How 401(k) Employer Matching Works
An employer match is the closest thing to free money in personal finance. Here's how matches are structured, what vesting means, and why you should never leave one on the table.
Last updated: 2026-07-21
Many employers offer to match part of what you contribute to your 401(k). It is an instant, guaranteed return on your savings — often 50% or 100% — that no investment can reliably beat. Understanding how your specific match works is one of the highest-value things you can do for your retirement.
How a match is usually written
A typical formula reads something like fifty cents on the dollar up to 6% of your salary. That means if you contribute 6% of your pay, your employer adds another 3%. Contribute less than 6% and you get less than the full match; contribute more, and the extra is all yours but no longer matched.
- Full match — the employer matches 100% of what you put in, up to a cap.
- Partial match — the employer matches a fraction, such as 50%, up to a cap.
- The cap is almost always expressed as a percentage of your salary, not a dollar amount.
Vesting: when the match is truly yours
Your own contributions are always 100% yours. The employer match, however, may vest over time — you might need to stay a few years before you own all of it. With cliff vesting you own nothing until a set date and then everything at once; with graded vesting you own a growing percentage each year. Leaving before you are fully vested means forfeiting the unvested portion.
The one rule to remember
At a minimum, contribute enough to capture the entire match. Passing it up is turning down a guaranteed raise. Once you are getting the full match, you can decide whether to keep going in the 401(k) or route additional savings to an IRA.
See how much the match adds over a career with the calculators below.