Call us 
Protecting a Family Business
Chapters
Chapter 9
How to Protect a Family Business in a UK Prenup
A well-drafted prenuptial agreement is the most effective way to keep a family business out of a divorce settlement in England and Wales. It will not make the business untouchable in every case, but it can give a court strong reasons to leave it with the family.
For many business owners the worry is not just about money. It is about a company that parents or grandparents built, siblings who own shares, staff who depend on it, and a succession plan that could be thrown off course if shares had to be sold or transferred on divorce.
This guide explains how the courts treat business assets, what a prenup can do to protect them, and the steps that make an agreement much more likely to be upheld.
Are prenups legally binding in England and Wales?
Not automatically, but a properly prepared prenup will usually be upheld. There is still no statute that makes nuptial agreements binding, so the final decision rests with the judge.
The turning point was the Supreme Court’s 2010 decision in Radmacher v Granatino. The court said a judge should give effect to a nuptial agreement that each person entered into freely, understanding its implications, unless it would be unfair to hold them to it in the circumstances at the time of the divorce.
The 2026 reform proposals
On 5 June 2026 the Ministry of Justice opened a consultation, A fairer end to relationships. It proposes “qualifying nuptial agreements” that would be legally binding if set safeguards are met, building on the Law Commission’s 2014 recommendations. The consultation closed on 14 August 2026 and the government is now considering responses.
This is a proposal, not the law. Even under the proposed scheme, the government has said both spouses’ needs must still be met. A prenup drafted today to the Radmacher standard is the best protection available now, and the safeguards it uses closely mirror those in the reform proposals.
How the court treats a family business on divorce
Without a prenup, a family business is exposed in three ways: it can be needed to meet the other spouse’s needs, its growth during the marriage can be shared, and its value can count towards compensation.
The court starts by looking at all assets, whoever owns them. It then applies three principles:
- Needs – each spouse’s reasonable housing and income needs, especially where there are children. Needs come first and can reach any asset, including a business.
- Sharing – wealth built up during the marriage (matrimonial property) is usually shared equally.
- Compensation – occasionally awarded where one spouse gave up a career for the family.
The key distinction for business owners is between matrimonial and non-matrimonial property. Shares you owned before the marriage, or inherited or were gifted by family, are generally non-matrimonial and the court is less likely to share them. But the line blurs over time. Growth in the business during the marriage, especially growth driven by your own work, can be treated as matrimonial. Mixing business and family finances, or using business wealth to buy the family home, can also turn separate assets into shared ones.
A prenup helps by recording, at the outset, what both of you agree is separate and how growth should be treated, which gives the court clear evidence of your shared intentions.
Key prenup clauses that protect a family business
The strongest business clauses define the business precisely, deal with future growth, and show how the other spouse’s needs will be met from other assets.
- A precise definition of the business interest. Name the company, your shareholding and any loan accounts. Extend it to future shares, shares acquired through inheritance or family transfer, holding companies, successor businesses and the proceeds if the business is sold.
- Separate property status. Record that the business is, and will stay, your separate property, and that neither of you will claim against the other’s separate property.
- Treatment of growth during the marriage. State whether any increase in value, including growth from your own work, also stays separate. This is the clause most often argued about, so it needs to be explicit.
- Retained profits and dividends. Say how retained profits, dividends and director’s loans are treated, so income you draw for the family is distinguished from value left in the company.
- The other spouse’s role. If your spouse works in or helps the business, record that they are paid for that work and that it creates no claim to shares.
- Provision from other assets. Set out what the other spouse will receive instead, such as a share of the family home, a lump sum or pension sharing. An agreement that leaves one spouse without their needs met is the agreement most likely to be set aside.
- Valuation date and method. If a payment is ever linked to the business, agree in advance how and when it would be valued.
- Review clauses. Agree to review the prenup on events such as the birth of a child, a major change in the business, or after a set number of years.
Valuation, disclosure and independent advice
A business clause is only as strong as the process behind it. Courts look closely at whether the other spouse knew what they were agreeing to give up.
- Full financial disclosure. Share recent company accounts, your shareholding, director’s loan account and a realistic estimate of value. Hiding or understating the business is one of the quickest ways to undermine a prenup.
- A valuation where it matters. For a valuable or complex business, a valuation from an accountant gives both of you a reliable figure. A reasoned estimate may be enough for a smaller company, but it should be honest and explained.
- Independent legal advice for each of you. Each spouse should have their own solicitor. The same firm cannot act for both.
- Timing. Sign well before the wedding. The Law Commission recommended at least 28 days, and this is widely treated as best practice. Leaving it to the last few weeks invites claims of pressure.
- No pressure. Both of you must sign freely. This needs extra care with family businesses, where parents or other shareholders may be pushing for the agreement.
Common mistakes and the limits of protection
Most prenups that fail do so because of how they were made or how the couple behaved afterwards, not because of the wording.
- Ignoring needs. No prenup can leave a spouse or children without a home or reasonable income. If the business is your main asset, plan how needs would be met without breaking it up.
- Mixing finances. Paying household bills from the company, or using business proceeds for the family home, can blur the line the prenup draws. Keep business and family money separate.
- Not updating it. A prenup signed before children, or before the business tripled in value, may look unfair years later. Regular reviews, or a postnuptial agreement, keep it current.
- Signing late or under pressure. A prenup signed days before the wedding, or at a parent’s insistence, is easier to challenge.
- Thin disclosure. Leaving out a holding company, a loan account or a planned share transfer gives the other side grounds to argue they did not understand the deal.
Using a prenup alongside other business protections
A prenup works best as one layer of a wider plan that also covers the company’s own documents and the family’s estate planning.
- Shareholders’ agreement and articles. These can restrict share transfers, give other family shareholders pre-emption rights, and set what happens if shares are ordered to be transferred. They protect the company and the other shareholders, while the prenup deals with the couple.
- Family trusts. Holding shares in trust can add distance, but the court can still treat trust assets as a resource if a spouse benefits from them. The prenup should refer to any trust interests.
- Wills. Make sure your will is consistent with the prenup, so shares pass where you intend if you die rather than divorce.
Specialist advice on trusts, tax and share structures sits outside the prenup itself and is usually quoted separately.
Frequently asked questions
Can a prenup completely protect my family business?
It can give strong protection, but not a guarantee. The court can still look at the business if the other spouse’s needs cannot be met from other assets.
My parents want me to have a prenup. Is that a problem?
It is common and sensible for family shareholders to want one. But your partner must feel free to negotiate or refuse. Heavy family pressure, especially close to the wedding, can weaken the agreement.
What if I start or join the family business after we marry?
A prenup can still say how future business interests will be treated. If things change significantly after the wedding, a postnuptial agreement can update the position.
Does my partner need their own solicitor?
Yes. Independent legal advice for each of you is one of the most important safeguards. We advise one party and can refer your partner to a separate firm.
Do I need a business valuation?
Not always, but you must give honest and reasonable disclosure of the business’s value. For larger or complex companies, a professional valuation is strongly recommended.
Does this apply in Scotland or Northern Ireland?
No. This guide covers England and Wales only. Scotland and Northern Ireland have different rules.
Protect your family business with a prenup
If you own or expect to inherit shares in a family business, our solicitors can prepare a prenuptial agreement drafted to the Radmacher standard, with clauses tailored to your company and your family’s plans. We act for one of you, and can refer your partner to an independent firm from our panel.
Reviewed by Georgina Hitchins, Solicitor.
This article is general information about the law in England and Wales, not legal advice for your situation.