What it means
At its simplest, vesting is a retention device dressed up as a reward. A company hands you a stake in its future, then attaches a time requirement or a performance requirement so that the value only lands in your hands if you stay long enough or deliver what was agreed.
The mechanics matter because unvested equity is not really yours yet. If you resign in month eleven of a four-year grant with a twelve-month cliff, you typically leave with nothing from that grant, even though you may have watched the share price triple.
This is why experienced hires negotiate vesting terms as hard as they negotiate salary. Vesting also protects the company and the other shareholders.
Without it, a co-founder could take a large stake, leave after three months, and keep a slice of a business that other people spent a decade building. Founder vesting, where even the founders earn their own shares back over time, is standard in venture-backed companies for exactly this reason.
There are two broad flavours. Time-based vesting depends purely on continued service, while performance-based vesting depends on hitting a target such as a revenue milestone, a profitability threshold or a share price level.
Many senior packages mix both, so an executive must both stay and perform. One nuance that trips people up is the difference between vesting and exercising.
Vesting means an option is now available to you; exercising means you actually pay the strike price and take the shares. A vested option that is never exercised before it expires is worth nothing.
In practice
Real-world examples.
Example
A software engineer joins a growing payments company and is granted 20,000 options that vest over four years. She stays for three years, vests 15,000 options, and forfeits the remaining 5,000 when she moves to a competitor.
Example
A logistics firm gives its regional directors restricted shares that vest only if group operating profit exceeds $12 million in any of the next three financial years. Two directors vest in year two when the target is beaten; the award lapses for a division that misses.
Example
An accountancy practice enrols staff in a pension scheme where employer contributions vest after two years of service. A trainee who leaves after 18 months keeps her own contributions but loses the employer portion.
Think of it
“Vesting is earning ownership of employer contributions-they become yours over time.
Formula
Calculation
Vested units = Total grant x Portion of the vesting conditions satisfied
Priya receives a grant of 48,000 share options with a four-year vesting term, a one-year cliff and monthly vesting after that. At the cliff she vests 25% of the grant: 48,000 x 25% = 12,000 options. The remaining 36,000 options vest evenly over the next 36 months, which is 36,000 / 36 = 1,000 options per month.
Priya leaves after 30 months of service. That is the 12,000 cliff options plus 18 further months of monthly vesting: 12,000 + (18 x 1,000) = 30,000 vested options. The other 18,000 options are forfeited. If the shares are worth $6 each and her strike price is $2, her vested position carries a gain of ($6 - $2) x 30,000 = $120,000 before tax.Case study
Seen in the real world.
This is an illustrative, fictional example. Kelvin Row Analytics, a made-up data consultancy, hired a head of sales with a grant of 40,000 options vesting over four years with a one-year cliff. The founders assumed the grant would keep him focused through a difficult first year of rebuilding the pipeline.
He left at month ten, three weeks before the cliff, after a competitor offered cash instead of paper. Because nothing had vested, he walked away with no equity at all, and Kelvin Row recycled the full grant into the option pool for his successor.
The board drew two lessons. Cliffs do protect the company from short-tenure departures, but a grant that is worth nothing for a year gives a candidate very little reason to stay through a rough patch, so the next offer paired a smaller grant with a meaningful cash bonus at month twelve.
Watch out
Common mistakes.
- Treating a grant letter as though the shares are already owned, and counting the full paper value as personal wealth before any of it has vested.
- Confusing vesting with exercising, and assuming vested options automatically turn into shares without paying the strike price.
- Resigning without checking the vesting calendar, and missing a cliff or a tranche date by a matter of weeks.
Questions
People also ask.
What happens to unvested equity if the company is acquired?
It depends on the plan documents; some grants accelerate fully on a change of control, others accelerate only if you are also made redundant, and many simply roll over into the buyer's shares.
Can a company change a vesting schedule after the grant is made?
Not unilaterally in most jurisdictions, because the grant is a contract, though employees can be offered a new grant on different terms.
Does vesting create a tax charge?
Often yes, particularly for restricted stock units, where the market value of the shares on the vesting date is usually treated as employment income.
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