Standish v Standish: The landmark ruling on non-matrimonial asset division

On 2 July 2025, the UK Supreme Court delivered its judgment in Standish v Standish, a decision that brings much needed clarity to how non-matrimonial property is treated in divorce.

The Supreme Court upheld the Court of Appeal’s finding that only 25% of the assets transferred from the husband to the wife in 2017 to negate inheritance tax, had been matrimonialised; the remaining 75% were to continue to be treated as non-matrimonial.

It further held that transferring assets during a marriage for tax planning or for children’s benefit does not automatically convert them into shared marital assets. Instead, source of wealth, intention, use and treatment of non-matrimonial assets are relevant.

This decision provides clarity to family practioners and the courts as to how non-matrimonial assets become matrimonialised, and it may influence how future divorces handle complex asset divisions.

As specialists in family law, Grant Stephens Family Law regularly advises clients on complex financial arrangements and asset division. This comprehensive article examines the implications of cases like Standish v Standish, to help you understand how the law applies to your circumstances.

What happened in Standish v Standish? The facts.

The Standish v Standish case arose from financial remedy proceedings under the Matrimonial Causes Act 1973, centred on whether a large portfolio of assets owned by the husband prior to the marriage should be treated as matrimonial property and shared between the parties.

In 2017, the husband transferred investments worth approximately £77.8 million (investments owned individually before the marriage and therefore originally classified as his non-matrimonial assets) into the wife’s sole name as part of a tax planning strategy intended to benefit their children by negating inheritance tax. The marriage later broke down, and the classification of these 2017 assets was central to the dispute when dividing the financial estate.

Standish vs. Standish: Previous judgements

Before reaching the Supreme Court, Standish v Standish had already passed through two layers of the judicial system, each making a different decision:

High Court:

Mr Justice Moor held that the 2017 transferred assets had become matrimonial property by virtue of the transfer to wife.

He treated them as part of the matrimonial pot when determining the overall award, making them available for sharing. This resulted in a substantial award to the wife of 40% of those assets and 60% to the husband still reflecting the original source of the assets (namely, pre-acquired by the husband).  

Court of Appeal:

The Court of Appeal rejected that the simple transfer had matrimonialised the 2017 transferred assets, focusing instead on the source of the wealth, and intention to share beneficial ownership. They found that only a limited portion of the transferred assets were matrimonial, attributable to the period in which the husband worked during the marriage.

The rest were held to be non-matrimonial. This reduced the wife’s award significantly.

Supreme Court:

The Wife appealed the Court of Appeal’s decision but the Supreme Court unanimously dismissed the wife’s appeal, endorsing the Court of Appeal’s decision and clarified that non-matrimonial property does not lose its character simply because it is transferred between spouses. The Court of Appeal also clarified in its decision that the sharing principle does not apply to non-matrimonial property.

What does the sharing principle mean?

The sharing principle applies only to matrimonial property, which generally comprises of:

• Wealth generated by the parties during the marriage
• Wealth acquired by the parties during the marriage.

Division of matrimonial property is normally on an equal basis pursuant to the sharing principle, although the court may depart from equality if justified. The sharing principle does not extend to non-matrimonial property, which is property acquired before the marriage.

What does matrimonialisation mean?

Non-matrimonial property can become matrimonialised during a marriage in certain circumstances, making it available for sharing.

Matrimonialisation occurs when an asset originally outside the marriage is treated as part of the parties shared estate. The Supreme Court confirmed that the test for matrimonialisation focuses on:

• The intention of the owner of the non-matrimonial property.
• The treatment of the non-matrimonial property by the parties.
• The passage of time, which can indicate an intention to share; the longer an asset is treated as shared, the stronger the inference.

This clarification is significant because it provides the court with a clear framework for determining whether non-matrimonial assets have been matrimonialised and should be included in the shared estate.

What Standish v Standish means for real families.

While much of the discussion around Standish v Standish centres on legal principles, the real significance lies in its impact on families going through complex financial divisions. Here are the key points and how they can affect families:

Intention and treatment of non-matrimonial assets

Courts will examine the intention and treatment of non-matrimonial assets when determining whether such assets have been matrimonialised and should form part of the shared matrimonial estate.

Documenting intention and asset use is crucial

Keeping clear records of how property, investments, and funds are used and ensuring the intention behind any transfer or use of assets is properly recorded as it could significantly influence how the court assesses asset categorisation.

Specialist legal advice is essential

High-value or complex cases often involve a mix of matrimonial and non-matrimonial assets. Expert guidance ensures that your position is protected, and that the division reflects both fairness and the practical realities of your circumstances.

Reviewing pre- and post- nuptial agreements

Existing prenuptial and postnuptial agreements may need to be revisited to account for the principle of matrimonialisation, ensuring they remain effective in protecting non-matrimonial assets.

The Standish v Standish case reinforces the importance of proactive planning and meticulous financial records. As highlighted by the Supreme Court, how assets are used in the marriage affects classification.

Learn from Standish vs. Standish for your financial planning

At Grant Stephens Family Law, we understand that divorce is a deeply personal journey with real financial and emotional stakes. The Standish v Standish ruling underscores how crucial it is to carefully assess all assets, both matrimonial and non-matrimonial, and to plan settlements that reflect fairness and future security.

If you want more information about what is a matrimonial asset and what is a non-matrimonial asset, read about it here: Matrimonial vs. Non-matrimonial assets in divorce: the differences explained.

Our expert Welsh family law team can help you:

• Review pre- and post-nuptial agreements to ensure they remain effective in protecting your interests.
• Analyse asset classification in light of matrimonialisation, clarifying which assets may be considered part of the shared estate.
• Plan settlements that are just and practical, balancing financial realities with family needs and long-term stability.

Ready to take the next step?

Specialist advice is essential when you’re handling complex divorces or high-value asset divisions. And with Grant Stephens Family Law by your side, you have a practical roadmap for moving forward.

Take a look at our divorce services and let our experienced team guide you through every stage of the process.

If you want to take the next step and book an initial consultation, you can:

Call our firm on 02921 679 333

Email our team: enquiries@grantstephensfamilylaw.co.uk

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