Money an employer puts into a retirement plan is not automatically the employee's to keep. Vesting determines when it becomes theirs, and the timing shapes job moves.
Two pots with different rules
Contributions an employee makes from their own paycheck belong to them immediately. Nothing an employer does later can take them back.
Employer contributions are different. They are deposited into the same account but remain conditional on the employee staying for a defined period.
Account statements often show a single balance, which is why many people are unaware that part of it is not yet unconditionally theirs.
Cliff and graded schedules behave differently
A cliff schedule grants nothing until a threshold date, then grants everything at once. Before that date, leaving forfeits the entire employer portion.
A graded schedule releases the employer contribution in increments over several years, so departure at any point keeps a proportional share.
The distinction changes how a resignation date should be read. Under a cliff, a few weeks can be worth the whole employer balance; under a graded schedule, the loss is partial.
Forfeited amounts do not vanish
When an employee leaves unvested, the employer contribution returns to the plan rather than to the employee. Plans generally apply it to future contributions or plan costs.
This is why vesting exists at all: it is a retention tool, converting a benefit into an incentive to remain past a particular date.
Employees rarely see it framed that way, because the benefit is presented as compensation during hiring and the condition appears only in plan documents.
Job hopping compounds the effect
Someone who changes employers frequently may repeatedly leave before vesting, receiving a full salary each time while capturing little of the retirement match.
The gap does not appear on a pay stub. It shows up decades later as a smaller accumulated balance than the person's earnings history would suggest.
Whether that matters depends on how much the raise from moving exceeds the forfeited match, an arithmetic comparison rather than a general rule.
Rollovers carry only what is vested
On leaving, an employee can typically move the account elsewhere. Only the vested portion travels; the rest was never transferable to begin with.
Plan rules also vary on small balances, and the details of eligibility, timing, and distribution differ between employers and change over time.
Reading the summary plan description before setting a departure date is the only reliable way to know which schedule applies, since none of it is standardized across American employers.