Roughly one in five employees contributes below their company's match threshold, which is the same as declining part of your salary. The mechanics aren't complicated, but they're written in plan language nobody reads. Here's what the formulas mean, the front-loading trap that silently costs high earners thousands, and what actually belongs to you when you leave.
Every match has two numbers: a rate (cents per dollar you contribute) and a cap (the percent of your salary it applies to). Three structures cover most plans.
Dollar-for-dollar: the employer matches 100% of your contribution up to the cap. "100% of the first 3%" means contribute 3% and they double it. Contribute 10%, they still stop at 3%.
Partial (most common: 50 cents on the dollar): the employer adds half of what you put in, up to the cap. "50% of the first 6%" costs you 6% of salary to earn 3% of salary in match. Partial matches lure you into contributing more, which is exactly why employers like them.
Tiered: a blend, like 100% of the first 3% plus 50% of the next 2%. Full match requires contributing 5%, and it pays 4% of salary.
| Formula | You contribute | Employer adds (on $75,000) | Max match value |
|---|---|---|---|
| 100% of first 3% | 3% ($2,250) | $2,250/yr | 3% of pay |
| 50% of first 6% | 6% ($4,500) | $2,250/yr | 3% of pay |
| 100% of 3% + 50% of 2% | 5% ($3,750) | $3,000/yr | 4% of pay |
| 100% of first 5% | 5% ($3,750) | $3,750/yr | 5% of pay |
Vanguard's How America Saves data puts the average employer contribution around 4-5% of pay, so those middle rows are the market rate. Run your own salary and formula through the 401(k) match calculator to price your plan in seconds.
Most plans calculate the match per paycheck. If a paycheck has $0 of elective deferrals, it earns $0 of match. That becomes a problem for front-loaders: high earners who set their rate high enough to hit the IRS deferral limit ($24,500 in 2026) before December.
Concrete case. A $200,000 earner contributes 20% of every biweekly paycheck, about $1,538. The $24,500 limit runs out during the 16th of 26 paychecks. On a 4% tiered match, those first 16 checks earned about $4,923. The final 10 checks contribute nothing and match nothing, forfeiting 10 x $307.69 = $3,077. The fix is arithmetic, not sacrifice: set your rate to $24,500 / 26 paychecks / semi-monthly pay, or 12.25% here, and collect the full $8,000.
An annual true-up makes the problem disappear: the plan computes the match on total-year contributions and pays any shortfall as a lump sum, usually in Q1. If your plan true-ups, front-load freely. It's one of the first questions to ask HR.
The match itself doesn't count against your $24,500. Your own dollars are the only ones under that cap.
Vesting is the schedule that converts employer money into your money. Three flavors:
Your own contributions vest immediately, always. The practical upshot: a job change late in a cliff window is worth negotiating around, because a $15,000 unvested balance is real compensation hanging on the departure date.
Then let compounding do the heavy lifting. A $3,000 annual match invested for 30 years at a 7% average return grows to about $283,000; see it move in the compound interest calculator. For the bigger question of whether your total savings rate gets you to retirement, the retirement calculator picks up from there.
Salary, formula, contribution rate. See annual match, per-paycheck match, and the front-loading penalty.
401(k) Match Calculator →This guide explains how plans generally work, not how yours specifically does. Match formulas, true-up provisions, and vesting schedules vary by plan document, so confirm details with your summary plan description or HR before making moves. Nothing here is investment or tax advice.
Yes, before almost any other financial move except extreme debt. The match is an instant 50% to 100% return on every matched dollar. A 4% match on a $75,000 salary is $3,000 a year of employer money; contributing only 2% forfeits $1,500 of it. Nothing else in your portfolio reliably doubles or 1.5x's your money the day you invest it.
Yes, if your plan matches per paycheck and has no annual true-up. High earners who front-load and hit the $24,500 deferral limit by summer end up with $0 withheld, and $0 match, for the rest of the year's paychecks. A $200,000 earner contributing 20% per biweekly paycheck hits the limit after 16 checks and forfeits about $3,077 of a 4% match. Spread contributions across all paychecks unless your plan true-ups.
You always keep 100% of your own contributions. The match depends on vesting: immediate (yours forever), cliff vesting (0% until a date, typically 3 years, then 100%), or graded (20% per year over 6 years is common). Leave before the cliff and every matched dollar goes back to the plan. Your balance statement shows your current vested balance.