A 401k vesting cliff can decide how much of your employer match you keep when you change jobs. This post explains how a 401k vesting cliff works, where to find your own vesting date, what a reported example of a person weighing a move looks like, and the steps that turn it into a plan.
How a 401k Vesting Cliff Works
The IRS says employee contributions, including salary deferrals, are always 100% vested. For employer contributions in 401(k) and profit-sharing plans, the plan document sets the schedule, which may be immediate, cliff or graded. The IRS gives these illustrations: with cliff vesting you are 0% vested through year 2 and 100% at year 3, and with graded vesting you are 20% at year 2, 40% at year 3, 60% at year 4, 80% at year 5 and 100% at year 6 (IRS Retirement Topics: Vesting).
| Years of service | Cliff | Graded |
|---|---|---|
| 2 | 0% | 20% |
| 3 | 100% | 40% |
| 6 | 100% | 100% |
These are the minimum schedules for matching contributions under the tax code, and a plan may vest faster, including immediately. For a traditional safe harbor 401(k), matching contributions must be 100% vested at all times, and for a QACA safe harbor they must be 100% vested after no more than two years of service (IRS Issue Snapshot). The Labor Department adds that if you leave before you are vested you may lose unvested employer money, while vested amounts stay with you, and that you become 100% vested if the plan terminates (U.S. Department of Labor).
What Counts as a Year of Service
The IRS says a year of service is generally 1,000 hours worked in 12 months, though the plan defines the exact counting method. Unvested amounts may be forfeited when you are paid out your balance, such as after leaving, or after five years in which you work no more than 500 hours a year (IRS). The Labor Department notes that earlier service may count if you return to a former employer, depending on the break and the plan’s rules (DOL).
How Common Are Waiting Periods?
Vanguard’s How America Saves 2024 data, as summarized by PSCA, shows about half of plans (49%) use immediate vesting. The most common alternatives were a five-year graded schedule (16% of plans) and a three-year cliff (9%) (PSCA). So many people have no waiting period, and your plan’s own terms are what matter.
A Reported Case
A 24/7 Wall St. article (July 21, 2026) describes a 59-year-old software project manager with about $74,000 in unvested employer contributions under a five-year cliff schedule. He was three years and eight months in, about 16 months short of full vesting, and was weighing a competing offer with a $30,000 raise. It suggests only that a new employer’s signing bonus, equity grant or salary increase should cover any forfeited money (24/7 Wall St.). By my arithmetic, a five-year cliff means 60 months, so 3 years 8 months in leaves 16 months.
401k Vesting Cliff: An Example With Assumed Numbers
Suppose a worker has $20,000 of unvested match and the new employer offers a $5,000 signing bonus. Then $15,000 of the forfeiture remains uncovered. Separately, suppose a plan on the six-year graded schedule receives $4,000 of match a year, so $12,000 after 3 years. At 40% vested the worker keeps $4,800 and forfeits $7,200 on leaving. These are only arithmetic, not predictions.
Steps to Plan Around a 401k Vesting Cliff
- Find the schedule. The Labor Department says the Summary Plan Description explains the vesting schedule and how service is counted, and that you should receive it within 90 days of becoming a participant. You can request another copy (DOL).
- Check the plan documents. Betterment’s help page says the plan highlights and the Adoption Agreement’s vesting section describe how vesting is calculated, including exceptions such as full vesting on death or disability (Betterment).
- Ask the plan administrator. The Labor Department suggests asking what percentage you are vested in today, how years of service are counted, what date starts your count, and whether working until a certain date raises your vested percentage (DOL).
- Compare the dates. Put your vesting date next to the new job’s start date. In my suggestion, a short delay that crosses a vesting date may cost less than the forfeited amount.
- Raise the amount in the negotiation. In my view, mentioning the specific dollar figure to the new employer is reasonable, and a written agreement is better than a verbal one.
My Take on 401k Vesting Cliff
- In my view, finding your exact vesting date and the unvested dollar amount comes before any decision, since the cost depends on those two numbers.
- In my view, asking a new employer to cover forfeited money is reasonable. I found no data on how often employers agree, so I’m not claiming a success rate.
Whatever your own 401k vesting cliff looks like, the plan is the same: find the vesting date in your plan documents, compare it with your move date, and price the unvested match before you decide. For why the match is worth capturing in the first place, see our look at the 401(k) match.
Sources
- 24/7 Wall St.: The 401(k) vesting cliff that cost one worker $74,000 (July 21, 2026)
- PSCA: Vesting schedules may do little to promote retention: Vanguard (Feb. 2025)
- IRS: Retirement topics, Vesting
- IRS: Issue snapshot, Vesting schedules for matching contributions
- U.S. Department of Labor: What you should know about your retirement plan
- Betterment: How can I check my 401(k) plan vesting schedule?
This article offers general information and my own opinions, not financial, tax, or legal advice. The figures in worked examples are assumed. Laws, tax rules, and products change and can differ by location, so check current official sources and talk to a qualified professional about your own situation.