A prenup for business owners is one of the smartest pieces of protection a founder can put in place. If you own or part-own a business, a divorce can put it at risk — potentially forcing a sale, a large payout, or even the involvement of an ex-spouse in a company you built. For many owners the business is not just an asset but their livelihood and their employees' livelihoods too. A prenuptial agreement is one of the clearest, most effective ways to protect it, and this guide explains how to do it well.
Why a business is vulnerable in a divorce
A business can be treated as a matrimonial asset, and its value taken into account when finances are divided — even if your spouse never worked in it. In practice that can mean:
- Forced valuations — the business has to be valued, which is costly, intrusive and often disputed.
- Pressure to release cash — to fund a settlement you may have to take money out, sell shares, or take on debt.
- Disruption to co-owners — partners, co-founders and investors can be dragged into your divorce.
- Loss of control — in the worst case, a stake in the business ends up with an ex-spouse.
See how a business is treated in a divorce for the full picture.
What a prenup can do for a business owner
- Ring-fence the business as one partner's separate property.
- Set out how any increase in its value during the marriage is treated.
- Protect co-founders and investors from disruption to the company.
- Record what each partner is bringing in, so it is clear from the start.
- Reduce the need for a contested valuation later by agreeing the approach in advance.
Prenups for business owners: getting it right
The strongest prenup for business owners does two things at once: it ring-fences the business as separate property and sets a fair approach to any growth in its value during the marriage, while still making proper provision for the other partner from other assets. That balance matters — an agreement that leaves your spouse with nothing is far more likely to be challenged than one that protects the business and provides fairly for them. A prenup usually works best alongside a shareholders' or partnership agreement, so the two documents pull in the same direction. See protecting a family business and, if you run a business with your partner, a prenup where you own a business together.
Get the disclosure right
Be open about the business and its value — hiding or understating it is a common reason an agreement is later challenged. Provide a realistic sense of what the business is worth as part of your full and frank disclosure (here is how to value assets for a prenup). Given the sums usually involved, this is an area where independent legal advice genuinely pays for itself. As always, the court keeps its duty to meet needs, so an agreement has to be fair as well as protective — see what to include in a prenup.
What a court can do to a business, and how it decides how much is shared
The powers are wider than most founders realise. Section 24 of the Matrimonial Causes Act 1973 allows the court to order one spouse to transfer property to the other, and shares in a private company are property. Section 24A allows an order for sale, and section 23 allows a lump sum that in practice may only be raised by borrowing against the company or selling part of it. What holds courts back from using those powers on a trading business is section 25 of the Matrimonial Causes Act 1973 itself, which requires them to weigh each party's income and earning capacity: a business is usually the income as well as the asset, and destroying it to divide it serves nobody. So the typical order leaves the shares with the owner, values them with a discount for illiquidity, and gives the other spouse more of the house, savings or pension instead. Reluctant is not the same as unable, and where the business is the only significant asset the pressure to raise money from it is real.
How much of the business is shared is the question that drives the cost of a contested case, and the Supreme Court's 2025 decision in Standish v Standish now frames it. The sharing principle applies to matrimonial property and not to assets brought into the marriage, unless the couple have over time been treating them as shared. A company founded before the wedding is non-matrimonial at the outset. Its growth during the marriage, built with the owner's work while the other partner ran the home, is the contested part, and courts commonly treat growth that merely tracks the market as keeping the character of the original asset while sharing growth from effort during the marriage. A prenup that records the value at the date of the marriage, with the accounts attached to the financial disclosure, and states how growth is to be treated, settles in advance the argument that otherwise pays for two forensic accountants.
Two structural points complete the picture. If you run the business with others, the partnership deed or shareholders' agreement can restrict transfers to outsiders and give the other owners a right of first refusal, so that even a court order for a transfer runs into the company's own rules; a prenup and those documents should say the same thing. And if you run it with your spouse, section 1 of the Partnership Act 1890 makes the two of you partners in law whether or not you signed anything, which is a reason for the prenup to say who keeps the business and on what valuation. The court retains its discretion to meet needs under section 25, so the agreement has to provide for the other partner from other resources; an agreement that protects the business while doing that is the version courts uphold.
Business owner prenup FAQs
Can a prenup fully protect my business?
It can give a court a strong steer to keep the business separate, but a court will still ensure both partners' needs are met (see protecting a family business).
What happens to my business if it grows during the marriage?
A prenup can set out how that growth is treated — see how a business is treated in a divorce.
Is my business at risk even if my spouse never worked in it?
Potentially yes — its value can still be taken into account, which is exactly why a prenup is worth having.
What about shares and stock options?
These can be dealt with too — see shares and stock options in a prenup.
Should the prenup mention my shareholders' agreement?
Ideally the two are consistent, so the prenup supports rather than contradicts the company's own documents.
Create your prenuptial agreement online
UK Prenup lets couples in England & Wales create a clear, fair prenuptial agreement online from £199, with your document generated instantly as a PDF. See how it works or get started.
UK Prenup is not a law firm and does not provide legal advice. A prenuptial agreement in England & Wales is not automatically binding, and both partners should take independent legal advice before signing.