Vesting cliff
What is a vesting cliff?
A vesting cliff is the earliest date on which any equity under a vesting schedule can vest. Until the cliff is reached, no shares or options vest at all. The standard structure is a 1-year cliff within a 4-year schedule: 25% vests on the 12-month anniversary, then the remaining 75% vests monthly over the following 36 months. This structure is referenced in standard option plan documentation under IRS Section 422 for ISO compliance.
How does the standard 4-year vesting with 1-year cliff work?
| Timeline | What vests on a 48,000 share grant |
|---|---|
| Month 1 to 11 | 0 shares, cliff not yet reached |
| Month 12 (cliff date) | 12,000 shares vest immediately (25%) |
| Month 13 onwards | 1,000 shares vest each month for 36 months |
| Month 48 | 48,000 shares, fully vested |
Why do vesting cliffs exist?
The cliff protects the company and other shareholders from an employee or co-founder who leaves shortly after joining with a large equity stake. Without a cliff, someone joining for 3 months could vest 6% of their 4-year grant before departing. Investors require founder vesting with a cliff at Series A if not in place at founding. The NVCA model documents treat founder vesting with a cliff as standard in institutional investment.
How does the vesting cliff affect employee behaviour and retention?
The one-year cliff functions as a probationary period with a financial incentive to complete it. Employees who leave before 12 months receive no equity, creating a strong financial incentive to stay through the first year. After the cliff, monthly vesting creates ongoing retention incentives, but the incentive weakens significantly in the third and fourth year when remaining unvested equity is a smaller proportion of total grant value. Companies that want to retain employees through the full four-year schedule typically issue refresh grants in years two and three, creating a rolling cliff on the new shares that restarts the retention incentive without restarting the original grant.
What happens to unvested options when a company is acquired before the cliff?
When a company is acquired before an employee's cliff date, their unvested options are typically handled in one of three ways: (1) accelerated vesting if the employee's agreement includes single or double trigger acceleration, (2) conversion to acquirer equity on the original vesting schedule if the acquirer assumes the option plan, or (3) cancellation for cash consideration if the acquirer does not assume the option plan. Which outcome applies depends entirely on the employee's offer letter and the acquisition agreement. Employees who joined less than 12 months before an acquisition and have no acceleration provisions receive nothing from their equity. This is a significant risk that founders should disclose honestly when recruiting. The NVCA model agreements address acceleration provisions in the context of acquisition, but the specific terms vary significantly by company.
What do founders get wrong with vesting cliffs?
The most common mistake is not having a vesting cliff for co-founders. Many founding teams issue shares to co-founders without reverse vesting provisions at all, meaning a co-founder who leaves after 6 months retains their full equity allocation. Institutional investors at seed and Series A will require reverse vesting with a cliff as a condition of investment. Retrofitting reverse vesting onto already-issued shares is complicated and requires the departing founder's consent. Founders should implement co-founder reverse vesting with a 1-year cliff at incorporation, before any investor conversation begins.
A second error is using the same cliff length for all employee types. Senior executives and key engineers who leave before 12 months create significant business disruption but receive no equity under the standard cliff. Some companies use a 6-month cliff for senior hires with immediate monthly vesting from day one on a smaller tranche, then transition to the standard 1-year cliff on the remainder. This gives senior hires immediate equity participation while preserving the retention incentive.
Third: not communicating the cliff clearly to candidates during recruitment. Candidates who accept a role and leave at 11 months because they receive a better offer, unaware that they would have vested a full year of options the following month, create a poor experience and reputational risk. Clear, written communication of the vesting schedule including the cliff at the offer stage prevents misunderstandings and sets honest expectations.
How it works in practice
Case example: Co-founder departure before cliff
Three co-founders start a fintech company in January 2024. Each receives 2,000,000 shares vesting over 4 years with a 1-year cliff. Founder C departs in October 2024, two months before the cliff, following a disagreement over product direction.
Under the cliff provision: Founder C vests zero shares. Their 2,000,000 shares return to the company's unissued pool. The company buys back any shares Founder C received at incorporation for nominal consideration (covered in the founders agreement).
Without the cliff: Founder C would have vested 9/48ths of their grant (about 375,000 shares, or 6.25% of the company) before departing. At Series A a year later at a $12M post-money, those shares are worth approximately $750,000. The cliff provision protects the remaining founders and future investors from that outcome.
Frequently asked questions
What happens if I leave before the cliff?
All unvested shares lapse immediately and return to the option pool. Leaving one day before the cliff means vesting nothing from that grant. This is the entire purpose of the cliff mechanism, it creates a minimum commitment period before any equity accrues.
Can the cliff period be shorter than 12 months?
Yes, it is negotiable. Some companies use a 6-month cliff for senior external hires to remain competitive on compensation. Anything shorter than 6 months is unusual in venture-backed companies. Founder vesting at institutional companies almost always uses a 12-month cliff.
Does the cliff apply to advisor grants?
Typically no. Advisory share grants usually vest monthly from the grant date with no cliff, reflecting the nature of ongoing advisory contributions rather than a defined onboarding period.
What happens to unvested shares if the company is acquired before my cliff?
This depends on the acquisition agreement. Some acquisitions include single-trigger acceleration, which vests all unvested grants immediately on acquisition. Others use double-trigger acceleration, requiring both the acquisition and a subsequent termination without cause for acceleration to apply. The option plan and offer letter govern which applies.
What happens to unvested options if a company shuts down before the cliff?
If the company dissolves before any employee reaches their cliff, all unvested options are cancelled and employees receive nothing from their equity. Vested options theoretically have value, but in a dissolution there are typically no proceeds to distribute to common shareholders after secured creditors and liquidation preferences are satisfied. This is why option equity should always be communicated as potentially worthless rather than as guaranteed compensation.
Related glossary terms
- Option Pool, the equity reserve from which vesting grants are made
- Stock Options (Startup), how ISO and NSO options are structured and taxed as they vest through the cliff schedule
- Founders Agreement, the document that establishes founder vesting including the cliff provision
Explore related Fintera content
- Fractional CFO for Startups: The 2026 Playbook, how a fractional CFO audits option plan compliance including vesting schedule structure
- Fractional CFO Services: Scope, Tiers and Stage Fit, the equity administration scope covered in a fractional CFO engagement
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