401(k) Employer Match Explained: How Not to Leave Free Money Behind
What "50% up to 6%" really means, how vesting works, and why the match is the best guaranteed return available to most workers.
An employer 401(k) match is one of the most valuable benefits most workers have, yet surveys consistently find that a large share of employees do not contribute enough to receive all of it. Here is how matching works and how to make sure you get every dollar.
How a match formula works
Employers describe matches as a percentage of what you contribute, up to a limit expressed as a percentage of your salary.
- "50% up to 6%": the employer adds 50 cents for every dollar you contribute, on contributions up to 6% of salary. Contribute 6% and you receive an extra 3% of salary.
- "100% up to 4%": dollar-for-dollar on the first 4% of salary. Contribute 4%, receive 4%.
- Tiered: for example 100% on the first 3% and 50% on the next 2%, a common "safe harbor" formula worth 4% of salary.
An example in dollars
Earning $70,000 with a 50% match up to 6%:
| You contribute | You put in | Employer adds |
|---|---|---|
| 2% | $1,400 | $700 |
| 4% | $2,800 | $1,400 |
| 6% | $4,200 | $2,100 |
| 10% | $7,000 | $2,100 |
Stopping at 2% leaves $1,400 a year on the table. Over a 35-year career, with 7% investment growth, that gap alone grows to roughly $190,000, and more if your salary rises.
An instant 50–100% return
No investment reliably returns 50% in a year. A match does, the moment the money hits your account. That is why nearly every financial planner says to capture the full match before paying extra on low-interest debt, and usually even before building a large emergency fund beyond a starter amount.
Vesting: when the match is really yours
Your own contributions are always 100% yours. Employer contributions may be subject to a vesting schedule:
- Immediate vesting: yours as soon as it is deposited.
- Cliff vesting: 0% until a set date (up to three years), then 100%.
- Graded vesting: a portion each year, reaching 100% after up to six years.
If you are thinking about changing jobs, check your vesting date first. Leaving a few weeks early can cost thousands.
Traps to avoid
- Front-loading: if you hit the IRS contribution limit early in the year, some plans stop matching for the rest of the year. Ask whether your plan has a "true-up".
- High fees: pick low-cost index or target-date funds inside the plan.
- Cashing out when you leave: roll the balance into your new plan or an IRA instead to avoid taxes and penalties.
Use the 401(k) calculator to see how your contribution rate and match add up by retirement, and try raising your contribution by a percent or two to see the difference.