401(k) employer match: how not to leave free money behind

An employer match is the only place in personal finance where a 50% or 100% instant return is offered routinely and legally. It is also routinely left unclaimed, usually because the formula sounds more complicated than it is. This guide decodes the common formulas and puts a dollar value on getting the full match for a working career.

The 10-second answer

Find your plan's match formula — most look like "50% of contributions up to 6% of salary" — and contribute at least the percentage after "up to." Below that threshold you are declining part of your compensation; above it, extra contributions still grow tax-advantaged but earn no additional match.

How common match formulas work

"50% up to 6%" means the employer adds 50 cents per dollar you contribute, until your contributions reach 6% of salary — so the match tops out at 3% of pay. "100% up to 4%" means dollar-for-dollar matching with a 4%-of-pay ceiling. Some plans tier the two together ("100% on the first 3%, 50% on the next 2%"), and some match in dollars rather than percentages. On an $80,000 salary with a 50%-up-to-6% formula, contributing 6% ($4,800) earns $2,400 of match; contributing 3% earns only $1,200, leaving $1,200 of pay unclaimed every year.

What a match is worth over 30 years

That $2,400 annual match, invested at a 7% return, grows to roughly $235,000 over a 30-year career — before counting salary growth, which raises the match every year. Even the "half-claimed" scenario compounds painfully: the $1,200 difference between a 3% and 6% contribution rate is about $117,000 of ending balance. The match itself is an immediate 50% or 100% return, and everything it earns afterward is ordinary compounding doing its long-horizon work.

The vesting caveat

Your own contributions are always yours. The employer's contributions may vest over time — typically "cliff" vesting (nothing until, say, 3 years, then everything) or "graded" vesting (20% per year over 5 or 6 years, for example). Leave before vesting completes and some or all of the match is forfeited. If you expect a short stay, the match's expected value shrinks accordingly; check the plan document rather than assuming. Vesting applies only to the match — never to your own deferrals.

Match vs paying down debt

A 50% instant return beats almost any APR, so contributing up to the full match usually comes before extra debt payments — even against credit cards. A 22% APR card costs 22 cents per dollar per year; a 50% match pays 50 cents per dollar immediately, plus decades of growth. The common ordering: capture the full match, then attack high-APR debt using a strategy from Avalanche vs snowball, then return to raising contributions. Long vesting with a short expected tenure is the main case where aggressive debt payoff jumps the queue.

Run your own match numbers

The 401(k) calculator takes your salary, contribution rate, and match formula, applies the 2026 IRS contribution limits, and projects the balance with salary growth, fees, and inflation. Try your current contribution rate, then the full-match rate, and look at the gap — then carry the result into the retirement calculator to see what it means for the plan as a whole.