TL;DR: Without a prenup, the growth in a business's value during a marriage is often treated as marital property, even when one spouse never worked there. As of December 2025, an estimated 16.63 million Americans were self-employed, per the U.S. Bureau of Labor Statistics (2025). A prenup lets a couple decide up front that the business stays separate, which can spare an owner a forced buyout or sale.
You poured years into building something. Late nights, missed weekends, the slow work of turning an idea into payroll and customers and a name people recognize. So the question of what happens to that business if a marriage ends is not abstract. It touches the thing you have worked hardest for.
The scale here is larger than most people assume. As of December 2025, an estimated 16.63 million Americans were self-employed, including both incorporated and unincorporated workers, according to the U.S. Bureau of Labor Statistics . Add the smallest businesses without paid employees and the number climbs: the U.S. Census Bureau counted roughly 29.8 million nonemployer businesses in its 2022 data, alongside about 8.3 million businesses that have paid employees. Business ownership is common, and for a huge share of these owners, the company is the single most valuable thing they hold. If you are one of them, this post walks through what default law does with a business in a divorce, and how a prenup changes the answer. For a broader view, our guide to navigating marriage as an entrepreneur is a useful companion read, and if you are still weighing whether this document is meant for someone in your position, who gets a prenup looks at the profiles that most often benefit.
Your business is more exposed than you think
Here is the part that catches owners off guard. A business you started, funded, and ran can still be pulled into a divorce, even if your spouse never set foot in the office. That happens because state property law does not care much about whose name is on the incorporation documents. It cares about how the business was funded, how it grew, and whether marital resources touched it during the marriage.
Consider a common pattern. A founder builds a software consultancy in her mid-twenties, marries at thirty-one, and keeps the company entirely in her name for the next decade. She never adds her spouse to the cap table. She assumes that arrangement settles the question. In a divorce, though, the court will look past the ownership records and ask what happened to the company during those ten married years: whether its revenue funded the household, whether her salary was set below market so profit could stay in the business, and how much of the company's growth traces back to work she did after the wedding. Each of those facts can pull value into the marital pool regardless of the name on the paperwork.
Without a prenup, the fate of your company gets decided by your state's default rules and, often, by a judge's discretion. Ownership stakes can become entangled in the proceedings. The result can be protracted negotiation, a court-ordered valuation, and difficult choices about how to settle. That process is slow and expensive, and it takes attention away from running the business at the exact moment the business needs you most. Our overview of what happens if you don't have a prenup covers this dynamic across asset types; for a business, the stakes tend to be higher because the asset is illiquid and tied to your livelihood. You cannot hand over half a company the way you might split a bank balance, which is why owners so often end up borrowing, selling, or negotiating under pressure.
Marital vs. separate property, and where businesses land
Every state sorts a couple's assets into two buckets when a marriage ends. Separate property generally belongs to one spouse alone, often things owned before the marriage or received individually by gift or inheritance. Marital property is generally what the couple built together during the marriage, and it is the pool that gets divided.
Which bucket your business falls into depends first on your state's framework. Business valuation and property division in the United States follow state-specific rules under one of two systems. In community property states, marital property is generally split 50/50; Texas, for example, applies a community property presumption to assets acquired during marriage under the Texas Family Code . In equitable distribution states, marital property is divided by fairness factors rather than a straight halving, and "equitable" does not always mean "equal." A judge weighs things like each spouse's contributions and circumstances, then divides in a way the court considers fair. Under New York's Domestic Relations Law §236, for instance, the court runs through a list of statutory factors before arriving at a distribution, which means two owners with nearly identical businesses can land in different places depending on the surrounding facts. Our explainer on community property vs. separate property breaks down which states use which system, and because the rules differ so much across state lines, how prenuptial agreements vary across America is worth a look if you have lived or done business in more than one state.
A business you owned outright before the wedding often starts as separate property. The complication is that it rarely stays perfectly sealed off. What happens during the marriage is where classification gets interesting.
The part that surprises owners: appreciation
Say you started your company two years before you got married, and over the next decade it tripled in value. That growth is where many owners get a surprise.
Courts often split business growth into two kinds. Passive appreciation is growth that came from outside forces, like a rising market or general economic conditions, without much effort from you. Active appreciation is the increase in a business's value that you caused through your own work, decisions, and reinvestment during the marriage. The distinction matters because, in many states, active appreciation is generally subject to division in a divorce while passive appreciation generally is not. So the original value of the business might stay separate, while the growth you drove during the marriage becomes part of the divisible marital pool, even if your spouse never worked a day there.
A quick contrast makes the line clearer. Imagine you owned a portfolio of rental properties before marriage and did little except collect rent while the regional market rose; much of that gain looks passive. Now imagine you spent the marriage adding units, renovating, renegotiating leases, and building a management team, and the portfolio's value climbed because of that hands-on work; that gain looks active. Most owner-operated businesses sit closer to the second example than the first, because a company usually grows through the founder's daily effort rather than by sitting untouched.
This is often the single most consequential concept for a founder to understand. If the business was small when you married and large when the marriage ended, and that increase came largely from your effort, a meaningful slice of today's value could be on the table under default rules. A prenup can address both types of growth and define how future appreciation is treated. For owners with layered finances, our guide to prenups for complex finances goes deeper on this, and high-income founders whose compensation and equity are tangled together may find a prenup for high earners a closer fit.
How courts value a business (and why goodwill matters)
If a business is going to be divided or bought out, someone has to put a number on it. That is where valuation comes in, and it is more art than arithmetic. Courts and the valuators they rely on use several approaches, looking at assets, income, and comparable sales, and the timing of the valuation itself can matter. California, for instance, addresses the valuation date for dividing a community estate in California Family Code §2552 . A valuation date that falls at a business's peak can produce a much different number than one set during a slow stretch, which is why the date is frequently contested.
One piece of value tends to generate the most disagreement: goodwill. Goodwill is the value of a business beyond its physical assets, the worth carried by reputation, customer loyalty, and brand. Courts often distinguish between two kinds. Enterprise goodwill is business value tied to the company itself, its brand, systems, and staff, rather than to any one person. Personal goodwill is value tied to you specifically, your skills, relationships, and reputation. According to the American Bar Association's Family Advocate, in a 2025 analysis of personal goodwill in divorce , enterprise goodwill is generally treated as a marital asset subject to division, while personal goodwill is often excluded, though treatment varies by state. For a service business built around one founder, that line can move a large number. A solo design studio or a consulting practice where clients hire you by name may carry most of its worth as personal goodwill, while a franchise or a product company with repeatable systems carries more enterprise goodwill. Which side of the line a valuator lands on can change the divisible figure substantially.
Commingling and buy-sell agreements: two quiet risks
Two things trip up owners more than almost anything else, and both tend to go unnoticed until a divorce forces the issue.
The first is commingling. A business started before marriage can lose its separate character over time when separate and marital money mix. Depositing business income into a joint checking account, using marital earnings to cover business expenses, or paying yourself in ways that blur the line can all erode the argument that the business is purely separate. Over years, that blurring can convert what began as separate property into something a court treats as partly marital. The business did not change hands; the paper trail did. The frustrating part is that these are ordinary decisions, made for convenience rather than for any legal reason. Running the household from the business account, or plowing a joint tax refund back into the company, feels efficient at the time. Years later, those same choices become the evidence a court uses to say the business stopped being separate.
The second is co-ownership. If you own a company with partners, a divorce can pull your ownership stake into court and unsettle everyone around you, from co-founders to investors to employees. A buy-sell agreement, the contract among owners that governs what happens when one owner's interest is affected by an event like death, exit, or divorce, is one common tool. A prenup and a buy-sell agreement work well together: the prenup keeps your interest classified as separate, and the buy-sell governs what happens to the stake itself. Without both, a co-founder could find that a partner's spouse has a claim to review the books, receive a payout, or, in the worst case, hold an interest in a company they never chose to join. Our guide to protecting a business partner with a prenup covers how these two documents reinforce each other. If part of your ownership sits inside a trust or a holding structure, how a prenup affects a trust is a related read worth having open.
What a prenup can do for your business
A prenup lets a couple decide, in advance and with full information, how a business will be treated if the marriage ends, instead of leaving that to your state's default rules. For a business owner, that usually means a few specific things.
It can designate the business as separate property and document that designation clearly, so its original character is confirmed rather than argued about later. Our explainer on the separate property clause in a prenup shows how this looks in practice. A prenup can define how future growth is treated, addressing the active-appreciation problem before it ever arises. It can allocate business-related debt, so a spouse is not exposed to liabilities they had no hand in, and it can also shield the household from business risk in the other direction, keeping a downturn in the company from reaching personal marital assets. And it can set expectations if a spouse works in or helps run the company, clarifying ownership and compensation up front so a paycheck does not quietly turn into an equity claim.
A prenup can also protect the people around you. By keeping your ownership interest separate and pairing it with a buy-sell agreement, you help keep an ownership dispute from spilling into the business and unsettling partners, investors, and employees. Framed this way, a prenup is a planning tool that protects your company and everyone who depends on it. A well-drafted prenup is designed to help you avoid a forced buyout, a sale of assets, or the awkward outcome of remaining co-owners with an ex. It is also more ordinary than many founders expect; the picture of who signs these agreements has widened well beyond the wealthy, as our roundup of prenup statistics shows.
Here is how the same business can be treated under default rules, and how a prenup can change each situation.
Situation
Likely default treatment
How a prenup can change it
Business started before marriage, untouched by marital funds
Original value often separate
Confirm and document as separate
Business grew due to owner's active efforts during marriage
Growth often marital and divisible
Define future growth as separate
Business income deposited into joint accounts
Risk of commingling; may become marital
Set rules keeping income separate
Spouse works in or helps manage the business
Strengthens a marital-property claim
Clarify ownership and compensation up front
Co-owned business with partners
Ownership stake can be drawn into divorce
Keep interest separate, pair with buy-sell
If you are weighing how to put an agreement together, our online prenup buyer's guide walks through what to look for and what a thorough document should cover for an owner.
Frequently asked questions
Is my business marital property if I started it before marriage?
The original business is often separate property, but it can lose that protection. Using marital funds to support it, involving your spouse in operations, or growth driven by your active efforts during the marriage can make part of its value divisible. A prenup can help keep the business and its growth classified as separate.
Can my spouse take half my business in a divorce?
It depends on your state and how the business was funded and grown. In community property states, marital property is generally split 50/50; in equitable distribution states, it is divided by fairness, and equitable does not always mean equal. A prenup lets you decide the outcome in advance instead of leaving it to default law.
What is active vs. passive appreciation?
Passive appreciation is growth from outside forces like market conditions. Active appreciation is growth you caused through your own effort, decisions, and investment. In many states, active appreciation is generally subject to division and passive appreciation generally is not. A prenup can address both.
Could I be forced to sell my business in a divorce?
It is possible. Without a clear agreement, an owner may have to buy out a spouse's interest, sell assets, take on debt, or remain co-owners with an ex. A prenup that designates the business as separate property is designed to help you avoid these outcomes.
Does a prenup protect my business partners?
It can help. If you co-own a company, a divorce can pull your ownership stake into court and unsettle partners and investors. A prenup that keeps your interest separate, often paired with a buy-sell agreement, helps keep ownership disputes from spilling into the business.
What is goodwill and does it get divided?
Goodwill is the value of a business beyond its physical assets, like reputation and customer loyalty. Courts often separate enterprise goodwill (tied to the business) from personal goodwill (tied to you). Treatment varies by state, and a prenup can address how business value is handled.
Getting started with First
If you own a business, a prenup lets you decide in advance how it is treated instead of leaving it to your state's default rules. First offers a modern, fully digital way to create one on your timeline. No PDFs, no hourly rates, no surprises. When you are ready, you can start with the Self-Serve package or explore the Lawyer Review and Bespoke packages for more complex ownership situations.
Business valuation and property classification vary by state and by the specific facts, so outcomes differ case by case. For a complex or co-owned business, it is worth consulting independent legal counsel and, where relevant, a qualified business valuator before you decide.
Methodology
These figures are drawn from U.S. government sources: the self-employment count is from the Bureau of Labor Statistics via the Current Population Survey (2025), and the business counts are from the U.S. Census Bureau's Nonemployer Statistics and County Business Patterns (2022 reference year). No original First data is used in this post.
Sources
First is not a law firm. The information and tools provided by First on this site are not legal advice and not a substitute for the advice of an attorney.
