The 401(k) Vesting Mistake That Cost a Pre-Retiree $74,000 in Forfeited Match

"Under ERISA, a 401(k) plan that uses graded vesting on the employer match cannot stretch the schedule beyond six years. A cliff schedule cannot exceed three years. Plenty of large tech and finance employers use the full runway, often a 4-year cliff or a 20% per year graded schedule starting in year two."

"Her plan was the latter. By the end of year four she was 60% vested. Year five would have taken her to 80%. Year six, 100%. Walking away at the year-five mark crystallized the 60% number and locked her out of the rest. The forfeited $74,000 went back into the plan to reduce future employer contributions for everyone else still on the payroll."

"That is the headline cost. The hidden cost is compounding. Even at a modest 6% real return, $74,000 left alone for 20 years roughly triples. The true cost of that timing was closer to a quarter of a million in 2046 dollars, well beyond the headline $74,000 of retirement money."

"Households are not stockpiling cash to absorb mistakes like this. The personal savings rate has fallen from 6% in early 2024 to 4% in the first quarter of 2026. With the federal funds rate parked at around 4%, replacing forfeited match dollars from a savings account is a multi-decade project. Every dollar of match left on the table is a dollar that has to be re-earned with after-tax income that is already saving less."

A 401(k) employer match can be subject to vesting schedules that determine how much is kept after leaving employment. Under ERISA limits, graded vesting on employer match cannot extend beyond six years, and cliff vesting cannot exceed three years. Many large employers use schedules such as a four-year cliff or graded vesting that starts in year two. Leaving before the final vesting cliff can crystallize a lower vested percentage and forfeit the remainder back to the plan. The forfeited amount can also lose long-term compounding, increasing the effective cost far beyond the forfeiture value. Lower household savings rates and higher interest rates make replacing lost match dollars harder.

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