401(k) employer match: how not to leave free money behind
By FinTools Content updated
An employer match adds plan contributions based on how much an eligible employee contributes. The amount you receive and keep depends on the plan's formula, eligibility, and vesting rules. This guide illustrates match formulas and their possible long-term effect under fixed assumptions.
The 10-second answer
Read your plan's match formula. Under a simple 50% match on contributions up to 6% of salary, a 6% employee contribution reaches the match ceiling. Other formulas, eligibility conditions, and payroll timing can change the result. Your plan document determines the available 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
In a hypothetical example, a $2,400 match deposited at each year end grows to about $226,706 after
30 years at a fixed 7% annual return. A $1,200 annual match grows to about $113,353. The calculation is
annual match × ((1.07^30 − 1) / 0.07), with no salary changes, fees, taxes, or withdrawals
and full ownership of every match contribution. Actual returns and plan terms can differ.
The vesting caveat
Your own salary deferrals are fully vested. Employer contributions may become yours immediately or over a schedule, depending on the plan. Leaving before full vesting can reduce what you keep. See the IRS explanation of retirement plan vesting and your plan document for the applicable rules.
Match vs paying down debt
A match percentage describes a conditional contribution; debt APR describes an annual borrowing cost. Comparing those percentages alone cannot determine which use of money fits a household. Cash needs, required debt payments, vesting, plan access rules, fees, and taxes also matter. You can compare debt payoff scenarios using Avalanche vs snowball, but these examples do not prescribe an order for your contributions and debt payments.
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.