Prenuptial Agreements for Business Owners and Executives in Michigan

Most prenuptial agreements that fail in court fail for the same reasons — and all of them are avoidable. For business owners and executives, the financial stakes of a prenup are substantially higher than for most couples. A business interest, equity compensation package, or professional practice that took years to build can be at risk in a divorce if it is not properly addressed before the marriage begins.

This article is specifically for business owners and executives who need a prenuptial agreement that protects significant assets. If you are looking for general information about prenups in Michigan, see our companion article on prenuptial agreements in Michigan.

Michigan's Enforceability Standard

Michigan has not adopted the Uniform Premarital Agreement Act. Instead, prenuptial agreements are governed by common law, with the controlling standard established in Rinvelt v Rinvelt, 190 Mich App 372 (1991).

Under Rinvelt, a prenuptial agreement is enforceable if:

1. It was not the product of fraud, duress, mistake, or misrepresentation. Both parties must enter the agreement freely, with accurate information about each other's finances.
2. It was not unconscionable when executed. The terms cannot be so one-sided that no reasonable person would agree to them under the circumstances.
3. Both parties entered voluntarily with knowledge of the other's financial situation. Full, written financial disclosure is essential.

An important limitation comes from Allard v Allard: parties cannot fully waive the court's statutory equitable power to reach separate property to create fairness between spouses. A prenup that attempts to place assets unconditionally beyond the court's reach may not be fully enforceable as written. This is a nuance that requires experienced counsel to navigate.

What Business Owners Should Address

A prenup for a business owner needs to go beyond the standard provisions about premarital assets and spousal support. It should specifically address:

Business Classification

The most important provision: define the business as separate property and specify how it will be treated if the marriage ends. This includes:

• The pre-marital business is and remains the separate property of the owning spouse
• Future appreciation — will all appreciation be separate, or only passive appreciation? If the business doubles in value due to the owner's active efforts during the marriage, is that growth separate or marital? This is the provision that gets litigated most often, so the language must be precise.
• New businesses started during the marriage — will they be marital or separate? What if a new venture is funded with separate property?

Valuation Methodology

Agreeing on a valuation methodology in advance eliminates one of the most contentious issues in a high-asset divorce. The prenup can specify:

• Which valuation method will be used (income, market, or asset approach)
• How goodwill will be treated (enterprise vs. personal, or excluded entirely)
• Who will perform the valuation (a mutually agreed appraiser, or each party retains their own)
• A valuation date (date of separation, date of filing, or another defined date)

Management Authority

During the marriage, the business-owning spouse typically wants full management authority — the right to make business decisions without spousal consent. The prenup can confirm that:

• Management decisions are solely the owner's
• The non-owning spouse has no claim to management authority or board participation
• Business distributions and compensation decisions are at the owner's discretion, subject to any support provisions in the prenup

Business Income vs. Business Value

A critical distinction: the prenup may protect the business itself from division, but the income generated by the business is typically available for spousal support. The agreement should clearly distinguish between the two and address how business income will be treated for support purposes.

Executive Compensation Provisions

For executives whose compensation includes equity, deferred compensation, and performance bonuses, the prenup should address:

Stock options and RSUs — Define whether grants received during the marriage are marital or separate. The coverture fraction approach can be built into the agreement, or the parties can agree that all equity compensation is the earning spouse's separate property (though this aggressive position is more likely to be challenged).

Bonuses — Annual bonuses earned during the marriage are typically marital income. The prenup can address whether bonuses are available for support or are treated differently.

Deferred compensation — 409A plans, SERPs, and supplemental retirement arrangements earned during the marriage. The prenup should specify treatment, especially for plans with long deferral periods.

Change-of-control and severance payments — These can be substantial and often arise at unpredictable times. Addressing them in the prenup avoids disputes about whether a severance package received during the divorce process is marital or separate.

Common Mistakes That Invalidate Prenups

Last-Minute Signing

An agreement presented days before the wedding — or worse, the night before — invites claims of duress. The implicit message is "sign this or the wedding is off," and Michigan courts are sympathetic to that argument. Begin the process at least three months before the wedding date.

Incomplete Financial Disclosure

The disclosure requirement under Rinvelt demands that both parties have knowledge of each other's financial situation. This means full, written, verified disclosure of all assets, liabilities, income sources, and business interests. A schedule of assets attached to the prenup is standard practice.

Omitting assets — even unintentionally — can invalidate the entire agreement. The disclosure should be comprehensive, not just what each party thinks is relevant.

One-Sided Terms Without Justification

A prenup that gives everything to one spouse and nothing to the other may be deemed unconscionable. Courts look at the overall fairness of the agreement at the time it was executed. An agreement can favor one party — that is the point — but it cannot be so extreme that it shocks the conscience.

Including reasonable provisions for the less-wealthy spouse — a minimum asset division, a support floor, or escalating benefits based on the length of the marriage — strengthens enforceability significantly.

No Independent Counsel

Both parties should have their own attorney. An agreement where one party is represented and the other is not — or where one party's attorney drafted the agreement and the other simply signed it — creates a strong argument that the unrepresented party did not understand what they were agreeing to.

Verbal Promises That Contradict the Agreement

"I know the prenup says this, but I promise I'll take care of you." Verbal promises that contradict the written agreement create ambiguity and potential grounds for challenge. The written agreement should stand on its own, and both parties should understand that oral representations are not enforceable.

Postnuptial Agreements

If you are already married and did not execute a prenup, a postnuptial agreement can address many of the same issues. Michigan courts apply the same Rinvelt enforceability standard to postnuptial agreements.

Postnuptial agreements are appropriate when:

• Circumstances have changed — a business has grown significantly, an inheritance has been received, or one spouse is starting a new venture
• A prenup was not executed — the parties may have been young, did not have significant assets, or simply did not think of it
• The existing prenup needs updating — business circumstances, family situation, or financial positions have changed materially

The process is the same: full disclosure, independent counsel, voluntary execution, and reasonable terms.

The Bottom Line

A prenup is only as strong as its process. The substance of the provisions matters, but the way the agreement is negotiated, disclosed, and executed is equally important. For business owners and executives, the investment in a properly drafted prenuptial agreement is a fraction of the cost of litigating business valuation and division in a contested divorce.

If you are planning a marriage and want to protect your business, equity compensation, or professional practice, start the conversation early. A prenup drafted with adequate time, full disclosure, and independent counsel for both parties is the strongest protection available.