Prenuptial vs Postnuptial Agreement
A prenuptial agreement is signed before marriage; a postnuptial agreement is signed during marriage. Neither is automatically legally binding in England and Wales, but following Radmacher v Granatino [2010] UKSC 42 the Supreme Court confirmed that courts will give decisive weight to nuptial agreements that meet the Radmacher requirements. This comparison explains when each is appropriate and what courts will look for.
Overview
Nuptial agreements — whether made before (prenuptial) or during (postnuptial) a marriage — allow couples to agree in advance how their finances should be divided if the marriage ends. England and Wales does not give nuptial agreements automatic legal force: they are not contracts in the strict sense and cannot oust the jurisdiction of the court to make financial remedy orders under the Matrimonial Causes Act 1973. However, since the Supreme Court's landmark decision in Radmacher v Granatino [2010] UKSC 42, the courts will give decisive weight to a nuptial agreement where it was freely entered into by both parties with a full appreciation of its implications and it is not unfair to hold the parties to it. The Law Commission recommended in 2014 that qualifying nuptial agreements should be made legally binding in statute, but no legislation has yet been enacted. In practice the Radmacher test means that a well-drafted nuptial agreement — with independent legal advice, financial disclosure, and reasonable provisions — is highly likely to be upheld on divorce. The key distinction between prenuptial and postnuptial agreements is timing: prenups are signed before the marriage; postnups are signed once the marriage has begun.
Side-by-Side Comparison
Prenuptial Agreement
Pros
- Signed before the emotional and financial stakes of marriage — generally easier to negotiate and less likely to be tainted by duress
- Particularly effective at protecting pre-marital assets, family wealth, and business interests from sharing on divorce
- Sets clear expectations before marriage — reduces conflict if the marriage breaks down
- Following Radmacher, courts give decisive weight to a properly executed prenup — an effective planning tool
Cons
- Cannot be signed too close to the wedding — signing fewer than 21 days before the ceremony may indicate duress and undermine enforceability
- Must be reviewed and updated if circumstances change significantly during the marriage (birth of children, major inheritance, business change)
- Does not bind the court — a judge retains discretion to depart if the agreement is unfair, particularly regarding children's needs
Best For
Couples where one or both parties have significant pre-marital wealth, family inheritances, business interests, or where there has been a previous marriage with existing financial orders or dependent children.
Postnuptial Agreement
Pros
- Can be made at any point during the marriage — useful where circumstances have changed since the wedding
- Often used to protect a windfall asset (inheritance, business sale proceeds) received during the marriage
- Can be used as part of a reconciliation agreement — recording financial terms if the parties have separated and wish to reconcile
- Same Radmacher weight applies — a well-drafted postnup is highly persuasive on divorce
Cons
- Greater scrutiny of consent and duress — courts are alert to the risk that one party was pressured into signing a postnup during a vulnerable period in the marriage
- Cannot override obligations to children — the court retains full jurisdiction to make orders for children regardless of the postnup
- As with prenups, must be kept under review — outdated provisions may be disregarded
Best For
Couples who did not make a prenuptial agreement but wish to protect newly acquired or inherited assets; couples reconciling after separation; those whose financial circumstances have changed substantially during the marriage.
Key Differences
Our Recommendation
Both prenuptial and postnuptial agreements are valuable financial planning tools that will be given decisive weight by a court if they meet the Radmacher requirements — full financial disclosure, independent legal advice for both parties, and terms that are not unfair. The earlier the agreement is made and the more carefully it is drafted, the more likely it is to be upheld. Always instruct separate specialist family law solicitors for each party.