The Informal Equity Split That Costs Founders Later
Plenty of founding teams still handle equity the same way: agree on a percentage split, maybe put it in an email or a simple cap table spreadsheet, and move on to building the product. It feels efficient early on. It becomes a serious liability the moment there is a tax deadline, a co-founder departure, or an institutional investor asking questions during a raise.
This article is for informational purposes only and does not constitute legal or investment advice. Reading this content does not create an attorney-client relationship.
The 83(b) Election: A 30-Day Window With No Exceptions
If you receive founder’s stock in the form of restricted stock a/k/a RSA you are eligible for an 83(b) election. This election allows you pay tax on the value of the stock now, while it is worth very little, instead of paying tax later as each tranche vests and the company’s value has grown substantially. When you receive an RSA the IRS gives you a strict window to file a Section 83(b) election: 30 days from the date the stock is issued.
Miss the 30-day window, and there is no extension, no exception, and no way to file late. Founders who miss it can end up owing tax on the increasing value of their stock as it vests, sometimes a significant and entirely avoidable tax burden on stock they have not sold and cannot easily liquidate to cover the bill.
This section and all content below offers general information only and is not legal, tax, or investment advice. Outcomes depend on individual facts and circumstances, and you should consult qualified counsel for guidance specific to your situation.
The Cost of Getting This Wrong
We have worked with a founder facing a substantial and completely avoidable tax liability on unvested paper stock, all because the 30-day 83(b) filing deadline was missed following incorporation. There was no way to correct it after the fact. The deadline had passed, and the tax bill followed.
Vesting Schedules and Trigger Provisions
A standard vesting schedule protects the company and remaining founders if someone leaves early. But the details of how acceleration works matter just as much as whether vesting exists at all. Single-trigger acceleration vests a founder’s remaining shares immediately upon an acquisition. Double-trigger acceleration requires both an acquisition and a qualifying termination before shares accelerate.
Institutional VC funds generally push back hard on single-trigger provisions because they can make a company less attractive to acquire, a key founder’s equity fully vests and their incentive to stay through integration disappears the moment the deal closes. Double-trigger structures are far more common in venture-backed companies for this reason.
Governance choices depend on facts and circumstances and should be evaluated with experienced corporate counsel. No particular structure is suitable for all companies.
Handling a Co-Founder Departure Without Losing Control
When a co-founder leaves early, unvested shares should return to the company under a properly drafted restricted stock agreement. Without that mechanism in place, a departing co-founder can walk away holding a meaningful equity stake in a company they no longer work for, sometimes called dead equity, which sits on the cap table and complicates every future raise.
This is not a hypothetical risk. It is one of the most common reasons a Series A raise stalls, when a new investor’s diligence team finds a former co-founder holding equity with no ongoing involvement, and no clean mechanism for resolving it.
Repurchase Rights: Reclaiming Vested Equity
Unvested shares are the easy case, since they revert automatically under the restricted stock agreement. Vested equity is trickier, which is why founder agreements should also include a company right of redemption or repurchase over a departing founder’s vested shares, not just the unvested portion. Absent that right, a founder who leaves after meaningful vesting keeps a permanent stake regardless of tenure, dilution to later hires, or how the company’s needs evolve. That’s leverage that has nothing to do with future contribution. A well-drafted repurchase provision fixes the triggering events (resignation, termination for cause, sometimes any voluntary departure), sets a defensible price (fair market value, a formulated price, or original cost depending on the trigger), and gives the company a window to exercise before the shares are treated as permanently outside its control. Building this in at formation, while all founders are still aligned, is far easier than negotiating it after a departure has already happened. It’s exactly the kind of provision an investor’s diligence team will check for before a priced round closes.
The Bottom Line
Founder equity architecture is not a paperwork formality you handle once and forget. It is the structure that determines whether your cap table stays clean through a Series A, whether a co-founder departure is a minor adjustment or a major complication, and whether you owe tax you never needed to owe.
Faison Law Group structures founder equity, vesting, and 83(b) elections correctly from day one. If you are incorporating, bringing on a co-founder, or cleaning up an existing cap table, book a call.
Frequently Asked Questions About Founder Equity
The following FAQ addresses common, practical questions founders and business owners ask about corporate governance documents and working with a governance-focused transactional lawyer. Answers are general and educational-not legal advice for any specific company or situation. Consult counsel for tailored guidance.
What is an 83(b) election?
It’s a filing that lets you pay tax on founder stock at today’s low value instead of paying tax later as each tranche vests at a higher valuation. You have 30 days from the date the stock is issued to file it.
What happens if I miss the 83(b) deadline?
There’s no extension and no way to file late. You can end up owing tax on the increasing value of stock you haven’t sold and can’t easily liquidate to cover the bill.
What’s the difference between single-trigger and double-trigger acceleration?
Single-trigger vests a founder’s remaining shares immediately upon an acquisition. Double-trigger requires both an acquisition and a qualifying termination. Investors generally prefer double-trigger because it keeps key people incentivized through integration.
What happens to a co-founder’s shares if they leave early?
Under a properly drafted restricted stock agreement, their unvested shares return to the company. Without that agreement, a departing co-founder can keep a meaningful stake in a company they no longer work for.
Why does dead equity matter for fundraising?
It’s one of the most common reasons a Series A stalls. When a diligence team finds a former co-founder still holding equity with no ongoing involvement, it raises questions that slow the raise down.