Meta description: A judge upheld a prenuptial agreement despite 'sub-optimal' drafting, reinforcing that valid agreements stand unless unfair. Family law solicitors UK explain the ruling.

A recent decision from the Central Family Court has provided an important reminder for anyone considering a prenuptial agreement in England and Wales: imperfect drafting does not necessarily make an agreement unenforceable.

In IC v AD [2026] EWFC 224, reported by the Law Gazette on 18 August 2026, His Honour Judge Edward Hess upheld a prenuptial agreement despite describing it as “a piece of sub-optimal drafting” and “not a model of clarity”.

The ruling does not mean that drafting quality is unimportant. Quite the opposite. The case demonstrates both the strength of a properly entered nuptial agreement and the risks of leaving important financial arrangements unclear.

For couples with significant assets, business interests, inherited wealth or children from previous relationships, the judgment offers valuable guidance about protecting wealth on divorce.

What happened in IC v AD?

The case involved total assets of approximately £26.6 million. Of that sum, around £8.6 million was realisable, while approximately £18 million was deferred or non-realisable.

The wife challenged the effect of the prenuptial agreement and argued, among other matters, that she had understood the agreement to relate only to two properties owned by the husband before the marriage.

The judge rejected that interpretation. He found that the parties had freely entered into the agreement and that the wife understood its significance. Although the wording was criticised, the agreement was upheld in accordance with the husband’s interpretation.

The wife received approximately £2.837 million, together with a £1 million capitalised spousal maintenance fund. The judge considered that this package was sufficient to meet her needs. The husband retained the remainder of the assets in accordance with the terms of the agreement.

The financial dispute had generated legal costs of more than £1 million, demonstrating how expensive uncertainty can become when a document is challenged.

In his judgment, HHJ Hess said:

“I have found it difficult on the facts of this case to identify any feature of the case which would cause me to depart from an implementation of the pre-nuptial agreement on the basis of anything other than need.”

The full judgment is available in IC v AD [2026] EWFC 224 on BAILII. The decision was also reported in the Law Gazette’s coverage of the ruling.

Are prenuptial agreements enforceable in England and Wales?

At present, prenuptial agreements are not automatically legally binding in England and Wales. The court retains jurisdiction to decide financial claims on divorce under the Matrimonial Causes Act 1973.

However, the Supreme Court’s decision in Radmacher v Granatino established that courts should generally give a prenuptial agreement decisive weight where:

• The agreement was entered into freely;
• Both parties understood its implications; and
• It would not be unfair to hold the parties to the agreement.

The court will therefore look at the circumstances in which the agreement was negotiated and signed, the quality of the advice received, the financial disclosure provided, and whether the agreement makes fair provision for the parties’ needs.

The judgment in IC v AD reinforces this approach. The court was prepared to enforce an agreement even though the drafting was not ideal because the procedural safeguards were sufficiently strong, the parties understood the agreement and the outcome met the wife’s needs.

This is an important distinction. A prenup does not become enforceable merely because it exists. Its reliability depends on both the process and its substance.

What does “sub-optimal drafting” mean?

The judge’s criticism of the agreement should not be interpreted as approval of poorly drafted documents.

An agreement may be described as “sub-optimal” where its wording is ambiguous, incomplete or open to more than one reasonable interpretation. Examples might include:

• Failing to define whether a particular asset is separate or matrimonial property;
• Using inconsistent descriptions of property or financial accounts;
• Failing to explain how future increases in value will be treated;
• Not specifying how maintenance or housing needs will be addressed;
• Omitting clear provisions for business interests, pensions or inheritances;
• Using vague wording about which country’s law should apply; or
• Failing to explain what should happen if circumstances change significantly.

In IC v AD, the court was able to determine what the parties intended despite the drafting deficiencies. That process was likely assisted by the surrounding evidence, including the parties’ conduct, the negotiations and the circumstances in which the agreement was signed.

Another case may produce a different result. Ambiguous drafting can lead to expensive litigation about interpretation before the court even reaches the question of fairness.

A carefully prepared agreement should allow both parties, their advisers and ultimately the court to understand precisely what was intended.

The importance of the “needs” exception

The central lesson from the case is that needs remain the principal reason a court may depart from a prenuptial agreement.

A couple may agree that certain assets should remain separate, or that wealth accumulated before the marriage should not automatically be divided equally. However, an agreement cannot safely be used to leave one spouse without reasonable housing, income or financial security.

Needs are assessed on the individual facts. Relevant considerations may include:

• The parties’ housing requirements;
• Their income and earning capacity;
• The standard of living during the marriage;
• The length of the marriage;
• The age and health of each party;
• The care of any children;
• The availability of capital and income; and
• Any disabilities or other special circumstances.

Needs do not necessarily mean that both parties receive an equal share of the assets. Particularly where substantial wealth is involved, a court may conclude that one party’s reasonable needs can be met without disturbing the wider structure of the agreement.

That is what happened in IC v AD. The wife received a substantial settlement and a fund for future maintenance. The judge concluded that her needs were met and found no separate fairness-based reason to override the agreement.

The practical point is that a prenup should be drafted with realistic needs in mind. Clauses that attempt to exclude all financial provision, regardless of future circumstances, may be vulnerable if they would produce hardship at the point of divorce.

Why good drafting still matters

The outcome in IC v AD may appear reassuring to people who already have a prenup containing unclear wording. However, it should not encourage couples to rely on generic templates or informal agreements.

Good drafting can:

1. Reduce the scope for disagreement
   Clear definitions make it easier to establish which assets are protected and which are to be shared.

2. Avoid costly satellite litigation
   In the reported case, the prenuptial agreement was the issue that most divided the parties. The legal costs illustrate the financial consequences of uncertainty.

3. Demonstrate the parties’ intentions
   A detailed document records the agreement reached and the basis on which it was negotiated.

4. Address future changes
   Wealth, family responsibilities, property ownership and business interests can change considerably during a marriage.

5. Provide a workable solution
   A court is more likely to respect an agreement that sets out practical arrangements for housing, income, pensions and capital.

A robust agreement should be supported by full and honest financial disclosure. Each party should normally obtain independent legal advice from a separate solicitor. The agreement should be negotiated well before the wedding, rather than presented shortly before the ceremony when one party may feel pressured to sign.

It should also be reviewed if there is a major change in circumstances, such as the birth of a child, a significant inheritance, a substantial change in wealth or a move to another country.

How does this connect with qualifying nuptial agreement reforms?

The decision comes at a significant time for nuptial agreement law.

The Government has consulted on proposals for “qualifying nuptial agreements”. The reforms are intended to provide greater certainty for couples who want to agree in advance how their financial affairs should be treated if their relationship ends, while preserving safeguards against unfairness.

The proposals have been discussed against the background of longstanding recommendations from the Law Commission. The Government’s consultation document, A Fairer End to Relationships, sets out the wider reform context.

The proposed reforms have not yet replaced the current law. Until legislation is enacted and comes into force, couples must continue to rely on the existing approach developed through case law.

Nevertheless, IC v AD shows why reform may be attractive. At present, a well-prepared prenup can carry considerable weight, but it cannot remove the court’s responsibility to assess fairness and needs on divorce. A statutory framework could offer more predictable consequences where specified safeguards have been satisfied.

That does not make professional advice less important. If qualifying agreements are introduced, formal requirements are likely to matter even more. Couples will need to understand what protections are available, what conditions must be met and how their agreement interacts with future needs and children’s welfare.

What should couples do now?

Anyone considering a prenuptial agreement should start the process early and treat it as a serious financial planning exercise.

You should consider:

• Identifying all assets, liabilities, income sources, pensions and business interests;
• Agreeing what should happen to pre-marital and inherited wealth;
• Considering how future children and housing needs will be addressed;
• Obtaining independent legal advice for both parties;
• Allowing sufficient time for negotiation;
• Avoiding pressure or last-minute signing;
• Including clear provisions for review and significant changes; and
• Ensuring the final document accurately reflects the agreement reached.

Those who already have a prenup should not assume that a drafting problem automatically invalidates it. Equally, they should not assume that IC v AD guarantees enforcement. The court’s decision depended on the particular facts, the parties’ understanding and the conclusion that the wife’s needs had been met.

Speak to Tyndel Solicitors

The latest ruling is best understood as a measured development, not a licence for careless drafting. A validly entered agreement may be upheld even when the wording is criticised, but clarity, fairness and proper legal advice remain the best protection against future conflict.

Tyndel Solicitors advises clients on prenuptial and postnuptial agreements, divorce, financial remedies and complex asset protection. Our family law solicitors UK team provides practical advice tailored to your circumstances, including for high-value assets, businesses, pensions, inherited wealth and international connections.

If you are planning a marriage, reviewing an existing agreement or facing divorce where a prenup is in place, speak to our Expert Divorce Lawyers for clear, strategic advice. Contact Tyndel Solicitors’ Family Law team to discuss your circumstances.