If your employer matches 401(k) contributions and you're not contributing enough to capture the full match, you are turning down a guaranteed raise. No investment you can buy reliably returns 50% or 100% instantly — but that's exactly what a match does. Understanding the formula, and contributing at least enough to max it, is the single highest-return move available to most workers.
How match formulas work
An employer match is expressed in two parts: a match rate and a cap. A very common formula is "50% of your contributions up to 6% of salary." That breaks down as:
- The match rate is 50% — the employer adds 50 cents for every dollar you contribute.
- The cap is 6% of salary — they only match contributions up to that share of your pay.
On a $90,000 salary, contributing 6% means you put in $5,400 and your employer adds $2,700. That's an instant 50% return on those contributions, before the market does anything at all. If you contribute only 3%, you get just $1,350 in match and forfeit the other $1,350 — every single year.
Other common formulas
Not all matches look the same. You might see "100% up to 3%" (a full dollar-for-dollar match on the first 3%), or tiered formulas like "100% on the first 3%, then 50% on the next 2%." The mechanics are the same: find your cap, contribute at least that much, and you've captured the maximum free money. Anything beyond the cap is still good saving — it just no longer earns a match.
Watch the vesting schedule
Your own contributions are always 100% yours. But the employer's match may be subject to a vesting schedule — you may have to stay employed for a few years before the matched dollars are fully yours. With "cliff" vesting you get nothing until a set date, then 100%; with "graded" vesting you earn a rising percentage each year. If you're considering leaving a job, knowing where you stand on the vesting schedule can be worth thousands.
Match first, then think bigger
A sensible priority order for most people: contribute enough to get the full match first, then build an emergency fund and tackle high-interest debt, then return to increase retirement savings toward a target like 15% of income (match included). The match comes first precisely because its return is unmatched by anything else.
See what the match is worth over time
The real power of the match shows up over decades, as those extra dollars compound. Our retirement calculator lets you set your contribution rate, the match rate, and the match cap, then projects your balance to retirement — try setting your contribution below the cap and watch the employer-match total drop to see exactly what you'd be giving up.
Raising your contribution also changes your paycheck today. Our guide to take-home pay by state helps you see how a pre-tax contribution affects what actually lands in your account, so you can size it comfortably.
Educational information, not investment advice. Match formulas and vesting rules vary by employer — check your plan documents.