Are Prenuptial Agreements Legally Binding in the UK?

Lisa Pepper

Prenuptial agreements are more common than ever in England and Wales, particularly where one or both partners have significant assets, a business, children from a previous relationship or family wealth to protect. The question we are asked most often is a simple one. Is a prenup actually legally binding?

The honest answer today is that it is not automatically binding, although a well-prepared agreement carries real weight with the court. That position may be about to change. In June 2026 the government opened a consultation that could, for the first time, make nuptial agreements binding by law.

This article explains how prenups are treated by the courts now, what the proposed reforms would change, and what you should do if you are thinking about an agreement. The reforms are still only proposals at this stage, so nothing has changed in the law yet.

Are prenups legally binding in England and Wales right now?

Prenuptial agreements are not strictly legally binding in England and Wales. A court is not obliged to follow one. However, following a key Supreme Court decision, judges now give significant weight to a prenup when deciding how finances should be divided on divorce.

That decision was Radmacher v Granatino in 2010. The Supreme Court held that a prenup should be given decisive weight where it was freely entered into by both parties, with a full appreciation of its implications, unless it would be unfair to hold them to it. In practice this means a properly prepared agreement is often upheld, even though it is not technically binding.

So a prenup does not automatically decide the outcome of a divorce, but it can be highly persuasive. The care taken when it is drawn up makes the difference.

When will a court uphold a prenuptial agreement?

A court is far more likely to follow a prenup if certain safeguards were in place when it was signed. The key factors are:

• Both parties entered into the agreement voluntarily, with no pressure.
• Each person received independent legal advice.
• There was full and honest financial disclosure on both sides.
• The agreement was signed well before the wedding, usually at least 28 days.
• The terms are fair and do not leave one person in serious financial hardship.

Where these conditions are met, a court will usually attach significant weight to the agreement when deciding a financial settlement.

When might a prenup not be upheld?

Even though the courts now respect prenups, they can still decline to follow one if doing so would produce an unfair result. A court may depart from a prenup if:

• One party was pressured into signing it.
• There was not enough time to consider it properly before the wedding.
• One party did not receive independent legal advice.
• There was no full financial disclosure.
• The agreement would leave one party unable to meet their basic needs, or fails to provide for any children.

The needs of any children, and of a financially weaker spouse, will always be a central concern for the court.

Are prenups about to become legally binding? The 2026 reforms

On 5 June 2026 the Ministry of Justice opened a consultation called “A fairer end to relationships”, which closes on 14 August 2026. One of its central proposals is to introduce qualifying nuptial agreements, a new category of prenup and postnup that the court would be required to uphold, provided certain safeguards were met.

This sits within a wider plan to reform the law on financial settlements. The government is proposing a “codification-plus” model, which would put the main principles the courts already use, around needs and the sharing of matrimonial property, into a single statute. The aim is to make outcomes more predictable. The change responds to a Law Commission report published in December 2024, which found that the current law, based on the Matrimonial Causes Act 1973, gives couples too little certainty about where they stand.

If the proposal becomes law, a qualifying nuptial agreement would no longer be just persuasive. It would be binding, giving couples genuine confidence that the agreement they sign is the agreement that will apply.

What would make a nuptial agreement “qualifying”?

The consultation does not yet set out the final conditions, and the exact requirements would be confirmed in legislation. The safeguards are expected to mirror what already makes a prenup persuasive today, building on the Law Commission’s earlier recommendations. They are likely to include that:

• The agreement is in writing and signed as a deed.
• Both parties received independent legal advice before signing.
• Both gave full financial disclosure.
• A prenup was signed a set period before the wedding (the Law Commission previously suggested at least 28 days).
• The agreement cannot override each person’s financial needs, or the needs of any children.

The last point matters. Even under the proposed reforms, a qualifying agreement is unlikely to be allowed to leave one partner unable to meet their reasonable needs. The protection for the financially weaker party, and for children, would remain.

Should you wait for the new law before making a prenup?

No. There is no need to wait, and good reasons not to.

The reforms are still only proposals. Even on an optimistic timetable, any new law would take time to pass and come into force, with some commentators suggesting 2027 at the earliest. In the meantime, a carefully drafted prenup already carries real weight under Radmacher, and the steps that make an agreement strong today are the same ones likely to make it “qualifying” in future. An agreement prepared properly now should stand you in good stead either way.

If you already have a prenup or postnup, it is worth having it reviewed, particularly if your circumstances have changed since you signed it. We can check that it still reflects your wishes and is as robust as possible.

Why couples choose a prenuptial agreement

A prenup can give both partners clarity and certainty before they marry. It is especially useful where there are assets, a business or family wealth that one person wants to protect. Common reasons include:

• Protecting assets built up before the marriage.
• Safeguarding a family business.
• Preserving an inheritance or family wealth.
• Setting clear financial expectations from the outset.
• Reducing the risk of a bitter dispute if the relationship later ends.

Far from being unromantic, many couples find that agreeing the financial position in advance removes a source of anxiety. This is often particularly valuable in a high-net-worth divorce or where one partner is protecting an inheritance.

Prenups and postnups: what is the difference?

A prenuptial agreement is made before the wedding. A postnuptial agreement is made after it. Both are treated in the same way by the courts and both could fall within the proposed qualifying nuptial agreement rules.

Couples often turn to a postnup when circumstances change, for example after receiving an inheritance or starting a business, or simply because there was not enough time to put a prenup in place before the wedding.

How a prenup affects a divorce financial settlement

If a marriage ends, the court considers all the circumstances when deciding a financial settlement. A prenup can be an important part of that picture, but it is not the only factor. The court still looks at housing, income, pensions, the needs of any children and overall fairness.

A prenup is at its most useful in defining what counts as separate, non-matrimonial property, such as pre-marital or inherited assets. You can read more about how the courts approach this in our guide to matrimonial and non-matrimonial assets.

How we can help

Our family law team advises couples across England and Wales on preparing, reviewing and negotiating prenuptial and postnuptial agreements, including high-value and international cases. We will draft an agreement that reflects your circumstances and is as likely as possible to be upheld, both under the law as it stands and under the reforms being proposed. If you already have an agreement, we can review it to make sure it still protects you.

To speak to one of our prenuptial agreement solicitors, call us on 020 7485 8811 or fill in the contact form below.