Partnerships in business are built on trust, shared ambition, and often years of hard work and personal sacrifice. But even the most durable business relationships can be unexpectedly strained by events in a partner’s personal life, most notably marriage or divorce. When your co-founder or business partner gets married, their personal legal and financial decisions don’t exist in a vacuum. A marriage brings new legal relationships, property rights, and potential claims that can ripple through the business itself. For that reason, many prudent business owners, especially those in closely held companies or startups, quietly ask themselves: Should I encourage my business partner to get a prenup or postnup? It might at first feel like you’re overstepping into a personal area. But as any experienced family or corporate lawyer will tell you, you might have a lot to lose if a divorce transpires, so it’s therefore a smart conversation to have with your business partner. Prenuptial and postnuptial agreements are powerful tools to protect a business.

Why your partner’s personal agreements affect your company

When one partner’s marriage ends in divorce, the fallout can quickly extend into the boardroom. In community property and equitable distribution states, a spouse can claim an ownership interest in marital property, including, in many cases, the value of a business interest acquired or grown during the marriage. Even if the non-partner spouse never set foot in the office, they may still assert a right to a share of the business, its profits, or appreciation in value. This can be devastating for a small or private company. 

Divorce proceedings often lead to forced valuations, ownership transfers, or buyouts that disrupt stability. A business partner’s ex-spouse could even become a shareholder, entitled to financial disclosures or decision-making rights. These risks are especially relevant in states like California, Washington, or Texas, where community property laws can treat a business started or expanded during marriage as joint property. Even outside community property states, equitable distribution laws may entitle the spouse to a portion of the business’s increased value during the marriage if that growth was tied to marital labor or income. In other words, if your partner built the company while married, their personal divorce could suddenly become your business problem.

The case for encouraging a prenup or postnup

A well-drafted prenuptial or postnuptial agreement can act as a firewall between personal and business assets. It clarifies which assets belong solely to the business partner, how appreciation will be handled, and what happens to those assets in the event of divorce or death. For you, as the co-founder, that clarity matters enormously. A prenup can prevent an ownership stake in your company from being treated as marital property in the first place, thereby protecting your business from unexpected third-party claims. And a postnup, which is signed after the marriage, can serve as a course correction for partners who didn’t plan ahead but now recognize the risk.

As uncomfortable as it might sound, encouraging your partner to pursue one of these agreements is not overstepping. It’s protecting the shared enterprise you’ve both invested in. The conversation is best framed around continuity, not control. The goal is to ensure business stability regardless of personal change. And be prepared for your business partner to expect the same contractual obligations from you. A balanced partnership, in business as well as in marriage, should prioritize protecting your partner from the negative fallout of your personal situation.

How to approach the conversation

Bringing up a prenup or postnup with your partner can feel personal and intrusive, but how you frame the discussion matters. It helps to keep the focus on the business, not the marriage. You might say, “Our business is growing, and we’ve worked too hard to let personal circumstances, yours or mine, jeopardize it. Have you thought about protecting your ownership stake with a prenup or postnup?” It might also help to educate your business partner on the real risks involved in divorces, such as an ex-spouse forcing a buyout or receiving control and voting rights. This should open the eyes of someone who has possibly never considered the overlap between business and personal life.

The right talking points can reframe the topic as a form of responsible governance rather than emotional suspicion. You can also cite investor expectations. Many venture capital and private equity firms quietly require founders to have marital agreements or buy-sell protections in place before funding, precisely to avoid ownership complications if a founder divorces. To further depersonalize the issue, some partnerships address it directly in their operating agreement or shareholder agreement. These agreements can require all owners to execute a marital agreement that protects the company’s continuity. This ensures consistency across all partners and avoids singling anyone out.

How prenups and postnups protect business interests

A well-drafted agreement can do several things to protect both the founder and the company:

Clearly define separate property

First, it can clearly define separate property, establishing that the ownership interest in the company, whether acquired before marriage or with separate funds, remains that partner’s separate property. This helps ensure that the business itself does not become part of any marital estate subject to division. Including clear language about how a business will be classified in a future divorce is also a kindness to a future or current spouse. This sets expectations in a transparent, unambiguous way.

Address appreciation and growth

Second, a marital agreement can address appreciation and growth, distinguishing between passive appreciation, due to market forces or outside investment, and active appreciation due to the partner’s own efforts during marriage. Without this distinction, courts may include the increase in value as marital property. This added detail also provides clear and uncertain guardrails regarding your business and make the prenup harder to successfully contest in the future.

Waive claims to company

Third, the agreement can waive claims to the company or its proceeds, ensuring that even if marital funds indirectly supported the business, the spouse will not claim ownership. When clauses such as this are put into an prenup or postnup, it’s essential that the non-business spouse is aware of the consequences. If the non-business partner contributed to a separate property business with the expectation that they would earn equity or ownership in the business, this could lead to confusion and litigation in the future. If you’re a party to a marital agreement, make sure you and your partner are aligned on its terms prior to sining. And, if your business partner is the one entering the agreement, this is helpful advice to share.

Clarify buyouts and compensation

Finally, a prenup or postnup can define how buyouts or compensation would be handled if a divorce affects liquidity or cash flow. This can be crucial when the divorcing partner’s financial obligations, such as property division or spousal support, create pressure to withdraw funds from the business. A well-drafted agreement can set clear rules for how and when funds may be accessed, whether distributions are capped, and whether the other partner has first rights to purchase any shares that might otherwise be transferred. It can even include mechanisms that delay or stagger payments to protect the company’s operations. In other words, the agreement not only safeguards ownership interests, but also ensures that one partner’s personal divorce doesn’t inadvertently drain working capital or destabilize the enterprise.

For businesses that rely on confidentiality or reputation, these protections are invaluable. They prevent public disclosure of financial records in divorce proceedings and preserve internal stability when personal issues arise.

Postnups: the second chance for protection

If your business partner is already married, a postnuptial agreement offers a valuable second chance. While not every couple is comfortable revisiting financial terms after marriage, a well-timed postnup can bring peace of mind, especially as businesses evolve, investments grow, or family situations change. Postnups can reaffirm that the business remains separate, reallocate marital and non-marital assets, and even protect the spouse by clarifying other financial rights, such as alimony or property division. When drafted transparently and voluntarily, courts in most states will uphold them. The key is that both spouses must receive full financial disclosure and independent legal counsel, ensuring fairness and enforceability. For you as a co-founder, the message remains simple: a postnup doesn’t just protect your partner’s marriage. It protects your company’s future.

Lessons from the courtroom

Courts have repeatedly underscored the importance of clarity and fairness in marital agreements involving business assets. In the 2000 case, In re Marriage of Bonds, the California Supreme Court upheld a prenup signed before marriage, emphasizing that voluntary execution and full disclosure were critical to enforceability (In re Marriage of Bonds (2000)). Meanwhile, cases like the 2010 Massachusetts case, Ansin v. Craven-Ansin, affirmed postnuptial agreements as valid when both parties entered them freely and with independent legal advice (Ansin v. Craven-Ansin (2010)). These precedents show that, when done correctly, such agreements don’t just stand up, they protect. For a business partner, that means less risk of your company being pulled into costly valuation disputes or forced sales during a partner’s divorce.

Final thoughts on whether you should encourage your business partner to get a prenup or postnup

In business, you can insure against almost anything, except human relationships. What Steve Jobs said rings true, “managing people is the hardest thing in business.” Each individual involved in a company has a personal life outside of the entity. However, when it comes to business owners, marriage, and divorce, the ups and downs of that personal life can have disastrous effects on a business. Encouraging your business partner to get a prenup or a postnup is not prying into their personal life. This topic is legitimately tied to your business. By making this request, you’re trying to protect the professional life you share.