The highest-return investment you’ll ever make
An employer match is a guaranteed, instant 50% to 100% return on every matched dollar — before any market growth. Nothing else in personal finance comes close, which is why “capture the full match” sits at the top of nearly every priority list, ahead of extra debt payments and taxable investing. Yet a large share of workers contribute below their plan’s match cap, quietly forfeiting part of their compensation every payday.
This calculator applies your plan’s exact formula — match rate and cap — to your salary and contribution level, then shows the annual match, any unclaimed amount, and what those employer dollars alone compound into by your retirement date at a 7% average annual return.
Decoding common match formulas
| Plan says | On an $80,000 salary it means |
|---|---|
| 100% up to 3% | Contribute $2,400 → employer adds $2,400 |
| 50% up to 6% | Contribute $4,800 → employer adds $2,400 |
| 100% up to 3% + 50% on next 2% | Contribute $4,000 → employer adds $3,200 |
For tiered formulas like the last row, run each tier through the calculator separately, or use the total effective rate. And remember vesting: employer money may take several years to become fully yours if you change jobs.
If you can’t reach the cap today
Move toward it in steps: raise your contribution by one percentage point now, then again at every raise — most plans let you automate the annual increase. Because contributions are pre-tax (traditional) or come with long-term tax-free growth (Roth), the hit to take-home pay is smaller than the sticker percentage suggests.
Frequently asked questions
How does a 401(k) employer match work?
Your employer contributes to your 401(k) based on what you contribute, up to a cap. A common formula is “50% of your contributions up to 6% of salary”: if you earn $80,000 and contribute 6% ($4,800), your employer adds 50% of that ($2,400). Contribute less than the cap and the employer contribution shrinks too.
What does “100% match up to 3%” mean?
For every dollar you put in, your employer puts in a dollar, until your contributions reach 3% of your salary. Beyond that threshold your contributions still grow your account, but they trigger no additional employer money.
Is the employer match really a 50–100% instant return?
Effectively yes. A 100% match doubles every matched dollar the moment it lands; a 50% match adds half. No investment offers a comparable guaranteed instant gain, which is why the standard advice is to contribute at least enough to capture the full match before doing almost anything else with spare money.
What is 401(k) vesting?
Vesting is the schedule by which employer contributions become truly yours. Your own contributions are always 100% yours immediately, but employer money may vest gradually (e.g., 20% per year over 5 years) or all at once after a cliff (e.g., 3 years). Leave before vesting and you forfeit the unvested portion — check your plan document.
Do employer contributions count against my annual 401(k) limit?
Not against your employee deferral limit — that limit applies only to what you contribute from your paycheck. There is a separate, much higher combined limit for employee plus employer contributions. Both limits adjust most years; check irs.gov for the current figures.