The Equity Problem Most Prenups Do Not Solve
For tech employees, startup founders, and corporate executives, equity compensation is often the most valuable financial asset in the picture. It is also, in the prenuptial agreement context, one of the most consistently mishandled. Stock options and restricted stock units that have not yet vested at the time of marriage sit in a legally ambiguous space that generic prenup templates almost never address correctly, and the consequences of that failure can be financially devastating when a marriage ends.
The fundamental problem is timing. Equity that is granted before a marriage but vests during the marriage does not fit neatly into either the separate property or marital property category. It was earned, in one sense, before the marriage began. But the vesting, which is the moment when the equity actually becomes the employee’s to exercise or sell, happens during the marriage. Under Florida’s equitable distribution framework, the portion of that equity attributable to marital effort is subject to division. Pinning down exactly what portion that is, and how a prenuptial agreement should address it, requires an understanding of both Florida family law and the mechanics of equity compensation that most off-the-shelf prenup templates simply do not have.
This piece walks through the characterization problem in detail, explains why it matters so much for couples in the tech, startup, and executive world, and describes what a properly drafted prenuptial agreement addressing unvested equity actually looks like.
How Equity Compensation Works and Why Timing Matters
Before getting into the legal analysis, it is worth establishing a baseline understanding of how stock options and RSUs work, because the legal analysis tracks the economic mechanics closely.
Stock Options
A stock option is a right to purchase shares of company stock at a specified price, called the strike price or exercise price, at some point in the future. Options are typically subject to a vesting schedule, which means the employee earns the right to exercise them incrementally over time. A common structure is a four-year vest with a one-year cliff, meaning no options vest until the employee has been with the company for one year, at which point 25% vest, with the remainder vesting monthly or quarterly over the following three years.
Options that have vested can be exercised at the employee’s election, subject to any company-imposed exercise windows. Options that have not yet vested cannot be exercised and may be forfeited if employment ends before the vesting date.
Restricted Stock Units
RSUs are a different but related instrument. Rather than granting a right to purchase shares at a fixed price, an RSU is a promise to deliver shares when the vesting conditions are met. RSUs are typically subject to time-based vesting schedules similar to options, though performance-based vesting tied to company or individual milestones is also common.
When RSUs vest, the shares are delivered to the employee, and the value of those shares at vesting is treated as ordinary income for tax purposes. Unlike options, RSUs always have value as long as the underlying stock has value, because the employee receives shares rather than purchasing them at a fixed price.
Why the Timing Creates a Legal Problem
Equity compensation is explicitly tied to continued employment. The whole point of a vesting schedule is to incentivize the employee to remain with the company over the vesting period. This creates a characterization problem that courts and family law practitioners have wrestled with across jurisdictions: if the equity was granted in recognition of past service but vests because of future service rendered during the marriage, what portion of it is attributable to the marriage?
Florida’s equitable distribution statute provides that marital assets are assets acquired during the marriage. Income and assets acquired during the marriage using marital effort are generally marital in character. This framework does not map cleanly onto unvested equity, and the result is a genuinely contested area of law where the outcome can depend on how the specific facts are characterized and argued.
How Florida Courts Approach the Characterization of Unvested Equity
Florida courts have developed approaches to unvested equity characterization in the divorce context, though the case law continues to evolve. The dominant analytical tool is a time-based proration formula that attempts to allocate equity between the pre-marital and marital periods based on when the equity was granted and when it vested.
The Coverture Fraction
The most common approach uses what is sometimes called the coverture fraction, a concept borrowed from cases involving defined benefit pension plans. The basic idea is to determine what portion of the vesting period fell within the marriage and treat that proportion of the equity as marital.
For example, if an option grant has a four-year vesting schedule that began two years before the marriage, and the couple divorces two years after the wedding when all options have vested, the fraction of the vesting period that fell within the marriage is two out of four years, or 50%. Under this approach, approximately half of those options would be characterized as marital property.
The math sounds straightforward, but the application is frequently contested. Questions arise about which date to use as the grant date, how to handle re-grants or refresher grants, what to do with accelerated vesting triggered by a corporate event, and how to value options that vest during the marriage but are exercised after the divorce.
The Grant Date Approach
Some arguments favor characterizing equity based on the conditions that existed at the time of grant rather than using a vesting-period proration. Under this view, if the grant was made before the marriage in recognition of pre-marital employment, it should be treated as separate property regardless of when vesting occurs. This approach tends to favor the employee spouse and has support in some jurisdictions, but it is not uniformly accepted in Florida.
Why Prenuptial Agreements Matter So Much Here
The legal uncertainty around unvested equity characterization is precisely why a well-drafted prenuptial agreement is so valuable for couples where one or both parties hold significant equity compensation. Rather than leaving the characterization question to a court applying contested equitable principles, the parties can specify exactly how their equity will be treated in the event of divorce. A prenup can define which grants are separate property, how vesting-period proration will or will not apply, and what methodology will be used to value and allocate equity that straddles the pre-marital and marital periods.
Without a prenup, the litigation risk around unvested equity is substantial. With a properly drafted prenup, it is largely eliminated.
What Generic Prenup Templates Get Wrong
The prenuptial agreement templates that circulate online, and even some drafted by attorneys without specific expertise in equity compensation, typically fail in predictable ways when it comes to unvested stock.
Treating All Pre-Marital Property as Separate Without Qualification
The most common error is language that characterizes all property owned at the time of marriage as separate property of the owning spouse, full stop. This language sounds comprehensive, but it does not address what happens when property that exists at the time of marriage but is not fully realized until after the marriage. An unvested stock option technically exists at the time of marriage, in the sense that the grant has been made. But the value of that option, and the employee’s right to realize it, depends on future vesting that requires continued employment during the marriage.
A court asked to interpret a generic separate property clause in the context of unvested equity will face a genuine ambiguity. The clause says pre-marital property is separate. The equity was granted before the marriage. But the equity vested during the marriage using marital labor. The clause does not resolve that tension, and the court will have to apply equitable principles to fill the gap, which is exactly what the parties were trying to avoid by having a prenup in the first place.
Failing to Address Future Grants
Many prenup templates address only the property each party owns at the time of signing. They do not address equity that will be granted in the future, whether at the current employer or a new one. For a tech executive or startup employee, future equity grants may dwarf the value of current grants. An agreement that does not address how future grants will be characterized leaves a major category of assets completely outside the prenup’s protective framework.
Ignoring the Tax Dimension
Equity compensation has significant tax consequences that a prenuptial agreement should acknowledge. When RSUs vest, the shares are taxable as ordinary income. When options are exercised, the tax treatment depends on whether they are incentive stock options or non-qualified stock options, and when the resulting shares are sold. A prenup that characterizes certain equity as separate property without addressing how the associated tax liability is allocated can create a situation where one spouse receives the economic benefit of the equity while the other bears a disproportionate share of the tax burden.
No Methodology for Valuing Unvested Equity at Divorce
Even if a prenup correctly identifies which equity is separate and which is marital, it needs to provide a framework for valuing that equity at the time of divorce. For public company stock, this is relatively straightforward. For startup equity, it can be enormously complex. A prenup that says “unvested options shall remain the separate property of the employee spouse” without addressing how those options will be valued at divorce, or what happens if the company is acquired before the divorce is final, leaves critical questions unanswered.
What a Properly Drafted Prenup Should Include
For couples where equity compensation is a significant part of the financial picture, a properly drafted prenuptial agreement addressing unvested stock should include several specific elements.
A Comprehensive Definition of Equity Compensation
The agreement should define what it means by equity compensation broadly enough to capture all relevant instruments: stock options of all types, RSUs, restricted stock awards, performance share units, stock appreciation rights, phantom stock, and any other equity-linked compensation the employee spouse may receive. A narrow definition risks leaving some instruments unaddressed.
Explicit Characterization of Pre-Marital Grants
The agreement should address the specific grants that exist at the time of signing, identifying them with enough specificity to be unambiguous: the employer, the type of instrument, the grant date, the number of units or options granted, the vesting schedule, and the strike price where applicable. It should then specify clearly how those grants are characterized for equitable distribution purposes, including what happens to equity that vests during the marriage.
A Proration Framework or a Rejection of Proration
The parties should make an explicit decision about how to handle equity that vests during the marriage and document that decision in the agreement. Options include treating all pre-marital grants as entirely separate property regardless of when vesting occurs, applying a specific proration formula agreed to by the parties, or treating the marital-period vesting as marital but specifying how that marital interest will be calculated and valued.
Whatever approach the parties choose, it should be explicit rather than left to default rules. A Florida alimony attorney or family law practitioner helping draft this provision should model out what the chosen approach would mean across a range of divorce scenarios before the parties commit to it.
Treatment of Future Grants
The agreement should address how equity grants made during the marriage will be characterized. If both parties agree that equity earned during the marriage from marital-period employment is marital property, that should be stated. If the employee spouse wants future grants to be treated as separate property despite being granted during the marriage, that requires explicit contractual language and will be a significant negotiating point.
Accelerated Vesting Scenarios
Many equity compensation arrangements include provisions for accelerated vesting upon a change of control, a termination without cause, or other specified events. A prenuptial agreement addressing equity should contemplate these scenarios. If acceleration occurs during the marriage and a large block of previously unvested equity vests all at once, the characterization of that equity under the prenup should be clear.
Valuation Methodology
For startup equity in particular, the agreement should address how unvested or illiquid equity will be valued at the time of divorce. Options include using a most recent 409A valuation, agreeing to an independent appraisal process, or specifying that certain illiquid equity will be distributed in kind rather than cashed out. The methodology should be specified in the agreement rather than left to post-divorce negotiation.
Tax Allocation
The agreement should address how the tax consequences of equity compensation will be allocated between the parties, particularly where equity is characterized as separate property of one spouse but generates tax liability that would otherwise be shared.
The Alimony Dimension for High-Equity Earners
For executives and tech professionals whose compensation is heavily weighted toward equity, the characterization of unvested stock in a prenup has direct implications for alimony as well as property division. Florida’s alimony framework, restructured by SB 1416, requires courts to consider each party’s financial resources when determining whether alimony is appropriate and in what amount. Equity compensation that vests during the marriage is part of the financial picture.
A prenuptial agreement that successfully characterizes a large block of equity as separate property of the employee spouse effectively shields that wealth from the equitable distribution analysis. But it does not automatically shield it from the alimony analysis, because alimony under Florida law looks at the payor’s ability to pay, which may include income derived from separate property assets.
For a Tampa alimony lawyer advising a tech executive or startup employee, this means the prenup needs to address both property division and alimony specifically, and the two sets of provisions need to be internally consistent. A prenup that protects unvested equity as separate property while also limiting alimony is a coherent strategy. A prenup that protects the equity but fails to address the alimony implications of that equity wealth may leave the client with incomplete protection.
Practical Scenarios Where This Plays Out
The Startup Employee Who Joins a Unicorn
An employee joins a startup two years before marriage with a four-year vesting schedule on a large option grant. The company is acquired for a significant premium two years into the marriage, accelerating vesting on all remaining options. The employee receives a substantial payout. How much of that payout is marital?
Without a prenup, a Florida court would likely apply a proration analysis, treating the portion of the vesting period that fell within the marriage as marital. With a well-drafted prenup that addresses accelerated vesting scenarios and specifies that all pre-marital grants are separate property regardless of when vesting occurs, the employee spouse has a strong contractual argument that the entire payout is separate. The difference in outcome can be millions of dollars.
The Corporate Executive With Annual Refresher Grants
A senior executive at a public company receives annual equity refresher grants as part of a total compensation package. At the time of marriage, they hold multiple overlapping grant tranches at different stages of vesting. New grants will be made every year during the marriage as part of their ongoing compensation.
This scenario requires a prenup that addresses both the existing grants and the future annual grants with precision. A Florida alimony attorney or family law practitioner helping draft this agreement needs to understand the specific equity plan documents well enough to translate their mechanics into enforceable prenup language.
The Founder With Founder’s Stock
A startup founder who owns founder’s stock subject to reverse vesting, a structure common in venture-backed companies, faces a unique version of the characterization problem. Founder’s stock is typically issued at formation at a nominal price but subject to repurchase by the company if the founder leaves before a specified date. Economically, this functions like a vesting schedule for equity already issued. A prenuptial agreement should address how reverse-vesting founder’s stock is treated if the marriage ends before the repurchase restrictions lapse.
FAQ
If my stock options were granted before we got married, are they automatically separate property in Florida?
Not necessarily, and this is the core misconception that causes the most problems. Options granted before the marriage may be separate property in origin, but the portion that vests during the marriage because of continued marital-period employment is subject to equitable distribution arguments under Florida law. Courts have applied proration formulas that allocate part of pre-marital grants to the marital estate. A prenuptial agreement that explicitly addresses this characterization is the only reliable way to control the outcome rather than leaving it to judicial discretion.
Can a prenup protect RSUs that haven’t vested yet even though they weren’t in my name at the time of signing?
Yes. A prenuptial agreement can address not just property currently in your name but also future interests and contingent rights, including unvested RSUs. The key is that the agreement must describe the equity with enough specificity to cover the relevant grants, and it must address what happens when those RSUs vest during the marriage. The agreement should also address future grants so that RSUs awarded after the wedding are handled consistently with your overall intent.
What happens to unvested stock options if we divorce before they vest?
This depends on your equity plan documents and, if you have a prenup, on the specific terms of that agreement. Under most equity plans, unvested options are forfeited if employment ends. If the divorce itself does not end the employment, the unvested options may remain outstanding subject to the vesting schedule. A prenuptial agreement should address how unvested equity is handled at divorce, including whether the non-employee spouse has any claim to options that vest after the divorce is finalized. Without a prenup, a Florida court may award the non-employee spouse a percentage of options that vest post-divorce if those options are attributable to marital-period employment.
Should my prenup address equity at my current employer only, or future employers too?
It should address both. Future equity grants, whether at your current employer or a new one, can represent substantial wealth, and a prenup that only addresses current holdings leaves future grants unprotected. The agreement should include language that covers all equity compensation received from any employer during the marriage and specifies clearly how that compensation is characterized. This is especially important for employees in industries where job changes and new equity packages are common.
How do we value unvested startup equity in a prenup when there is no public market for the shares?
This is one of the harder practical problems in drafting prenups for startup employees. The agreement should specify a valuation methodology in advance rather than leaving it to dispute at divorce. Common approaches include using the most recent 409A independent appraisal of the company’s common stock, agreeing to a new independent appraisal at the time of divorce, or specifying that illiquid startup equity will be distributed in kind rather than converted to a cash equivalent. Each approach has tradeoffs, and a Florida family law attorney with experience in equity compensation cases can help you think through which methodology best fits your specific situation.
Does a prenup protecting my equity also protect me from alimony claims based on that equity?
A prenup that characterizes equity as separate property removes it from the equitable distribution analysis, but alimony is a separate question. Florida courts considering alimony look at both parties’ financial resources, and separate property assets, including equity, are part of the financial picture used to assess ability to pay. A prenup that limits alimony exposure needs to do so with specific alimony provisions, not just property characterization language. Working with an alimony lawyer in Tampa who understands how equity wealth interacts with alimony calculations under Florida’s current statute is essential to making sure both pieces of protection are in place.
Written by Damien McKinney, Founding Partner
Damien McKinney is the Founding Partner of The McKinney Law Group Family & Divorce Lawyers, bringing nearly two decades of experience to complex marital and family law matters. He is licensed in both Florida and North Carolina and has been repeatedly recognized as a Rising Star by Super Lawyers.