Your vesting schedule wasn't designed for this scenario.

Vesting schedules are built for one thing: ensuring founders earn their equity over time. They handle the "cofounder quits at month six" scenario elegantly. They handle the "cofounder gets fired for cause" scenario reasonably well.

They handle the "cofounder dies at month eighteen" scenario terribly.

When a founder with a vesting schedule dies, three separate legal frameworks collide: the vesting agreement itself, state estate law, and the company's bylaws and shareholder agreements. The result is a mess of competing obligations that can freeze your cap table, pit the company against a grieving family, and create disputes that take years to resolve.

This is how it actually works — and how to structure things so it doesn't become a catastrophe.

What happens to unvested shares when a founder dies

The first question everyone asks: do the unvested shares vest or not? The answer depends entirely on what your vesting agreement says — and most vesting agreements don't say nearly enough.

The default rule: unvested shares are forfeited

Unless your vesting agreement explicitly addresses death, the default treatment in most standard startup equity documents is that unvested shares are simply forfeited. The founder hasn't "earned" them yet under the terms of the agreement, so they return to the company's equity pool.

This might sound clean from the company's perspective. It's not. The deceased founder's family will almost certainly argue that death shouldn't be treated the same as voluntary departure — and they have a reasonable moral argument even if the legal one is less clear. The result is a dispute between the company and a grieving family, fought in public, with your employees and investors watching.

4 years
standard vesting period — meaning a founder who dies at year two has half their equity in legal limbo

Single-trigger acceleration

Some vesting agreements include a single-trigger acceleration clause for death. This means: if the founder dies, all unvested shares immediately vest. Full stop. The estate receives the founder's entire equity allocation regardless of how long they actually worked.

Single-trigger acceleration is the most founder-friendly approach. It ensures the founder's family receives the full value of the equity that was originally promised. But it can create problems for the company and remaining founders:

  • The deceased founder's estate now holds a large equity position — potentially 30-50% of the company
  • The heirs become shareholders with voting rights and information rights
  • The remaining founders, who now carry 100% of the work, may feel the cap table no longer reflects who's actually building the company
  • Investors may push back on a large equity block held by passive heirs

Double-trigger acceleration

Double-trigger acceleration requires two events before unvested shares accelerate. Typically, the first trigger is death or disability, and the second trigger is a change of control (acquisition) or a failure by the company to buy back the shares within a specified period.

In practice, double-trigger clauses for death are less common than for other departure scenarios. They add complexity without clearly benefiting either side. Most founders and their attorneys opt for either full acceleration on death or no acceleration — the middle ground creates more ambiguity than it resolves.

Partial acceleration

A compromise approach: the vesting agreement specifies that a certain percentage of unvested shares accelerate on death. Common structures include:

  • 12 months of additional vesting credited at death
  • 50% of remaining unvested shares accelerate
  • Acceleration to the next annual vesting cliff

Partial acceleration balances the founder's family's interest in fair compensation with the company's need to maintain a workable cap table. It's increasingly the approach recommended by startup attorneys who've seen the alternatives play out badly.

What happens to vested shares when a founder dies

Vested shares are simpler in principle but messier in practice. The founder earned them. They're an asset. When the founder dies, those shares transfer to their estate like any other property.

If the founder had a will

The shares go to whoever the will specifies — usually a spouse, sometimes children, occasionally a trust. That person (or entity) becomes a shareholder in your company with all the rights that implies.

If the founder didn't have a will

State intestacy law determines who inherits. In most states, a surviving spouse gets everything or nearly everything. Without a spouse, shares pass to children, then parents, then siblings. The shares could end up split among multiple heirs — each of whom is now a shareholder in your startup.

The cap table nightmare

Your cofounder dies without a will. They were two years into a four-year vest, so 50% of their shares are vested. Single-trigger acceleration in the vesting agreement vests the remaining 50%. State law transfers all shares to the cofounder's estranged spouse and two children from a previous relationship.

You now have three new shareholders — none of whom you've ever met — who collectively own 40% of your company. The spouse wants to sell the shares immediately. One child is a minor represented by a guardian ad litem. The other child lives overseas and is unreachable. Your Series A investor is calling an emergency board meeting.

This situation takes 18-24 months and $200K+ in legal fees to resolve. The company nearly dies in the process.

How buy-sell agreements fix the equity problem

A buy-sell agreement is the mechanism that prevents the nightmare scenario above. It's a legally binding contract between founders (and sometimes the company itself) that predetermines what happens to equity when a founder dies.

The cross-purchase structure

In a cross-purchase buy-sell, the surviving founders agree to buy the deceased founder's shares — both vested and any that accelerate on death. The price is determined by a valuation method agreed upon in advance (typically the most recent 409A valuation, a formula based on revenue multiples, or a third-party appraisal triggered by the event).

This is clean because it keeps the transaction between the founders. The company itself isn't involved. The surviving founders' ownership increases proportionally, and the deceased founder's family receives cash instead of illiquid startup equity.

The redemption structure

In a redemption buy-sell, the company itself buys back the deceased founder's shares. The shares are retired or returned to the equity pool. The surviving founders' percentage ownership increases automatically because the total share count decreases.

Redemptions work better for multi-founder companies where no single surviving founder could afford the buyout individually. The company uses insurance proceeds (more on this below) to fund the purchase.

The critical piece: funding the buyout

A buy-sell agreement without funding is a promise to pay money that doesn't exist. If your deceased cofounder's shares are worth $2M based on the last 409A, where does $2M come from?

Key man insurance is the answer. The company (or the surviving founders, depending on the structure) takes out life insurance on each founder. When a founder dies, the insurance pays out the cash needed to buy the shares. The buy-sell agreement triggers the obligation. The insurance funds it.

$50-80/mo
typical cost of $1M in key man coverage for a healthy founder under 40 — less than your team's coffee budget

The family equity problem

Here's the tension that most founders don't think about until it's too late: the deceased founder's family has legitimate financial interests that directly conflict with the company's operational interests.

The family's perspective

The founder spent years building this company. They sacrificed salary, took risk, and poured their life into it. The equity they earned represents real value — value their family is counting on. The family wants either:

  • Cash for the shares at fair market value, or
  • To retain the shares and benefit from the company's future success

The company's perspective

The remaining founders are now doing 100% of the work. Having a large equity block held by passive heirs creates governance complications, makes future fundraising harder, and feels fundamentally unfair to the people still building the company. The company wants:

  • To buy back the shares and clean up the cap table, or
  • At minimum, to ensure the heirs can't block critical company decisions

The solution: structure it in advance

The only way both sides get a fair outcome is if the terms are negotiated before anyone dies — when everyone is rational, unemotional, and focused on fairness rather than self-preservation.

This means:

  • A vesting agreement with explicit death provisions (acceleration terms everyone agrees to)
  • A buy-sell agreement with a pre-agreed valuation methodology
  • Insurance funding so the buyout can actually happen
  • Clear timelines — the buyout completes within 90 days, not 18 months

The protected scenario

Your cofounder dies two years into their vest. The vesting agreement credits 12 months of additional vesting, bringing their total vested shares to 75% of their allocation. The buy-sell agreement triggers a company redemption at the current 409A valuation of $1.8M for those shares.

Key man insurance pays $2M to the company within 30 days. The company buys back the shares and delivers $1.8M to the founder's estate. The remaining $200K covers legal costs and operational transition. The founder's family receives fair cash value. The cap table is clean. The company moves forward.

Everyone agreed to these terms two years ago, when everyone was alive and thinking clearly. That 30-minute conversation saved the company.

Structuring vesting to protect both sides

Based on how these situations actually play out, here's what startup attorneys increasingly recommend:

Include explicit death provisions in every vesting agreement

Don't rely on defaults. Spell out exactly what happens to unvested shares on death. Ambiguity in this clause costs $100K+ in legal fees every time.

Use partial acceleration, not full

Credit 12 months of additional vesting on death. This gives the family meaningful additional equity beyond what was already vested, without handing over shares the founder hadn't earned yet. It's the fairest balance between honoring the founder's contribution and protecting the company.

Pair every vesting agreement with a buy-sell

Vesting determines how much equity the estate gets. The buy-sell agreement determines what happens to that equity — specifically, that the company or surviving founders will buy it at a fair price. Without both documents, you have half a solution.

Fund the buy-sell with insurance

The buy-sell only works if the buyer has cash. Key man insurance provides that cash at exactly the moment it's needed. Match the coverage amount to the likely buyout obligation based on your cap table and current valuation.

Review annually

Your cap table changes. Your valuation changes. Your vesting milestones pass. Review the buy-sell agreement and insurance coverage at least once a year — ideally tied to your annual 409A valuation — to make sure the numbers still work.

Don't wait until someone dies to figure this out

The intersection of vesting, death, and equity is one of those problems that feels theoretical until it isn't. Every founder thinks they'll deal with it eventually. The ones who actually do it are the ones whose companies survive.

If you haven't addressed death in your vesting agreements, or if you have vesting agreements without a funded buy-sell, you have a gap in your founder protection that could destroy the company.

Book a 15-minute call to review your current vesting structure and get a recommendation for the right combination of vesting provisions, buy-sell terms, and insurance coverage. We work with startup founders and their attorneys to get these documents right — before they're needed.

Coverage subject to underwriting approval. Insurance products vary by state. Consult your tax and legal advisors for situation-specific guidance.