disclosure.
What the Match Is Worth: A Worked Example
The table below is a hypothetical example. It assumes a $60,000 salary and one illustrative formula: the employer matches 50% of contributions up to 6% of pay. Each row changes only one thing, the share of pay the employee contributes.
| Contribution rate | You contribute | Employer match | Total per year | Match unclaimed |
|---|---|---|---|---|
| 2% of pay | $1,200 | $600 | $1,800 | $1,200 |
| 4% of pay | $2,400 | $1,200 | $3,600 | $600 |
| 6% of pay | $3,600 | $1,800 | $5,400 | $0 |
| 8% of pay | $4,800 | $1,800 | $6,600 | $0 |
| 10% of pay | $6,000 | $1,800 | $7,800 | $0 |
Reading the table row by row
At a 2% contribution, the employee puts in $1,200, and the employer adds half of that, $600. The maximum match under this formula is $1,800, so $1,200 stays unclaimed. The 4% row follows the same pattern, with the unclaimed amount shrinking as the contribution rises.
At 6%, the contribution reaches the cap. The employee contributes $3,600, the match is $1,800, and nothing is left unclaimed. The total going into the account that year is $5,400.
Why contributions above the cap do not add match
At 8% and 10%, the match stays at $1,800. The employee contributes more ($4,800 and $6,000), and the total rises to $6,600 and $7,800. The extra contributions still count as the employee's own savings. The employer's share stops growing because the formula stops matching at 6% of pay.
Under this formula, then, contributions below 6% leave part of the match unclaimed, and contributions above 6% do not increase it. A different formula would produce a different table, because each plan's own match rate, cap and salary change the arithmetic.
The table ignores investment growth and taxes. It shows only what goes into the account each year, nothing about what the balance may be worth later.
401(k) Vesting: When the Match Becomes Yours
Vesting is the rule that decides when employer contributions to your account belong to you. Until you are vested in a contribution, you may lose it if you leave the employer.
The money you contribute from your own pay is always 100% yours to keep, no matter how long you have worked there. Ownership is not a guarantee of value: the account's balance can still fall with its investments. Vesting rules apply only to employer contributions.
The IRS sets the slowest schedules a plan may use for employer contributions. A plan can vest faster than these limits, up to immediate vesting, so the plan's own schedule is the one that applies. Both schedules below count years of service, which are the years you have worked for the employer under the plan's rules.
Cliff vesting
Cliff vesting means 0% until you complete three years of service, then 100%. If you leave after two years and eleven months, you keep none of the employer match. If you leave at three years, you keep all of it.
Graded vesting
Graded vesting means a rising share each year, reaching 100% after six years. The maximum schedule is 20% after two years of service, then 20% more each year. That puts the share at 40% after three years, 60% after four, 80% after five and 100% after six.
What you keep if you leave before you are fully vested
The next table uses the match from the earlier example: $1,800 per year, with no investment growth. It compares what an employee keeps under each maximum schedule after leaving.
| Years of service | Match accumulated | Graded kept | Cliff kept |
|---|---|---|---|
| 2 years | $3,600 | $720 (20%) | $0 (0%) |
| 3 years | $5,400 | $2,160 (40%) | $5,400 (100%) |
After two years, the employee has $3,600 of match in the account. Under the graded schedule, 20% is vested, so $720 is kept and $2,880 is forfeited. Under the cliff schedule, nothing is vested yet, so $0 is kept and the full $3,600 is forfeited.
After three years, the picture flips. The employee has $5,400 of match. Under the graded schedule, 40% is vested, so $2,160 is kept and $3,240 is forfeited. Under the cliff schedule, the employee reaches 100%, so all $5,400 is kept.
Neither schedule is better in every case. The result depends on how long someone stays, so the amount of match that is actually kept depends on both the match formula and the vesting schedule together.
What Happens to Your 401(k) When You Change Jobs
A 401(k) belongs to you, not to your former employer, up to the vested amount. When you leave, you generally have four options. Check what your plan allows, because details vary.
- Leave the money in the old plan. Many plans allow this once the balance is above a minimum, and the account keeps its investments.
- Roll it into your new employer's plan. A rollover is a transfer of retirement money from one account to another without paying tax on the move. The new plan has to accept rollovers.
- Roll it into an IRA. An IRA is an individual retirement account that you open yourself, outside any employer.
- Cash it out. The plan pays you the money, and it is taxed as described below.
If your vested balance is small when you leave, some plans may cash it out or move it to an IRA without your consent. The SECURE 2.0 Act allows plans to set that threshold as high as $7,000, so check your plan's rules.
Direct rollover vs. a check to you
How the money moves matters. If the plan pays the money to you, it must withhold 20% for federal tax, even if you plan to roll it over. A direct rollover, where the plan sends the money straight to a new plan or IRA, avoids that withholding. You generally have 60 days from receiving a distribution to roll it over.
Early-withdrawal rules at a general level
Cashing out is a withdrawal, and withdrawals follow tax rules. Withdrawals before age 59 1/2 usually trigger an additional 10% tax on top of regular income tax, unless an exception applies. The IRS lists exceptions such as disability and death.
One exception covers employees who leave their job during or after the year they turn 55. It applies to that employer's plan, not to an IRA, and the plan has to allow the withdrawal.
Most people who reach age 73 also have to start taking required minimum distributions, which are yearly withdrawals the IRS requires, from traditional 401(k) accounts. The starting age depends on your birth year, so check the IRS tables. These are general descriptions, and a tax professional can speak to an individual situation.
401(k) Fees and Investment Options
Plans come with costs, and they are worth understanding. An expense ratio is the yearly fee a fund charges, shown as a percentage of the money invested in it. A fund with a 0.50% expense ratio, for example, charges $5 per year for every $1,000 invested. Plans can also charge administrative fees, which the plan documents describe.
Most plans offer a menu of investment options, often a mix of stock funds, bond funds and target-date funds. A target-date fund is a fund built around an expected retirement year, which adjusts its mix of investments as that year approaches. The menu, the fees and the way the plan labels each option vary by employer, so the plan's fee disclosure is the document to read. Past performance does not guarantee future results, and any investment can lose value.
Frequently Asked Questions About the 401(k)
What does 401(k) stand for?
The name does not stand for words. It refers to section 401(k) of the Internal Revenue Code, the part of US tax law that created this kind of employer retirement plan. People use "401(k)" as shorthand for the plan, the account and the tax rules that go with it.
Does the employer match count toward the 401(k) contribution limit?
The match counts toward the overall limit but not the employee limit. For 2026, the employee limit is $24,500, covering only your own deferrals. Employee plus employer contributions together cannot exceed the lesser of 100% of pay or $72,000, not counting catch-up contributions.
Do I have to contribute to get the employer match?
Under a matching formula, yes. A match is calculated from your own contributions, so with no contribution there is nothing to match under that formula. Some employers also make contributions that do not depend on what employees put in, which is a different feature, so the plan documents are the place to check.
Is a 401(k) taken out before taxes?
It depends on the type of contribution. Traditional contributions reduce taxable pay now and are taxed when withdrawn. Roth contributions go in after tax, and qualified withdrawals can come out tax-free. A plan may offer one or both, and individual tax situations differ.
Do I lose my employer match if I leave before I am vested?
Only the unvested part of the employer match is forfeited. Your own contributions are always 100% vested, and any vested portion of the match stays yours. How much is vested depends on the plan's schedule, which can be no slower than the IRS maximums of a three-year cliff or six-year graded schedule.
Can I withdraw from my 401(k) before 59 1/2?
Plans decide when withdrawals are allowed, and the tax rules add a cost. Withdrawals before age 59 1/2 usually trigger an additional 10% tax on top of regular income tax, unless an exception applies. The IRS lists exceptions such as disability and death, plus separation from service at 55 or later for that employer's plan.