The first time you fill in the equity section of an offer letter, you have to name a vesting start date and spell out when the equity begins and continues to vest. Together with the acceleration language your lawyer tucks a few pages back, those fields make up the vesting schedule, and they decide who owns your company four years from now.

Most founders set them once at formation and never revisit them. This guide covers how a vesting schedule works term by term, how founder, employee and advisor grants differ and what investors read into your terms during diligence.

What is an Equity Vesting Schedule

An equity vesting schedule consists of the vesting schedule terms in a grant agreement that determine when the shares or options in a person's grant become theirs to keep. People use "vesting schedule" and "vesting period" interchangeably. Only the period refers to total length, most commonly four years, and the schedule covers every term governing it: the commencement date, the cliff, the cadence and the acceleration provisions. A four-year period with a one-year cliff and monthly vesting is a different schedule from a four-year period with no cliff and annual vesting, even though both run 48 months.

Recipient type changes what "unvested" means on day one. A founder owns restricted shares at grant, subject to the company's repurchase right over the unvested portion, while option holders earn the right to exercise as their options vest. When someone leaves, shares that haven't vested stay subject to repurchase under the grant terms, and the company cancels unvested options.

How an Equity Vesting Schedule Works

A grant of 4,320 shares on a four-year schedule with a one-year cliff works in stages. Nothing vests for the first 12 months. At the first anniversary, 1,080 shares (a quarter of the grant) vest at once, and the remaining 3,240 vest at 90 shares a month for 36 months. Separate terms in the grant agreement produce each piece of that pattern, and none of them has to follow the default.

The Vesting Commencement Date

Boards set the commencement date, and it can fall earlier than the signature date on the grant. Approval and paperwork often lag the day a person starts working, so a board can set the commencement date to the real start date, not the day it signs. Founders use the same mechanism to get credit for time already served, and a founder who built the product for a year before incorporation can negotiate to have that year count.

The Cliff

The cliff is the waiting period before anything vests, and one year is standard at venture-backed startups. In the 4,320-share example, all 4,320 shares sit unvested through month 12, then 1,080 vest together at the anniversary. Companies use the cliff to keep short tenures off the cap table. Without one, a hire who leaves in month four still walks away owning part of the company.

The Vesting Cadence

Once the cliff passes, the rest of the grant vests on a fixed rhythm, and most startups run it monthly. Monthly vesting means a person who leaves in month 30 walks away with 30 months of equity, not a number rounded down to the last quarter or year. Quarterly vesting cuts the number of administrative events a lean finance team has to process, at the cost of up to a quarter's vesting for anyone who leaves mid-period.

The Acceleration Terms

Acceleration terms cover what happens to unvested equity when the company sells. Single-trigger acceleration vests everything the moment a change of control closes. Double-trigger acceleration requires the sale plus a termination without cause (or resignation for good reason) within a set window afterward, and the equity otherwise keeps vesting on its original schedule. Acquirers won't pay for a team that can walk the day the deal closes, which is what makes double trigger the market standard.

Types of Equity Vesting Schedules

What has to happen before equity releases separates one schedule type from another. Venture-backed startups almost always use time-based vesting, while the alternatives below show up in narrower situations:

• Time-based (graded) vesting: Equity vests purely on the passage of time, in monthly or quarterly increments after the cliff, and the 4,320-share example above follows this pattern.
• Milestone-based vesting: Equity vests when the recipient hits a defined target, such as a revenue number or a product launch. Companies use it for narrow engagements built around a single deliverable.
• Hybrid vesting: A time requirement and a milestone both apply. Private equity management incentive plans lean on this structure and often split a grant between time and performance conditions.
• Back-loaded vesting: Less equity vests in years one and two and more in years three and four. Retention improves because the largest tranches are furthest out, though candidates comparing offers usually notice the slower start.

Time-based graded vesting fits nearly every founder and employee grant at a venture-backed company, and the alternatives earn a place only when a specific deliverable or an unusual retention problem calls for one. Milestone and hybrid structures also cost more to run, since someone has to certify that the target was met before any equity moves.

How Vesting Schedules Differ for Founders, Employees and Advisors

Founders, employees and advisors all tend to get the same four-year, one-year-cliff shape. Underneath it, the instrument, the tax treatment and the negotiating room all change.

Founder Vesting

Founders generally receive restricted stock, not options, which is why founder vesting runs in reverse. You buy all your shares at formation for a nominal price, the company holds a repurchase right on the unvested portion and that right lapses as the schedule runs. If you leave early, the company can buy back your unvested shares at the price you paid, typically par value. Institutional investors expect this structure at the first priced round. Writing it into your co-founder equity split at formation leaves you with terms you chose and a commencement date that reflects the time you put in beforehand.

Employee Vesting

Employees commonly receive options from the pool, though some companies also use restricted stock units (RSUs) or restricted stock. Options give the employee a right to buy at a fixed price, not the stock itself. A board sets that price using a valuation, and an incentive stock option's exercise price cannot be below fair market value on the grant date. Nobody pays that price until they choose to exercise vested options. Leaving the company starts a post-termination exercise window, often 90 days, after which unexercised vested options expire.

Advisor Vesting

Advisor grants run on shorter schedules, commonly one to two years. The engagement usually ends well before a founder's or employee's tenure does. Many advisor agreements use monthly vesting with no cliff or a short one, so the equity tracks the months the advisor actually shows up. Companies size the grant to what the advisor is expected to contribute and match the vesting period to how long the engagement should last.

How to Set a Vesting Schedule for Your Startup

Drafting the equity plan and the founder stock purchase agreements forces a set of choices that founders often leave to the template. Each one has a market default and a reason you might move off it:

• Schedule length: Four years is the norm. A longer schedule holds people longer, but it makes your offer harder to sell against every company offering four, and a shorter one leaves you with fully vested employees who have nothing left to earn.
• Cliff length: One year is the default for founders and employees alike. A co-founder whose work predates incorporation sometimes negotiates a six-month cliff or none at all, on the reasoning that the trial period already happened.
• Cadence after the cliff: Monthly is the default. Annual vesting is rare enough at venture-backed startups that candidates comparing offers tend to read it as punitive.
• Credit for time already served: Prior work usually converts one for one, so a year of full-time building before a Series A leaves three years to run, not four. Getting this wrong costs a founder a year of ownership they already earned.
• Refresh grants: Retention value runs out the month a grant fully vests. Planning the next grant before that month arrives keeps the equity doing its job.

Plan documents carry the defaults, and every individual grant records the schedule length, commencement date, cliff, cadence and acceleration terms that apply to it. Any deviation from the default should have a reason you could explain to an investor two years later.

Vesting Schedule Mistakes That Cost Founders Equity

The expensive vesting mistakes share a pattern: each costs almost nothing to prevent at formation and a great deal to unwind once an investor spots it. They come up regularly in seed and Series A diligence.

Skipping Founder Vesting at Formation

Skipping founder vesting turns a departed co-founder into dead equity. Without a repurchase right, a co-founder who leaves at month six keeps a full stake, and it dilutes every person who stays through every round that follows. Investors price that stake as ownership doing no work, and cleaning it up later requires a signature on a buyback from someone who has no reason to give one.

Setting Vesting Commencement Dates Inconsistently

Offer letters, grant agreements and board consents all have to state the same commencement date. A start date agreed by email, or a verbal promise of acceleration, often never reaches the board approval records or the cap table system. Even a few weeks of mismatch changes the vesting calculation for anyone who leaves near a scheduled tranche, and diligence requires the grant agreements, board approvals and option ledger to reconcile before close.

Missing the 83(b) Election Window

Restricted stock subject to vesting comes with a filing deadline that has no extension. The Section 83(b) election lets a founder pay tax at grant on the shares' value, usually near zero, instead of at each vesting date at the then-current value. It has to reach the Internal Revenue Service (IRS) within 30 days of the transfer.

What Investors Look for in a Vesting Schedule

Investors read a vesting schedule for whether ownership tracks contribution and whether any equity belongs to someone who no longer works at the company. Founder vesting reads as the team's own decision that nobody walks away with a full stake for partial work, and its absence is the first thing an investor asks about. Commencement dates that don't reconcile across offer letters, board consents and grant agreements come next, since a cap table that doesn't tie out delays a clean close. Founder agreements that carry single-trigger acceleration get flagged too, because acquirers and later investors commonly press to convert them to double trigger before a deal closes.

Terms set before the first institutional round follow a company through every round after it. The founding team at CRV-backed Mercury formalized decision authority and equity structure before raising institutional capital. CRV led Mercury's Series A and participated in its Series B, C and D.

Setting an Equity Vesting Schedule That Holds Up

A commencement date, a cliff, a cadence and an acceleration provision are the whole of a vesting schedule. Together they decide whether the co-founder who leaves in year one keeps a full stake or none of it. Choosing them deliberately at formation, with credit for the time you've already put in, gets you to your first priced round with a cap table that needs no repair. Leaving them to the template fills the same fields with defaults drafted for someone else's company.

If you're an early stage founder looking for a lead investor who will work through founder vesting, commencement dates and acceleration terms with you before your first priced round, reach out to us to see if we'd be a good fit.

Frequently Asked Questions About Equity Vesting Schedules

What happens to unvested equity when someone leaves the company?

Unvested equity goes back to the company, and the price depends on the instrument. Restricted stock is repurchased at what the holder originally paid, usually a fraction of a cent, and options are cancelled with no payment at all. Vested options survive the departure, though the holder gets a post-termination window, usually 90 days, to pay the exercise price before they expire.

Can a company change a vesting schedule after making the grant?

Yes, a board can amend a schedule, and the holder has to consent when the change takes away an existing right, such as lengthening the schedule or cutting the share count. Accelerating vesting to a holder's benefit rarely creates a tax problem, and changes touching the exercise price or the post-termination exercise window need review first, because the IRS can treat those as a new grant.

What is the difference between vesting and exercising stock options?

Vesting earns you the right to buy shares; exercising is the act of buying them. You can only exercise options that have already vested, and exercising means paying the strike price the board fixed at grant to convert the option into actual shares.

Do restricted stock units and stock options use the same vesting schedule?

Both can use four-year time-based vesting with a one-year cliff, but private-company RSU plans often add a second condition: the company issues no shares until a liquidity event such as an initial public offering (IPO) or an acquisition. Time served alone never delivers the shares under that structure, which is why RSUs stay rare at seed and Series A companies and turn up mostly at companies approaching an exit.