
401(k) glossary
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Contributions & limits
Vesting schedule
Short definition
A vesting schedule sets how much of the employer’s contributions an employee keeps if they leave, based on years of service. Employees are always 100% vested in their own contributions.
What a vesting schedule is
Vesting means ownership. Money an employee defers from pay, and its earnings, is theirs immediately. Employer contributions, such as a match or profit sharing, can be earned over time. The tax code allows two kinds of schedule for 401(k) employer contributions, and a plan can always be faster:
Cliff: 0% until three years of service, then 100%.
Graded: 20% after two years, rising 20% a year to 100% after six years.
Safe harbor contributions must be 100% vested when made. A QACA safe harbor contribution can use a cliff of up to two years.
Why it matters to employers
Vesting is a retention tool and a cost lever. Amounts that departing employees do not vest in become forfeitures, which the plan can use to pay plan expenses or reduce future employer contributions. The plan document also defines a year of service, usually 1,000 hours in a 12-month period, and you have to track it accurately.
Example
An employee leaves after three years with $10,000 of employer match in her account. Under a six-year graded schedule she is 40% vested, keeps $4,000 and forfeits $6,000. Under a three-year cliff she keeps all $10,000.
Common mistakes
Applying the schedule to the wrong money, such as safe harbor contributions or employee deferrals.
Miscounting service for rehires, or ignoring service with a related company or a predecessor employer.
Forgetting the events that vest everyone fully: reaching the plan’s normal retirement age, plan termination and a partial plan termination after a large layoff.
Paying out a departing employee using the wrong vested percentage.
Basic Capital and this term
On Basic Capital, Safe Harbor employer contributions are 100% vested immediately, and the Traditional 401(k) lets the employer set the vesting schedule.
Go deeper
Read the full employer guide related to: Vesting schedule
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Sources
Internal Revenue Service: Retirement topics: Vesting (https://www.irs.gov/retirement-plans/plan-participant-employee/retirement-topics-vesting), retrieved 2026-11-11 U.S. Code (govinfo.gov): 26 U.S.C. 411: Minimum vesting standards (https://www.govinfo.gov/content/pkg/USCODE-2023-title26/html/USCODE-2023-title26-subtitleA-chap1-subchapD-partI-subpartB-sec411.htm), retrieved 2026-11-11 Internal Revenue Service: 401(k) plan overview (https://www.irs.gov/retirement-plans/plan-sponsor/401k-plan-overview), retrieved 2026-11-11
General information, not legal or tax advice.

