What Is a 401(k) Match? How It Works and What Vesting Means

An employer match is extra money for your retirement, but the fine print, especially vesting, decides how much of it you actually keep.

When you start a new job, the benefits paperwork can feel like a stack of homework. Somewhere in there is a line about the 401(k) plan, and maybe a phrase like "company match." It's easy to skim past.

That line deserves a closer look. A match is money your employer adds to your retirement account when you save. Understanding how it works, and when it becomes fully yours, can help you get the most from a benefit you've already earned by showing up to work.

The basics: what a 401(k) is

A 401(k) is a retirement savings plan offered through an employer. You choose to have part of each paycheck go into your account. These paycheck contributions are called elective deferrals.

With a traditional (pre-tax) 401(k), the IRS explains that the amounts you defer aren't counted as taxable income on your federal tax return, though they're still subject to Social Security and Medicare taxes. Some plans also let you choose Roth deferrals, which are made with after-tax money and follow Roth tax rules.

There's a yearly limit on how much you can defer, and it can change. Check the current limit on irs.gov.

What a match is

A match is a contribution your employer makes to your account based on how much you contribute. In other words, your employer "matches" some or all of what you save.

Matching formulas vary by plan. The IRS gives an example of an employer contributing 50 cents for each dollar an employee chooses to defer. Plans often put a cap on it, such as matching only up to a certain percentage of your pay.

Here's how a few sample formulas could look, using a hypothetical salary of $50,000:

• Dollar-for-dollar up to 3% of pay. If you contribute 3% ($1,500), your employer adds $1,500.
• 50 cents per dollar up to 6% of pay. If you contribute 6% ($3,000), your employer adds $1,500.
• Same formula, lower contribution. If you contribute only 2% ($1,000) under the 50-cent formula, your employer adds $500.

These are just illustrations. Your plan's own formula is what counts.

One more thing: matches are tied to what you contribute. If you don't contribute, there's usually nothing to match. That's why many people aim to contribute at least enough to receive the full match, if their budget allows.

Vesting: when the match is truly yours

This is the part many people miss.

The IRS describes vesting simply: it means ownership. If you're 100% vested in your account, you own 100% of it. If you're partly vested, you own only part of the employer money.

Two important rules:

• Your own contributions are always yours. The IRS says an employee's own contributions, such as elective deferrals taken from salary, are always 100% vested. If you leave the job tomorrow, the money you put in comes with you.
• Employer contributions may follow a schedule. Your employer's match may vest over time. Until it's fully vested, leaving your job could mean giving some of it up.

Common vesting schedules

The IRS describes two main types:

Cliff vesting. You own none of the employer match until you reach a set number of years of service, then you own all of it at once. For matching contributions, the IRS says the longest cliff schedule allowed means you must be 100% vested once you complete three years of service.

Graded vesting. You own a growing share each year. Under the slowest graded schedule allowed for matching contributions, you'd be 20% vested after two years of service, 40% after three, 60% after four, 80% after five and 100% after six.

Plans are allowed to vest faster than this. Some vest the match immediately.

When vesting is automatic

A few situations mean full vesting no matter the schedule:

• Safe harbor and SIMPLE 401(k) plans. The IRS says these plans must provide employer contributions that are fully vested when made. A safe harbor plan is a type of 401(k) that meets certain contribution rules so the employer can skip some annual testing. One exception: in a safe harbor plan with automatic enrollment, called a QACA, the match can require up to two years of service before it is fully vested.
• Normal retirement age. The IRS says employees must be fully vested when they reach the plan's normal retirement age.
• Plan termination. Employees must also be fully vested if the employer ends the plan.

What happens to unvested money

If you leave before you're fully vested, the unvested portion of the employer match may be forfeited, meaning you lose it. Your own contributions and any vested employer money stay yours.

Why vesting matters for career decisions

Vesting doesn't mean you should stay in a job that isn't right for you. But it's one piece of information worth knowing when you're weighing a move.

A few questions to consider:

• How close are you to your next vesting milestone? If a cliff is a few weeks away, the timing of a job change could make a real difference.
• What does the new employer offer? Compare the new plan's match and vesting schedule, not just salary.
• How much unvested money is at stake? Your account statement or online plan portal may show your vested balance.

How to find your plan's details

Every plan is different, so go to the source:

1. Read your summary plan description (SPD). The U.S. Department of Labor says this document tells you what your plan provides and how it operates. It's a good place to look for the match formula and vesting schedule.
2. Log in to your plan account. Look for your vested balance and contribution settings.
3. Ask HR or the plan administrator. Questions like "How is the match calculated?" and "What's the vesting schedule?" are routine.
4. Check your contribution rate. Make sure it's set high enough to receive the match you're eligible for, if that fits your budget.
5. Revisit after raises. If your contribution is a percentage of pay, it will rise with your salary, but it's still worth confirming you're on track.

This article is for education only and is not financial advice. Everyone's situation is different.