What does vesting mean, and why does it matter when you quit?

Vesting determines when you own something an employer has granted. It applies to two main categories: employer contributions to a retirement plan, and equity compensation such as stock options and restricted stock units. Your own 401(k) contributions are always immediately and fully yours; the employer match may not be. Common schedules include cliff vesting, where nothing vests until a specified date and then all of it does, and graded vesting, where a percentage vests each year. Federal law caps how long employer retirement contributions can take to vest, but within those limits plans vary considerably.

Equity vesting typically runs over four years with a one-year cliff, meaning you receive nothing if you leave before the first anniversary and then vest in monthly or quarterly increments afterward. The financial consequence of timing is concrete: resigning three weeks before a cliff or a large vest forfeits that entire tranche. Knowing your exact dates before you begin a job search, and negotiating a start date at a new employer that clears them, is a legitimate and common practice worth thousands of dollars for the cost of a conversation.

Several details are worth confirming in the plan documents rather than assuming. Whether your plan counts years of service from hire date or plan year, since the difference can move a vesting date by months. What happens on termination without cause, layoff, or acquisition, since some equity agreements contain acceleration provisions and others do not. The exercise window for vested stock options after departure, which is traditionally ninety days and forces a decision about paying to exercise while the shares may be illiquid. And whether a signing bonus carries a clawback requiring repayment if you leave within a set period, which is increasingly common and frequently overlooked until the demand letter arrives.