Form E and Post-nups: How Prior Agreements Affect Disclosure

I am Peter Johnson, senior partner at Alexander JLO. I advise high net worth individuals on the intersection of pre‑marital planning and the family court’s disclosure regime. Post‑nuptial agreements (post-nups) often sit at the heart of matrimonial finance disputes, yet many clients misunderstand how those agreements interact with Form E and the court’s duty to achieve fair outcomes. This article explains, in practical terms, how post‑nuptial agreements affect disclosure obligations under the law of England and Wales, how I prepare Form E where a post‑nup exists, and the strategies I use to protect legitimate commercial interests while meeting the court’s demand for full and frank disclosure.

Why post‑nuptial agreements matter for high net worth clients

High net worth clients use post‑nuptial agreements to record an agreed allocation of assets after marriage. They help clarify expectations, provide certainty, and preserve family wealth or business continuity. However, a post‑nup does not replace Form E or eliminate the duty to disclose. The court treats post‑nuptial agreements as an important factor, but it will only give effect to them if they meet legal standards and if the court considers enforcement fair in all the circumstances. Disclosure on Form E provides the factual foundation the court needs to evaluate whether the post‑nup should stand.

Legal framework: how courts treat post‑nuptial agreements

Since Radmacher v Granatino the courts in England and Wales have recognised the weight to be given to nuptial agreements provided they satisfy certain conditions. The same principles apply to post‑nuptial agreements. The court will consider:

– Whether the agreement resulted from free and informed consent without duress

– Whether both parties had reasonable knowledge of relevant financial information, or received full disclosure before signing

– Whether both parties had the opportunity to obtain independent legal advice

– Whether the agreement is substantively fair at the time it is relied upon, taking into account changed circumstances such as children’s needs or a significant change in financial position

These factors inform how I prepare Form E. The document must enable the court to answer these questions clearly and quickly.

Form E remains mandatory when a post‑nuptial agreement exists

A common client misconception is that a post‑nup obviates Form E. It does not. The court requires verified financial information to assess fairness, to test whether disclosure at the time of signing was adequate, and to determine whether any change in position justifies departing from the agreement. You must therefore file a complete, accurate Form E and supply supporting documents even where a post‑nup appears to resolve matters.

What the court will ask on Form E when a post‑nuptial agreement exists

When you file Form E in the context of a post‑nup the court will focus on:

– The financial landscape at the time the post‑nup was signed and whether the weaker party knew the material facts

– Whether the post‑nup was negotiated with independent legal advice for both parties

– Whether the post‑nup addressed foreseeable contingencies such as children, severe illness or business failure

– Whether the agreement was fair in light of subsequent events such as business growth, inheritance or significant disposals

I structure Form E and the supporting bundle to make these issues obvious. A clear narrative, linked exhibits and expert confirmation of valuation or provenance materially improve the court’s ability to give effect to a post‑nup where appropriate.

How I prepare Form E where a post‑nup exists — practical steps

1. Recreate the contemporaneous position at signing

I assemble documents that show the parties’ positions when the post‑nup was agreed. These include bank statements, share registers, trust deeds, tax returns and adviser letters that existed at that date. Demonstrating what each party knew then often proves decisive.

2. Gather evidence of independent advice

I obtain advice certificates or solicitor’s letters confirming that both parties had independent legal advice. If such documents do not exist I prepare witness statements that reconstruct the advice process and annex contemporaneous communications that corroborate the account.

3. Trace provenance of disputed assets

If the post‑nup seeks to exclude particular assets I trace their provenance. I show when funds were invested, whether they derived from premarital wealth, and whether any family settlements funded the acquisition. Documentary tracing reduces the risk that the court will characterise exclusions as attempts to defeat claims.

4. Document post‑nup changes

I map material changes since the post‑nup: business expansion or contraction, inheritances, significant gifts, and new liabilities. I quantify their effect and explain why particular changes should or should not alter the agreement’s outcome.

5. Prepare a concise evidential narrative

I draft a short, plain English narrative that links Form E entries to the post‑nup clauses and to the exhibits. Judges and opposing counsel value clarity. A one page timeline and a short exhibit map that cross references key documents often prevents unnecessary dispute.

6. Instruct valuation and forensic experts where required

Where valuation or provenance is contested I instruct valuers and forensic accountants early. Their reports support the evidential picture and reduce the chance of surprise at hearing.

Why full disclosure increases the chance that a post‑nup will be enforced

The court assesses whether a party signed a post‑nup with full knowledge of the other party’s circumstances. Where the stronger party can show contemporaneous disclosure, independent advice and fairness, the court will often uphold the agreement. Conversely, where disclosure was inadequate or one party lacked proper advice the court may depart from the terms of the agreement. Full disclosure therefore works in favour of enforceability.

Common post‑nup issues and how I deal with them

Issue: undisclosed trusts or offshore interests at the time of signing

Approach: I trace the trust funding and produce trustee correspondence and bank records to show whether those assets were known or deliberately hidden. If the trust predated the post‑nup I seek to demonstrate provenance and independence. If the trust arose later I show commercial reasons for its creation and provide contemporaneous advice records.

Issue: rapid transfers after signing

Approach: The court will suspect transfers that occur shortly before or after a post‑nup when they alter the distribution of assets. I obtain supporting documents showing commercial rationale, contemporaneous advice, and consideration if any. If transfers were legitimate business steps I produce board minutes, invoices and independent advice to support that claim.

Issue: substantial change in value of business assets

Approach: I instruct valuers to establish value at the post‑nup date and at present. I model realistic extraction scenarios and propose offsetting mechanisms such as deferred payments staged buyouts or pension adjustments. If growth arose from joint enterprise or marriage effort I ensure those factors appear in the overall needs analysis.

Issue: children’s needs that the agreement did not foresee

Approach: The court prioritises fairness for children. Where a post‑nup leaves a dependent party without adequate provision I recommend negotiated adjustments such as maintenance schedules, education provisions or housing arrangements. I present those options in Form E and in the negotiation bundle.

When a post‑nup is likely to be upheld — factors judges respect

Judges give weight to post‑nups that demonstrate:

– Clear, contemporaneous disclosure of material facts

– Independent legal advice for both parties, evidenced in writing where possible

– Procedural fairness in negotiation and signing, including adequate time to consider terms

– Reasonable outcomes that do not leave a dependent party in need without justification

– Commercial rationale for any structures relied upon, with documentary support

I prepare Form E and witness evidence to emphasise these factors. In my experience, a post‑nup that meets these criteria often forms the basis for an efficient settlement.

When the court may depart from a post‑nup — red flags I warn clients about

The court may refuse to enforce or may vary a post‑nup if:

– One party signed under duress or without meaningful advice

– The agreement resulted from material non‑disclosure of wealth or circumstances

– The agreement would produce manifest injustice today, for example by neglecting children’s reasonable needs

– There has been fraud or concealment in relation to assets the agreement sought to exclude

When these risks exist I advise clients to consider negotiated adjustments early to avoid expensive contested litigation.

Practical negotiation strategies where a post‑nup exists

Use the post‑nup as an anchor rather than a ceiling

I use the post‑nup as the starting point for negotiation and then factor in changes proven on Form E. Where the post‑nup provides a fair baseline, I negotiate limited adjustments rather than litigate over every point.

Offer structured solutions to bridge fairness gaps

If the court might find strict enforcement unfair I propose pragmatic remedies: deferred payments, targeted maintenance for children’s schooling, staged buyouts, or pension sharing. These solutions often preserve core intentions of the post‑nup while meeting statutory fairness tests.

Propose confidentiality mechanisms to protect sensitive information

Where the parties exchange sensitive commercial data I propose confidentiality rings, sealed exhibits and limited disclosure to experts. A carefully drafted confidentiality regime helps secure settlement without exposing trade secrets.

When to litigate rather than negotiate

I recommend litigation where the other side refuses reasonable adjustments that the evidence supports, makes false allegations of non‑disclosure, or seeks to rely on exaggerations of need. Contested hearings remain necessary when parties cannot bridge evidential disputes on provenance, valuation or advice.

Checklist: preparing Form E when a post‑nup exists

– Instruct specialist family law counsel like us promptly

– Gather contemporaneous documents predating and contemporaneous with the post‑nup signing

– Produce evidence of independent legal and financial advice where available

– Trace provenance of assets the post‑nup seeks to exclude using bank statements share registers and trust deeds

– Instruct valuation and forensic experts where timing or value is contested

– Prepare a concise narrative linking Form E entries to post‑nup clauses and supporting exhibits

– Propose confidentiality measures for commercially sensitive documents with an exhibit map and witness statement justification

– Consider negotiated concessions that address children’s needs liquidity issues or fairness concerns while preserving the agreement’s core

Practical examples that illustrate key points (anonymised)

Example 1: post‑nup upheld where disclosure existed

A client signed a post‑nup that excluded family investments. We produced contemporaneous bank transfers, solicitor’s advice notes and management accounts showing the investments pre‑dated the marriage. The court upheld the post‑nup and gave effect to the exclusion.

Example 2: post‑nup varied after concealed trust discovered

In another case the other party failed to disclose a trust interest at signing. Forensic accountants traced transfers from marital accounts into the trust. The court found that the non‑disclosure undermined informed consent and adjusted the settlement to reflect the concealed asset.

Final reflections — honesty, evidence and commercial sense

Post‑nuptial agreements offer valuable certainty for high net worth clients, but they operate within a legal framework that demands fairness and informed consent. Form E provides the evidential basis the court needs to evaluate any agreement. My approach blends candid disclosure with practical protection: prepare clear, well evidenced Form E entries, instruct experts early, protect genuinely sensitive commercial material through procedural means, and be prepared to negotiate fair adjustments where justice requires. That approach preserves commercial interests, reduces litigation risk and improves the chance that a post‑nup will be enforced.

If you have a post‑nuptial agreement and face separation we can arrange a confidential review. Together we will map your disclosure obligations, gather necessary evidence and prepare a Form E strategy that supports your business and personal objectives while meeting the court’s requirements.

Alexander JLO Solicitors are well aware that going through divorce can be very difficult. Whilst the implementation of no-fault divorce back in 2022 has made the legal process much simpler, there are times, especially in relation to financial matters, when input from an experienced solicitor is vital.

With that in mind we have developed a revolutionary new service which will ascertain whether or not it’s wise to have legal advice on finances when going through divorce. Simply called Form Easy it will assess your level and type of assets and determine if you qualify for a free, no-obligation consultation to discuss your case with us and decide on the best ways forward for you. Simply click the Form Easy button, or visit the page here, answer a few short questions and we will let you have our input on whether we can help. 

At Alexander JLO we have many years of experience of dealing with all aspects of family law and will be happy to discuss your case in a free no obligation consultation. Why not call us on +44 (0)20 7537 7000, email us at info@london-law.co.uk or get in touch via the contact us button and see what we can do for you?

This blog was prepared by Peter Johnson on 24th November 2025 and is correct at the time of going to press. With over forty years of experience in almost all areas of law Peter is happy to assist with any legal issue that you have. He is widely regarded as one of London’s leading divorce lawyers. His profile on the independent Review Solicitor website can be found Here.

To follow up on any of the above please contact Guy Wilton of our family department. Guy has wide experience of acting for the firm’s clients, their family and their businesses. Guy’s experience as a lawyer started in the Northern and Welsh Circuits, including the Liverpool Courts, where he represented numerous clients after being called to the Bar, before opting to join Alexander JLO in 2017 and qualifying as a solicitor in 2024. He is a highly experienced family lawyer with a particular interest in financial remedy proceedings and child contact disputes.

Guy’s profile on the independent Review Solicitor website can be viewed here.