For many people, discussing a prenuptial agreement before marriage can feel uncomfortable. However, for business owners, high and ultra-high net worth individuals and families with substantial wealth, a well-drafted prenuptial agreement is often one of the most effective tools available to protect wealth, provide certainty and reduce the risk of costly litigation in the future.

As family structures and wealth arrangements become increasingly complex, pre-nuptial agreements are increasingly being used as part of wider wealth planning, helping individuals preserve family assets, protect businesses and create clarity prior to marriage.

At JMW, we regularly advise entrepreneurs, professionals, trustees, family offices and ultra-high-net-worth (UHNW) families on the strategic use of pre and post-nuptial agreements as part of a broader asset protection and wealth preservation strategy. Our experience highlights that the right agreement can provide reassurance, transparency and stability for both parties entering a marriage.

Why wealth protection matters before marriage

Many individuals spend years, or even decades, building businesses, acquiring investments, inheriting family assets or establishing trusts for future generations. Without appropriate planning, a future divorce could potentially expose some of these assets to substantial financial claims.

Why family wealth requires a different approach

For wealthy families, a pre-nuptial agreement is rarely just about protecting one person's assets. It often sits within a wider architecture of family wealth and succession planning.

Generational wealth may be held across a range of complex structures, including family businesses, trusts, family investment companies, property portfolios, offshore assets and family office arrangements. These structures can create significant complexity. Ownership and control may not sit neatly with one individual, even where that individual is a beneficiary or shareholder.

A well-prepared pre-nuptial agreement can help record how the parties understand those structures, which assets are intended to remain outside the matrimonial sharing principle, and how future gifts, inheritances or liquidity events should be dealt with.

For UHNW families, this level of planning is essential. It helps ensure that the agreement reflects not only the couple's personal position, but also the wider family's assets and intention to preserve, grow and transfer wealth across generations.

Protecting family wealth across generations

One of the most common concerns among wealthy families is preserving assets that have been accumulated over several generations. Family businesses, inherited wealth, trusts and investment structures are often viewed differently from assets built up jointly during a marriage. Nevertheless, the treatment of these assets during divorce can be complex.

A pre-nuptial agreement can help clarify how inherited wealth, family gifts, business interests and trust distributions should be treated, reducing the risk that assets intended for future generations become the subject of litigation on divorce. It can also sit alongside wills, trusts, shareholder arrangements and wider estate planning, helping ensure that the family's intentions are aligned across a family’s interests.

When prepared carefully, this can provide reassurance not only to the couple, but also to parents, grandparents, trustees, shareholders and other family members who may have an interest in preserving the family's long-term wealth strategy.

Common mistakes wealth holders make

The effectiveness of a pre-nuptial agreement often depends as much on process as content. Common mistakes include waiting until shortly before the wedding, failing to provide full financial disclosure (including wider family wealth which may come to the party who is marrying), or treating the agreement as a one-off document that never needs to be revisited.

Other risks arise where future inheritances, trust interests, business growth or planned liquidity events are not considered properly. A business that appears modest at the date of marriage may become substantially more valuable over time, particularly where there is expansion, external investment or a sale.

Wealth holders should also avoid assuming that a trust, family investment company or inherited asset is automatically protected. The court will look at the reality of the parties' financial circumstances, including need, fairness and the way assets have been used during the marriage.

A strong agreement should therefore anticipate future change. This may include children, relocation, new business ventures, asset restructuring, changes in tax planning and the receipt of substantial gifts or inheritances.

Regular review is also important. A pre-nuptial agreement that was fair and appropriate at the outset may need to be revisited after major life events, including the birth of children, a business sale, a significant inheritance or a material change in wealth.

Wealth protection beyond the prenuptial agreement

For many high and ultra-high net worth individuals, a pre-nuptial agreement is only one element of a broader wealth protection strategy.

JMW Signature is the firm’s specialist cross practice service focused on delivering legal solutions for the largest and most complex families, bringing together family law, private client, trusts, tax, corporate, real estate and property expertise to help families preserve, grow and transfer wealth across generations.

Our integrated approach is particularly valuable where personal relationships, commercial interests and dynastic wealth planning intersect. JMW Signature enables clients to access strategic advice from specialists who understand the legal, commercial and personal dimensions of substantial family wealth. This allows families, family offices and business owners to approach wealth protection in a joined-up way rather than treating each issue in isolation.

Whether the objective is protecting family wealth before marriage, safeguarding a business, implementing trust structures, managing international assets or planning for future succession, clients benefit from access to a network of UHNW specialists capable of addressing complex interconnected issues.

How JMW Can Help

Every family and every wealth structure is different. Our role is to provide strategic, tailored advice that reflects your circumstances, protects what matters most and supports your long-term objectives.

If you are considering a pre-nuptial agreement and would like advice on protecting your personal, family or business wealth, our specialist family law team would be pleased to help.