How a 401(k) Match Works: Formulas, Vesting and 2026 Limits

A 401(k) match is money your employer adds to your retirement account based on how much you contribute from your own paycheck. The plan document sets the formula. A common example the IRS gives is an employer adding 50 cents for every dollar you defer ^[1]. To get the full match, you usually need to contribute at least the percentage of pay the formula names. For 2026, you can defer up to $24,500 of your own pay, plus catch-up amounts if you are 50 or older, and the match does not count against that $24,500 ^[2][3]. Below are the common formulas with worked examples, how vesting decides when the match is truly yours, the 2026 limits, and what happens when you change jobs.

How the money flows

Each payday, you choose a percentage or dollar amount to send to the plan. These are called elective deferrals. Pre-tax deferrals are generally not subject to federal income tax withholding when you make them, though Social Security and Medicare taxes still apply ^[1]. Many plans also let you choose Roth deferrals, which are taxed now but can come out tax-free later under Roth rules ^[1].

Your employer then adds its matching contribution according to the plan's formula. An employer can make matching contributions, contributions for all eligible employees whether they defer or not, or both ^[1]. A match only goes to people who contribute; the other kind, called a nonelective contribution, goes to every eligible employee ^[4].

Common match formulas, with worked examples

All examples below assume a salary of $60,000 a year.

Partial match: 50% of the first 6% of pay

The employer matches half of what you contribute, up to 6% of your salary.

Going from 3% to 6% doubles the match. Going above 6% adds your own savings, but the match stays at $1,800 because the formula stops at 6%.

Dollar-for-dollar match up to 4% of pay

The employer matches every dollar up to 4% of salary. Contributing 4% ($2,400) earns a $2,400 match. Contributing 2% ($1,200) earns only $1,200, leaving $1,200 a year unclaimed.

Safe harbor basic match

Some employers use a "safe harbor" plan design, which spares the plan from the complex yearly fairness tests that apply to traditional 401(k) plans ^[1]. One safe harbor formula matches 100% of your contributions up to 3% of pay, plus 50% of contributions between 3% and 5% of pay ^[4]. Safe harbor contributions must be fully vested, meaning yours right away ^[1].

• Contribute 5% ($3,000): the match is $1,800 (on the first 3%) + $600 (half of the next 2%) = $2,400, or 4% of pay.
• Contribute 3% ($1,800): the match is $1,800.

Automatic enrollment safe harbor (QACA)

Plans with a qualified automatic contribution arrangement enroll you at a starting rate of at least 3% of pay unless you opt out. The employer must either match 100% of deferrals up to 1% of pay and 50% of deferrals from 1% to 6% of pay, or give everyone a 3% nonelective contribution ^[4].

• Contribute 6% ($3,600): the match is $600 (on the first 1%) + $1,500 (half of the next 5%) = $2,100, or 3.5% of pay.

Nonelective contribution of 3%

Instead of a match, a safe harbor employer may contribute 3% of pay for each eligible employee ^[4]. On $60,000, that is $1,800, even if you contribute nothing.

SIMPLE 401(k)

Small employers with a SIMPLE 401(k) are limited to either a dollar-for-dollar match up to 3% of pay or a 2% nonelective contribution ^[4]. On $60,000, the match tops out at $1,800.

Questions to ask HR about your formula

• What percentage do I need to contribute to get the full match?
• Is the match figured each pay period or once a year? If it is per paycheck and you hit the annual deferral limit early, you could miss match dollars in later months unless the plan makes an end-of-year correction.
• Does the plan count bonuses as pay for the match? The plan's definition of compensation decides this.
• What is the vesting schedule?

There is also a cap on how much pay can count. For 2026, a plan can consider no more than $360,000 of your compensation when it figures contributions ^[3].

Vesting: when the match becomes yours

Vesting means ownership. Your own deferrals are always 100% vested ^[5]. Employer contributions may vest over time, according to the schedule in the plan document ^[5]. If you leave before you are fully vested, the unvested part can be forfeited ^[5].

The IRS shows two common schedule shapes ^[5]:

Plans can be more generous, all the way to immediate vesting ^[5]. A year of service is defined by the plan and is generally 1,000 hours worked over 12 months ^[5]. You become 100% vested when you reach the plan's normal retirement age or if the plan is ended ^[5].

Vesting example. Keisha's employer has put $9,000 of matching money in her account over four years. Her plan uses the 6-year graded schedule. If she leaves now, she is 60% vested: she keeps $5,400 of the match plus all of her own contributions, and $3,600 is forfeited. If she waits until her sixth year of service, she keeps all of it. When a job offer arrives, the unvested amount is a real number to weigh against the new salary.

Your summary plan description and annual benefits statement show your vesting ^[5].

2026 contribution limits

Your limit is personal. The $24,500 covers all elective deferrals you make to all plans in a year. If you work for two employers, your combined deferrals must stay under the limit ^[3]. Your own plan may also set a lower limit, and highly paid employees can be limited further by the plan's fairness testing ^[3].

The employer match is separate. Matching contributions count toward the overall annual additions limit, which is the smaller of 100% of your pay or $72,000 for 2026 ($80,000 including age 50+ catch-up, and up to $83,250 for ages 60 to 63) ^[3]. They do not use up your $24,500.

Example. Ray is 45 and earns $150,000. He defers the full $24,500. His employer matches 100% of the first 5% of pay, which is $7,500. His total for 2026 is $32,000, well under the $72,000 overall limit.

Catch-up rules

• Age 50 or older by December 31. If your plan allows it, you can add up to $8,000 in 2026, for a total of $32,500 ^[2][3]. You do not have to be "behind" on savings to qualify ^[3].
• Ages 60, 61, 62 and 63. A change in the 2022 SECURE 2.0 law raised the catch-up for people who turn 60 through 63 during the year. For 2026, that limit is $11,250 instead of $8,000 ^[6], so the total is $35,750.
• Roth catch-up for higher earners. Starting in 2026, if your prior-year wages from the employer sponsoring the plan were over $150,000, your catch-up contributions must be made as Roth contributions, in plans that have a Roth feature ^[6].

If you contribute too much

If your deferrals across all plans go over the limit, tell your plan administrator before April 15 of the next year and ask for the excess, plus earnings, to be paid out. If the excess stays in the plan, it is taxed twice: once in the year you contributed and again when you take it out ^[3].

What happens to your 401(k) when you leave a job

You generally have four choices for your vested balance ^[7]:

1. Leave it in the old plan, if the plan allows. This can make sense if the plan has good investments and low fees.
2. Roll it into your new employer's plan, if that plan accepts rollovers.
3. Roll it into an IRA. Rolling into a traditional IRA keeps the tax deferral. Rolling pre-tax money into a Roth IRA means the untaxed amount counts as income that year ^[7].
4. Cash it out. You will likely owe income tax on the untaxed money, and you may owe the 10% early distribution tax if you are under 55 ^[7].

The age-55 rule. If you leave your job during or after the year you turn 55, distributions from that employer's plan are exempt from the 10% additional tax. For certain public safety workers, the age is 50 ^[8].

Small balances. A plan may pay out a departing worker's vested balance without consent if it is $7,000 or less. If such a payout is more than $1,000 and you do not choose where it goes, the plan must roll it directly into an IRA for you ^[9].

Direct versus indirect rollover. In a direct rollover, the old plan sends the money straight to the new plan or IRA. If the plan pays you instead, it usually withholds 20% for federal tax, and you have 60 days to deposit the money. To roll over the full amount, you must make up the 20% from other savings. Any part you do not deposit counts as income and may face the early distribution tax ^[7].

Example. Carlos, 38, leaves a job with a $40,000 vested 401(k) and takes a check. The plan withholds 20%, so he receives $32,000. To avoid tax on the full balance, he must deposit $40,000 in an IRA within 60 days, finding the missing $8,000 elsewhere ^[7]. A direct rollover would have avoided the problem.

Common mistakes

• Contributing less than the match requires. In the 50%-of-6% example, contributing 3% instead of 6% leaves $900 a year on the table.
• Leaving just before a vesting date. One more year can change a 60% vested balance into 80% or 100%.
• Cashing out small balances. Taxes and the 10% additional tax can eat a large share of a modest account ^[7].
• Going over the limit with two jobs in one year. Neither employer tracks the other plan; that is your job ^[3].
• Missing catch-up at 50, or the higher catch-up at 60 to 63 ^[2].

When to get professional help

Consider a fee-only financial planner or tax professional if you are deciding whether to roll a large balance into a Roth IRA, if your plan holds your employer's stock, if you are 55 or older and planning withdrawals, or if you have plans at more than one employer. The plan administrator can answer questions about your specific formula and vesting, since rules vary by plan ^[3].

Your next step: log in to your plan account or open your latest benefits statement. Find your current contribution rate, the match formula and your vested percentage. If your rate is below the level that earns the full match, raise it before your next payroll.