What is a “post-nup”?

You may have heard of a pre-nuptial agreement, or “pre-nup”, but you might not have heard of a post-nuptial agreementor “post-nup”. These agreements seek to do the same thing that a pre-nup does – to agree the financial outcome of any future divorce between you and your spouse – but the difference is that the agreement is entered into after marriage rather than before it.

A post-nuptial agreement has the same legal effect as a pre-nuptial agreement: provided that it has been done properly (both parties have had independent legal advice, they are entering into it freely, and are fully aware of its implications), and it would not be unduly unfair to apply its terms at the time of divorce, then it will be upheld in the event of any future divorce. The court tend to give them more weight than a pre-nup because the fact they have been entered into demonstrates an even clearer intention to be held to it (i.e. there is no impending wedding day which does place pressure on parties to sign pre-nups)

Some post-nuptial agreements are entered into very soon after the marriage, because the couple had been engaged in discussions regarding a pre-nup but had not managed to sign the pre-nup before the wedding.  If a pre-nup is signed very close in time to the wedding, it is best practice to reinforce and confirm the parties’ agreement with a brief post-nup in exactly the same terms, so that neither party can claim later that the pre-nup should not be relied upon due to it being signed late.

If you already have a pre-nup, you might choose to review the terms of your pre-nup years into the marriage, and your revised agreement would be a post-nuptial agreement. A review might be conducted to ensure that the terms of your pre-nup are still appropriate and fair, in the context of your married life now. If your financial or personal circumstances change considerably, for example you have moved country, or your health or your children’s health has become a factor to consider, you should take legal advice to “sense-check” the terms of your pre-nup.

post-nuptial agreement

Many couples enter into a post-nuptial agreement without ever having had a pre-nup. Scenarios in which a post-nup might be the best approach include:

  • you are due to receive a large inheritance or gift, and you want to make sure that it would remain ring-fenced in the event of your divorce in future;
  • you have set up a business during the marriage, or a business that you already owned prior to the marriage has increased significantly in value, and you do not want the future and continuity of that business to be affected by any divorce;
  • you are about to buy a property, and you and your spouse are contributing unevenly to its purchase price, and you wish to record that in a divorce your respective interests in that property would be reflective of your contributions rather than 50% each; or
  • you are being named as the beneficiary of a trust, or you intend to set up a trust, and you want to be clear about how that trust (or your beneficial interest in that trust) should be treated in the event of a divorce.  

The only difficulty with post-nuptial agreements is that there can be limited incentive for the financially weaker party to enter into them. Therefore their negotiation needs to be handled sensitively. Of course, in order for the post-nup to be fair at the time of the divorce, and therefore for it to be upheld, it will need to ensure that the fundamental financial needs of the financially weaker party are met. You can therefore assure your spouse that the agreement will not leave them “high and dry” and instead it is being entered into for a specific reason. Your lawyers can guide you through how best to discuss the post-nup with your spouse and will ensure that the messaging between solicitors aligns with that.    

Unsigned Post-Nuptial Agreement Considered But Not Determinative

In the landmark case of Radmacher v Granatino [2010] UKSC 42, the Supreme Court stated that:
“The Court should give effect to a nuptial agreement that is freely entered into by each party with a full appreciation

of its implications unless in the circumstances prevailing it would not be fair to hold the parties to the agreement.”

In the recent case of WC v HC (Financial Remedies Agreements) (Rev1) [2022] EWFC 22, the Honourable Mr Justice Peel, sitting in the Family Court was asked to decide whether an unsigned post-nuptial agreement fell under Radmacher, in that it would be upheld unless doing so would result in unfairness, or disregarded altogether.

The conclusion was somewhere in the middle of the aforementioned extremes.

The wife felt under pressure during negotiations

The couple concerned were living in Switzerland when the husband (H) said he wanted a post-nuptial agreement as the wife (W) wanted the family to return to England for the children’s schooling. H told W he would not allow

her to move with the children without a post nuptial agreement being drafted and signed.

During the 2017 negotiations, W messaged a friend saying she felt “blackmailed…powerless…cornered … abused”.

On 22 August, W’s solicitors approved the post-nuptial agreement and the next day, H’s solicitors did likewise. The parties were due to sign the documents six days later, however, on the day, a doctor certified W was showing “true mental distress”, unconducive to “calm decision making”. W emailed H explaining she was worried about signing previously unseen Swiss documents. She said she would sign the English agreement but never did.

W subsequently moved to England with the children. The relationship broke down and divorce proceedings began.

Was the unsigned post-nuptial agreement enforceable?

Mr Justice Peel concluded that although W had been under pressure to sign the post-nuptial agreement there was no undue pressure.

“I am satisfied that although W and H were under pressure, W was not under undue pressure to enter into it. In almost every Pre or Post Marital Agreement one or other, or both, parties are under a degree of pressure, and emotions may run high. The collision of the excitement engendered by prospective marriage, and the hard realities of negotiating for the breakdown of such a marriage, can be acutely difficult for parties. Tension and disagreement may ensue. If, as here, one side of the family is applying pressure, the difficulties are accentuated. But in the end, each party has to make a choice and unless undue pressure can be demonstrated, the court will ordinarily uphold the agreement. In my judgment, W cannot so demonstrate here.”

Furthermore, W had received independent legal advice, therefore, the agreement could not be simply ignored. Indeed to do so would be contravening section 25 of the Matrimonial Causes Act 1973 as the court would not be considering the full circumstances of the case.

“Although not a strict Radmacher agreement, this was an agreement reached by the parties, with the benefit of legal advice, and upon full disclosure. Even though W did not sign it, in my judgment I am entitled to take it into account and attach such weight to it as I think fit. It is one of the factors, to be considered in the mix. The terms agreed … are relevant, albeit not determinative.”

Mr Justice Peel subsequently awarded W £7.45 million, which was about 60% of the total assets of £12.47 million which “approximates to that which was contained within the Post-Marital Agreement but goes beyond it so as to meet what I consider to be W’s needs judged against all the relevant factors.”

Concluding comments

This case illustrates two points:

a) The court sets the bar for undue influence relatively high. In cases involving significant wealth, especially family wealth on one side, a certain amount of pressure is to be expected. In fact, all negotiations involve pressure which is why it is vital to have independent legal advice from an experienced family law solicitor who can provide the pragmatic guidance required to protect their client’s best interests.

b) If the nuptial agreement satisfies the three-part test in Radmacher, namely that it was:

  1. freely entered into,
  2. both parties understood the agreement, and
  3. it is reasonable to hold both parties to the agreement

then it will be considered as forming part of the circumstances of the case, even if one party failed to sign the document.

This case does turn on certain specific facts, for example, Mr Justice Peel noted that W did not attempt to renegotiate the agreement and her solicitor had signed the document. The case may have been decided differently if these factors had not been present. However, for the agreement to fall completely outside Radmacher, W would have had to prove, on the balance of probabilities, that it was either not freely entered into, she did not understand the terms, or it was completely unfair to uphold the agreement.

Edwards Family Law is a niche London-based firm that deal with complex, high value and international family law. To find out more about financial dispute resolution, please phone +44 (0)20 3983 1818 or email contact@edwardsfamilylaw.co.uk. All enquiries are treated in the strictest confidence.


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