Two hidden 401(k) mechanics, vesting schedules and the absence of year-end true-up provisions, can eliminate thousands in employer matching contributions: under a three-year cliff schedule, an employee loses $6,000 in accumulated match by leaving at two years and eleven months, while lacking a true-up provision costs high earners up to 25% of annual matching if they max contributions early in the year.

Job mobility and aggressive early-year savings require careful attention to vesting milestones and true-up status because both mechanisms operate outside typical enrollment communication and can be verified only by requesting and reviewing the Summary Plan Description from your plan administrator.

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Your employer's 401(k) match most likely appears in the benefits summary of your employment contract or agreement as a dollar figure, and most employees treat it as guaranteed compensation. However, two mechanics buried in the plan documents can quietly erase thousands of dollars, and neither is explained at open enrollment.

Traditionally, employer matching contributions are almost never yours immediately, as they are subject to a vesting schedule, the legal mechanism that allows an employer to reclaim some or all of their contributions if you leave before a set number of years. The IRS permits two structures for matching contributions: cliff vesting and graded vesting.

Under a three-year cliff schedule, you own 0% of employer contributions until you complete exactly three years of service, at which point you own 100%. Leave at two years and eleven months under a cliff schedule, and you walk away with nothing the employer put in. Under a six-year graded schedule, ownership phases in incrementally: typically 20% per year starting in year two, reaching 100% by year six.

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It won't come as any surprise to learn that the dollar cost is real. For example, take an employee earning $100,000 with an employer that matches 50% of contributions up to 6% of salary. That is a $3,000 annual employer contribution. After two years under a three-year cliff schedule, the employer has deposited $6,000 into the account, but all of this money would be forfeited upon resignation. The employee's own $6,000 per year is always theirs, but the employer's $6,000 disappears entirely, which is a realization most people don't realize until after it takes place.

Under a six-year graded schedule, leaving after two years typically means owning 0% or 20% of employer contributions, depending on plan design, and losing most or all of the $6,000 accumulated match, depending on the plan's graded schedule.

With the unemployment rate at 4.4%, job mobility is real, and switching employers for a modest salary increase is tempting. What the offer letter does not show is the unvested match balance left behind.

The second mechanism affects high earners who front-load contributions early in the year. The 2026 employee contribution limit is $24,500, with a catch-up contribution of $8,000 for those aged 50 and older, and a super catch-up contribution of $11,250 for those aged 60 to 63. Someone aggressive about saving might hit the $24,500 ceiling by September or October.

Many employers calculate the match on a per-paycheck basis: they match a percentage of your contributions each pay period. Once you stop contributing because you have hit the annual limit, the employer stops matching, too. If your plan lacks a true-up provision, you forfeit the match for every paycheck from October through December. On a $100,000 salary with a 3% match, the annual employer match totals $3,000, and a full quarter of missed matching represents a material portion of that annual figure.

A true-up provision fixes this. At year-end, the plan administrator calculates the full-year match based on total annual compensation and deferrals, and deposits any shortfall. Plans with a true-up ensure each participant receives the full match for the plan year, regardless of when they made deferrals throughout the year. Plans without a true-up provision pay only what was matched per paycheck, leaving any shortfall uncorrected.

The fix for employees whose plans lack a true-up is straightforward: spread contributions evenly across all pay periods. On a biweekly payroll, that means contributing roughly $942 per paycheck to reach $24,500 by year-end without triggering a mid-year match shutoff.

Both the vesting schedule and the true-up provision are disclosed in the Summary Plan Description (SPD), a legal document every plan sponsor is required to provide. Every employee has the legal right to request it, but most never do.

The SPD will tell you exactly which vesting structure applies, the precise percentage owned at each year of service, and whether a true-up provision exists. It takes about ten minutes to read the relevant sections, and the information is specific to your plan.

Request your Summary Plan Description from HR or your plan administrator and locate the vesting schedule section. Identify whether your plan uses cliff or graded vesting and how many months remain before your next vesting milestone. If you are within six months of a cliff date, that milestone has a direct dollar value that should be factored into any job change decision.

Check whether your plan includes a year-end true-up provision. If it does not, recalculate your per-paycheck contribution rate to spread annual deferrals evenly across every pay period. For most biweekly payroll employees targeting the $24,500 limit, divide the annual cap by the number of pay periods to find the per-paycheck contribution rate.

If your combined household income exceeds $109,000 and you are approaching retirement, the match optimization conversation intersects with IRMAA thresholds and Social Security taxation. At that income level, a fee-only advisor can quantify the full tax picture, including IRMAA exposure, Social Security taxation, and match mechanics together.

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