Couples increasingly ask a solicitor to draw up a prenuptial or postnuptial agreement before or during a marriage, expecting it to work the way a commercial contract does. In England and Wales it does not, quite. This guide covers England and Wales only; Scotland treats nuptial agreements differently under its own law.
Not automatically binding
A nuptial agreement, whether signed before the wedding as a prenup or afterwards as a postnup, is not automatically enforceable in England and Wales in the way a normal contract is. On divorce, a court retains its broad statutory discretion under section 25 of the Matrimonial Causes Act 1973 to decide how the couple’s finances should actually be divided, and no private agreement between the couple can simply remove that discretion. That has historically made nuptial agreements a weaker instrument in England and Wales than in many other jurisdictions.
The Radmacher test
That position shifted substantially with the Supreme Court’s 2010 decision in Radmacher v Granatino. The court held that a nuptial agreement freely entered into by each party, with a full appreciation of its implications, should be given effect unless it would not be fair, in the circumstances prevailing at the time, to hold the parties to it. Following Radmacher, a properly made agreement is not treated as binding in the strict contractual sense, but a court will now give it what has been described as decisive weight, meaning it is likely to be followed unless something makes it unfair to do so.
What makes an agreement more likely to be upheld
Because the test turns on whether the agreement was freely entered into with a full appreciation of its implications, and whether holding the parties to it would be fair, certain practical safeguards materially improve the chances a court will follow it. Both parties should take independent legal advice before signing, separately from each other. Each side should give full and honest disclosure of their financial position, so neither can later say they signed without understanding what they were giving up. The agreement should be signed with enough time before the wedding that no one can credibly claim they were pressured close to the date, commonly cited guidance suggests it should be finalised at least 28 days beforehand. Finally, the agreement should not leave either party, or any children of the family, without their financial needs being met, since a court is more likely to find it unfair to enforce an agreement that leaves someone in genuine hardship.
Postnuptial agreements work the same way
A postnuptial agreement, signed after the marriage has already taken place, is assessed by the courts on broadly the same fairness principles as a prenup. The main practical difference is timing: because it is signed after the wedding, the argument that one party felt pressured by an approaching ceremony date does not usually arise, though the same requirements for independent advice, full disclosure and overall fairness still apply.
A possible change is coming
The position may not stay as it is. The Ministry of Justice opened a public consultation, “A fairer end to relationships,” running from 5 June 2026 to 14 August 2026, which specifically asks for views on introducing legally binding qualifying nuptial agreements, allowing couples to make genuinely binding arrangements about the financial consequences of divorce, subject to safeguards intended to ensure any such agreement is entered into freely and with full information. This is a proposal, not a change in the law; any resulting legislation would need a government response to the consultation and then parliamentary time, so the current Radmacher-based approach continues to apply for now.
FAQs
If I sign a prenup, can a court simply ignore it?
A court cannot be contractually forced to follow it, but under the Radmacher test it will normally give a properly made agreement decisive weight, so ignoring it altogether would be unusual unless it were unfair to enforce.
Does a postnuptial agreement carry less weight than a prenup?
No. Courts apply broadly the same fairness-based approach to both; the main difference is the timing-related pressure argument that can sometimes affect prenups signed very close to the wedding date.
Can a prenup leave my children with nothing if we divorce?
A court is more likely to depart from an agreement that fails to meet the needs of any children of the family, since that unfairness is exactly the kind of circumstance the Radmacher test allows a court to weigh.
Are prenups about to become fully binding by law?
Not yet. The Ministry of Justice’s 2026 consultation proposed introducing binding qualifying nuptial agreements, but as of now this remains a proposal, not enacted law.
The bottom line
Prenuptial and postnuptial agreements are not automatically binding in England and Wales, but since Radmacher v Granatino in 2010 a court will generally give decisive weight to one that was freely entered into, with full appreciation of its implications, and that is not unfair to enforce. Independent legal advice for both parties, full financial disclosure, and signing well ahead of the wedding all improve the chances a court will follow it. A 2026 government consultation has proposed going further and making qualifying nuptial agreements genuinely binding, but that is not yet the law. This is general information, not legal advice on a specific agreement.
Sources
- Tozers Solicitors, “Pre-Nuptial Agreements in England and Wales: Are They Legally Binding?”
- GOV.UK / Ministry of Justice, “A fairer end to relationships” consultation
- legislation.gov.uk, “Matrimonial Causes Act 1973, section 25: Matters to which court is to have regard in deciding how to exercise its powers”
