Front-loading your 401(k) can cost you the match

Can maxing out your 401(k) early really cost you money?

Yes — when two things are true: your employer pays the match one paycheck at a time, and the plan has no year-end "true-up" (a make-up deposit that fixes uneven timing, explained below). If you front-load and hit the annual contribution limit before December, your paycheck contributions stop, and the match riding on them stops right along with them. You spend the rest of the year earning a salary and collecting no match.

It sounds backwards, so it's worth seeing the mechanism before the money. The trap has nothing to do with how much you save for the year — you might contribute the exact same total either way. It's purely about timing: cram the contributions into the first few months and the match you'd have earned in the last few months never gets paid.

How does the employer match actually get paid?

Most matches follow a formula like "we match 100% of what you put in, up to 5% of your pay." The key detail is that the cap is applied to each paycheck, not to the whole year. So on a $200,000 salary paid every two weeks, each of your 26 paychecks is about $7,692, and the match on that check tops out at 5% of it — around $385.

Earn that $385 on all 26 paychecks and the match adds up to $10,000 for the year. But here's the part that bites: the match on a paycheck only shows up if you actually contribute on that paycheck. Miss a paycheck — because you've already hit the limit and stopped — and its $385 of match doesn't roll over. It's just not paid.

What does front-loading forfeit?

Take that $200,000 salary and suppose you set your deferral to 30% of each paycheck to "get it done early." At 30% you put in about $2,308 a paycheck, and you cross the 2026 limit of $24,500 on your 11th paycheck — not even halfway through the year. From paycheck 12 on, you contribute $0, so you earn $0 in match for the final 15 paychecks.

You captured 11 paychecks of match — about $4,231 — and forfeited the other $5,769. Had you spread the same $24,500 evenly (roughly $942 a paycheck), you'd have cleared the 5% cap all 26 paychecks and kept the whole $10,000. Same money in, same year, one of them just leaves $5,769 of free money uncollected.

The more aggressively you front-load, the earlier you stop and the more you give back:

Notice the first row: defer 10% and you contribute $20,000 for the year — under the $24,500 limit — so you never stop, never miss a paycheck, and keep every dollar of match. The trap only springs once your rate is high enough to hit the ceiling early.

What is a 401(k) true-up, and does your plan have one?

A true-up is a safety net some employers build in. After the year closes, the plan looks at your total contributions against your total pay and pays any match you missed by contributing unevenly. With a true-up, front-loading costs you nothing — you get the full $10,000 either way, just a little later.

The catch is that not every plan has one. In recent industry surveys, on the order of two-thirds of matching plans did a year-end true-up — but a sizable share did not. If yours is one that doesn't, and it caps the match each paycheck, the forfeited match in the table above is real money gone for good.

You can't tell from your paycheck, so ask. HR or your plan administrator can answer "does the plan true up the match at year-end?" in one word. If it's no, treat the even-spread approach as the default.

Who does this actually hit?

Here's the honest part: this trap doesn't touch most people. It only bites savers who contribute enough to reach the $24,500 limit before the year ends — which is exactly the diligent, high-contributing crowd who think they're doing everything right. Put in a modest percentage and you'll never hit the ceiling, so there's no early stop and nothing to forfeit.

It also lands harder the more you earn, because a bigger paycheck reaches the fixed limit sooner. Hold the deferral at 30% and watch the forfeited match climb with salary:

How do you keep the whole match?

The simplest fix is to spread contributions across all your paychecks so you land near the limit in December, not June. Divide the limit by your number of pay periods — $24,500 across 26 checks is about $942 each, or roughly 12% of a $200,000 salary — and set your deferral there. You clear the cap every paycheck and collect the full match.

If you'd rather front-load — to get money invested sooner, or because you're leaving the job mid-year — first confirm the plan trues up. With a true-up, front-loading is a fine strategy and the timing worry disappears. Without one, the even spread is the quietly richer choice.

The per-paycheck detail behind this trap is the same reason two people on the same salary can see different-sized checks — see why one paycheck looks smaller. And once you've locked in the full match, the next question is how much you need invested to stop worrying — that's Coast FIRE.

Frequently asked questions

Last reviewed July 2026. This guide is for education, not financial advice. Contribution limits and match rules follow IRS figures and your plan's own documents.