What is a vesting cliff? One-year, two-year, and ERISA versions

A vesting cliff is the date on which a chunk of equity vests all at once, after a stretch during which nothing vests at all. The word "cliff" describes the shape of the graph: flat at zero, then a vertical jump to a positive percentage on a specific day.

The most common shape in US technology compensation is the four-year grant with a one-year cliff. Nothing vests before month 12. On the first anniversary of the vesting-start date, 25% of the grant vests in a single event. The rest vests monthly or quarterly across the next three years. Leaving on day 364 means zero. Staying one more day means one quarter of the grant.

The mechanic is legal, standard, and priced into every offer letter that includes equity. It is also the specific mechanism that decides whether someone leaves a job in month 11 or month 13, and the difference is often a six-figure number.

What a vesting cliff actually is

A vesting cliff is a scheduled forfeiture rule. Before a specific date, the employee has no legal right to the promised equity. On that date, a defined percentage becomes nonforfeitable. Between grant and cliff, the employee holds a contractual promise; after cliff, the employee holds shares.

The word "cliff" refers to the visual shape of the vesting schedule, not any drama around the date itself. On a vested-percentage graph, a cliff appears as a vertical line. A graded vesting schedule, by contrast, appears as a staircase.

The vesting cliff period is the interval between the vesting-start date and the cliff date. In tech, that period is almost always 12 months. In some finance and leadership packages, it is 24 months. In ERISA-covered retirement plans, the federal ceiling is 3 years for individual account plans and 5 years for defined benefit pensions, per 29 U.S. Code § 1053.

Cliff vesting on stock options works the same way as cliff vesting on restricted stock units, with one difference. With options, the cliff makes the option exercisable; the employee still has to pay the strike price to actually own the shares. With RSUs, the cliff crossing delivers the shares directly and triggers ordinary-income tax on the market value at that moment, per IRS Publication 525.

The two shapes you will see in an offer letter

Two cliff structures cover the majority of US equity compensation.

The one-year cliff. Four-year grant, 25% vests at month 12, then equal increments monthly or quarterly through month 48. Standard at almost every publicly traded US technology company and at most venture-backed startups past Series A. The one-year cliff is the industry default because it filters out very short tenures and aligns retention with the typical ramp-to-productivity window.

The two-year cliff. Same total horizon of three or four years, but nothing vests until month 24. Often 50% vests at the cliff, with the remainder monthly. Two-year cliffs show up in senior-executive retention packages, post-acquisition earn-outs meant to hold key employees through integration, and some private-equity-backed operating-company grants. Two-year cliff vesting is the structure of choice when the company specifically wants to guarantee two full years of tenure.

Beyond these two shapes, ERISA-covered retirement contributions can carry longer cliffs by statute. A 3-year cliff on the employer match to a 401(k) is common in industries with high turnover. A 5-year cliff on defined benefit pension participation still appears in older corporate and public-sector plans. The employer plan document is the source of truth; the summary plan description names the exact cliff length.

All three shapes are legal, common, and standard practice. What matters is the interaction between the cliff date and the employee's plans for the next 24 months.

What a 100,000-share grant looks like at month 11, month 13, and month 25

The math is easier to see with a specific case.

Consider a 100,000-share RSU grant, four-year vesting, one-year cliff, share price held constant at $50 for simplicity. Total notional value: $5,000,000, delivered as vesting occurs.

Month 11. Vested: 0 shares. Unvested balance: 100,000 shares worth $5,000,000. Cost of resigning: the entire grant. The employee walks away with nothing from the equity component.

Month 13. Vested: 25,000 shares from the cliff tranche at month 12, plus about 2,083 more from one post-cliff monthly increment, total roughly 27,083 shares. Vested value: about $1,354,000. Unvested balance: about 72,917 shares, still worth roughly $3,646,000. Cost of resigning: the unvested portion only.

Month 25. Vested: about 52,083 shares, worth roughly $2,604,000. Unvested: about 47,917 shares, worth roughly $2,396,000. Cost of resigning: the still-unvested balance.

Two things sit inside the numbers. First, the 60 days between month 11 and month 13 carry more than a million dollars of value transfer that hinges on a single date. Second, once past the cliff, the marginal cost of leaving declines linearly, but the absolute cost stays high enough to influence the decision for the full 48 months. This is the mechanism that keeps the golden-handcuff structure working; the full diagnostic on the trap and its exits sits in the main cluster piece.

Share price rarely holds constant across a four-year vest, which changes the numbers but not the shape. In a bull market, the unvested balance appreciates and the exit cost climbs. In a downturn, the unvested balance loses value and the cliff decision becomes about the promise rather than the price.

The four moments a cliff decides for you

A cliff date works as a decision structure that pre-commits four separate choices before they get made deliberately.

Job-offer timing. A candidate weighing a competing offer during the last months before a cliff will typically defer the answer until the cliff has cleared. The hiring side of the market knows this and paces its offers accordingly, which is why competing offers land more often just after known cliff dates than just before.

Resignation timing. Employees who have decided to leave often build the resignation calendar backwards from the next vesting event, not from the ideal transition date. A month-11 resignation is almost always a signal of something else going badly enough to override the number.

Layoff exposure. In a layoff, unvested equity is usually forfeited unless the severance package explicitly accelerates it. A layoff two weeks before a cliff carries a materially different outcome than one two weeks after. Employees rarely negotiate acceleration in advance; senior packages sometimes include it by default.

Unpaid leave and reduced schedules. Extended unpaid leave can pause or reset vesting depending on the plan document. Reduced-schedule employment can restart the vesting clock in some plans, though not most. The plan document is the source of truth on every one of these edge cases.

Each of these decisions gets made by the cliff whether the employee thinks about it or not.

What to ask HR before you sign, not after

The equity plan document contains all the answers. Most employees do not read it. A short list of questions covers the material terms:

• What is the exact vesting-start date? Grant date and vesting-start date are not always the same day.
• How many shares in the grant, and what is the strike price if the grant is an option?
• What is the cliff length, and what percentage vests on the cliff date?
• What is the post-cliff cadence: monthly, quarterly, or annually?
• What happens to unvested equity on voluntary resignation, involuntary termination for cause, layoff without cause, disability, and death?
• Is there any accelerated vesting on change of control, and if so, is it single-trigger or double-trigger?
• Are refresher grants planned or discretionary, and on what cadence?

Every one of these is answerable from the plan document, which HR can email in about ten minutes. Reading the answers takes an hour. Not reading them can cost more than a year of salary at a cliff crossing.

A four-year grant with no refresher grants planned looks generous at year one and starts to feel thin by year three, when the vested-per-year rate steps down as the cliff tranche recedes into the past. Grants stacked with annual refreshers create a rolling series of cliffs; the exit window that looked clear at signing turns into a moving target by year two.

The cliff is a structural feature, priced into the offer, and readable in the plan document. Missing it is expensive. Reading it is free.