Pre-Nups and Post-Nups : What You Need to Know

Talking about pre-nups or post-nups might not feel very romantic, but they’re becoming more normal—and for good reason. They can offer clarity, protection, and peace of mind.

First: how the law sees these agreements

In England and Wales, pre-nuptial and post-nuptial agreements are not automatically legally binding. Courts still make final decisions under the Matrimonial Causes Act 1973, meaning a judge can change things if needed for fairness. But the landmark Supreme Court case Radmacher v Granatino (2010) changed everything: it confirmed that courts should generally respect a nuptial agreement if both parties entered it freely, understood it fully, and the result wouldn’t be unfair.

Today, courts give significant weight to well-prepared agreements—especially those with full financial disclosure and independent legal advice.

The Pros

Clarity about finances A well-drafted agreement helps couples know where they stand. Courts take them seriously when they meet the Radmacher criteria, so they can really shape outcomes if a relationship ends.

Protection of assets They’re especially useful where one partner has pre-marital property, inheritance, or a family business. These are common areas nuptial agreements can cover.

Less conflict later Decisions made calmly in advance can mean fewer disputes if things do break down. Courts often uphold agreements that feel fair and transparent, which can reduce legal wrangling.

Good financial conversations It might feel awkward, but talking openly about money upfront can strengthen a relationship and help avoid surprises.

The Cons

They can feel unromantic Suggesting a pre-nup can feel uncomfortable and may give the wrong impression unless handled sensitively.

Not automatically binding Because courts have the final say, an agreement won’t stand if it’s unfair or if someone wasn’t properly advised. Recent cases show courts will set aside agreements signed under pressure or without proper disclosure (e.g., a 2025 case where a wife successfully challenged a post-nup).

They need proper legal advice For an agreement to carry weight, both partners must receive independent legal advice and provide full disclosure—meaning time and cost.

Life changes Children, health issues, or major financial shifts can all affect whether an agreement still seems fair. Courts will prioritise needs and children’s welfare over any contract.

Final Thoughts

Pre-nups and post-nups don’t guarantee outcomes—but they do matter. When done properly, they can provide structure, protection, and clarity. Think of them less as preparing for the worst and more as planning responsibly—together.