Is It Too Late to Get a Postnuptial Agreement? Here’s What the Law in England and Wales Actually Says 

It’s a question we hear more often than you’d think, “We’re already married — is it too late to get a postnuptial agreement?” 

The short answer is no. If you didn’t sign a prenuptial before your wedding, or circumstances have changed since you did, a postnuptial agreement can still give you the clarity and protection you’re looking for. The law doesn’t close that door once the wedding’s happened. It just changes the name of the document. 

A postnuptial agreement does the same job, just later 

A postnup — works in almost exactly the same way as a prenup. It sets out how you and your spouse intend to divide your assets, property, savings, and other financial matters if the marriage were to break down. The only real difference is timing: a prenuptial agreement is signed before the wedding, a postnup afterwards. 

You can enter into a postnup at any point during a marriage. It doesn’t matter if you’ve been married six months or sixteen years. There’s no cut-off point, no deadline you’ve quietly missed, and no requirement that you have to act within a certain window after the ceremony. 

Why people come to us for a postnup 

In our experience, postnups tend to come up for a few common reasons: 

• You ran out of time before the wedding. Prenups ideally need to be signed well in advance of the big day, and life doesn’t always cooperate with that timeline. 

• Your circumstances have changed. An inheritance, a new business, the birth of a child, or a change in one partner’s income can all be reasons to put something in writing that reflects where you are now. 

• You’re giving the marriage a fresh start. Some couples use a postnup after a difficult period, as a way of rebuilding trust and removing uncertainty about “what happens if” going forward. 

None of these situations are unusual, and none of them mean you’ve left it too late. 

Will the court actually respect it? 

This is usually the real question underneath “is it too late?” — people aren’t just asking whether they can sign a postnuptial agreement, they want to know whether it will actually count for anything if things go wrong. 

Postnups are treated by the courts in broadly the same way as prenups. Agreements that are entered into freely, with a clear understanding of what they involve, are generally given significant weight — provided the outcome is fair. The court will want to see that: 

• Both of you received independent legal advice 

• There was full and honest disclosure of finances on both sides 

• Neither of you was pressured into signing 

• The agreement doesn’t leave either person, or any children, without reasonable provision 

Get those fundamentals right, and a postnuptial signed ten years into a marriage carries much the same weight as a prenup signed before the wedding. 

The only real time pressure is emotional, not legal 

While there’s no legal deadline for a postnuptial, we’d gently push back on waiting too long for a different reason. The best post nuptials are usually agreed calmly, when both partners are on the same page and thinking clearly about the future — not in the middle of a crisis, when trust is already strained and emotions are running high. If something has prompted you to start thinking about a postnuptial, that’s usually a good sign it’s worth having the conversation sooner rather than later, simply so it can be done thoughtfully rather than under pressure. 

Our take 

If you’ve been putting off a postnup because you assumed the window had closed, it hasn’t. The law in England and Wales doesn’t penalise couples for waiting — what matters is how the agreement is put together, not when in the marriage it happens. Done properly, with the right advice on both sides, a postnuptial can give you exactly the same peace of mind a prenuptial would have. 

If you’re considering a postnup and want to understand what it would involve for your specific circumstances, our family law team can talk you through it clearly, with no pressure and no jargon. 

Call us today to book a consultation with our family law team to find out whether a postnup is right for you.