“Full and frank financial disclosure” sounds like jargon, but the idea is simple: before you both sign a prenup, you each lay your finances on the table. It is one of the foundations of an agreement a court will give weight to – because you cannot fairly agree to something if you do not know what you are agreeing about. Disclosure is what turns a piece of paper into a real, informed bargain.
This guide explains why disclosure matters so much, exactly what each partner should disclose, how to record it, and the common mistakes that let disclosure – and with it the whole agreement – unravel later.
Why disclosure matters
The principle from Radmacher v Granatino (2010) is that each partner must enter the agreement with a full appreciation of its implications. You cannot appreciate what you are giving up if you do not know what the other person has. So if one partner concealed a property, a business interest or a large savings pot, the other never had that full appreciation – and a court can disregard the agreement as a result. In this sense, disclosure protects the agreement itself as much as it protects your partner: it is the evidence that the deal was informed and fair. See Radmacher explained for where this principle comes from.
What each partner should disclose
Disclosure should cover everything of real financial significance on both sides of the balance sheet – what you own and what you owe:
- Property and land – homes, buy-to-lets, plots, with rough values and any mortgages.
- Savings, investments and shares – bank accounts, ISAs, funds and shareholdings or stock options.
- Pensions – often the most valuable and most overlooked asset; record the cash-equivalent transfer value (CETV) where you can (see protecting a pension).
- Business interests – companies, partnerships and professional practices you own or part-own.
- Significant personal assets – vehicles, art, jewellery and other valuables of real worth.
- Income from all sources – salary, dividends, rental income, self-employment.
- Debts and liabilities – mortgages, loans, credit cards and business borrowing (see pre-marriage debts).
- Expected inheritances or trust interests, where they are known (see protecting a future inheritance).
This list overlaps closely with what a prenup should cover – the disclosure schedule is effectively the financial backbone of the document. For a fuller run-through, see the information needed for a prenup.
How to do it properly
Set out each partner’s finances in a written schedule attached to the agreement, so there is a clear, dated record of what was shared. A few practical pointers:
- Use honest, approximate values. The point is a fair, complete picture, not a forensic audit priced to the penny (see how to value your assets).
- Do it early. Disclosure takes a little time to gather – another reason to start well before the wedding.
- Attach it to the agreement. A standalone disclosure schedule that both partners sign is the cleanest evidence that the exchange happened.
- Keep copies. Store the schedule with the signed agreement and any advice letters (see storing your prenup).
Doing this alongside an honest conversation about money is also one of the healthiest things a couple can do before marriage – it is exactly the sort of financial groundwork covered in do you need a prenup?
How much detail is enough?
The test is whether your partner has enough information to understand, in broad terms, what they are agreeing to give up or share. You do not need audited accounts or professional valuations for everything – a realistic figure and a short description usually suffice. For a business or a large pension, a more considered valuation is sensible because those numbers drive the fairness of the deal. What matters is that nothing significant is hidden and nothing is deliberately understated. A partner who is later shown to have “lowballed” a key asset gives the other a ready-made ground to challenge the agreement.
What happens if disclosure is incomplete
Poor or dishonest disclosure is one of the leading reasons a court gives a prenup little or no weight. In Ipekçi v McConnell (2019) the lack of proper disclosure was part of why the agreement was disregarded. If a hidden asset comes to light on divorce, the partner who was kept in the dark can argue – often successfully – that they never had a full appreciation of the bargain (see what makes a prenup invalid and hidden assets in a prenup). Full disclosure is, quite simply, the cheapest insurance you can buy for your agreement.
Disclosure when one asset is hard to value
Some assets do not come with a neat price tag, and that is where couples most often worry. A private business, a stake in a partnership, a share of a family trust, or a portfolio of crypto can all be genuinely difficult to pin down. The answer is not to give up and leave them out – that is exactly what sinks an agreement – but to disclose them honestly with your best available estimate and a note explaining the basis. For a business, that might mean the latest accounts and a broad valuation range rather than a single figure (see prenups for business owners). For a pension, quote the cash-equivalent transfer value from your provider. For shares or stock options that may vest in future, describe the scheme and the current position. The court is not looking for perfection; it is looking for candour. A partner who says “here is roughly what I have and how I worked it out” is on far safer ground than one who stays silent and hopes the question never comes up.
A short worked example
Imagine one partner owns a flat bought before the marriage, worth around £280,000 with a £120,000 mortgage, plus a workplace pension with a transfer value of about £90,000. The other partner has £15,000 in savings and £6,000 of student debt. Setting all of that out in a short schedule – four lines each, with approximate figures – is all it takes to give both partners a “full appreciation” of the picture. Neither had to pay for a formal valuation; honest round numbers did the job. If, years later, one of them argues they never knew about the flat or the pension, the signed schedule is a complete answer. That single page is often the difference between an agreement a court gives weight to and one it sets aside.
Keeping disclosure honest and up to date
Disclosure is a snapshot taken at the time you sign, and finances move on. If years pass between signing the prenup and any divorce, the numbers will inevitably have changed – but that does not invalidate the original disclosure, which was honest when made. What matters is that nothing was concealed at the time. Where the picture changes dramatically – a business is sold, a large inheritance arrives, one partner’s circumstances transform – that is the moment to revisit the agreement, ideally under a review clause, refreshing disclosure as you go. Treating disclosure as a one-off box-tick, never to be looked at again, is a common mistake; treating it as a living record that you update on big life events is what keeps an agreement current and robust.
Financial disclosure for a prenup: getting it right
Good financial disclosure for a prenup is honest, complete and written down. List each partner’s property, savings, pensions, business interests, income and debts in a schedule attached to the agreement, with rough values rather than penny-perfect figures. That schedule is the evidence that both partners understood what they were agreeing to – which is exactly what protects the agreement if it is ever questioned.
How much the law demands, and what happens without it
"Full and frank" is the phrase from divorce litigation, where each spouse must disclose everything; for a prenup the Law Commission chose a lower and more practical standard. At paragraph 6.91 of its 2014 report it recommended that a qualifying nuptial agreement require disclosure of material information about the other party's financial situation, and at paragraph 6.88 it explained that this means information that would affect the decision to sign, not a valuation of every possession. A schedule that gives honest, dated figures for the assets that matter meets that standard.
The cases show the two ends of the scale. In Versteegh v Versteegh the Court of Appeal upheld an agreement made with no disclosure at all, because the judge found the wife had known the shape of her husband's finances and understood the agreement; disclosure is evidence of understanding rather than an end in itself. At the other end, an undisclosed asset of real value is the fact pattern in which a court finds that a partner signed without the full appreciation of the agreement's implications that Radmacher v Granatino requires, and the agreement is then given little weight in respect of that asset or at all. Section 25 of the Matrimonial Causes Act 1973 also requires the court, at the divorce, to consider all the resources each party has, so an asset hidden at the prenup stage surfaces later anyway, with the concealment counting against the partner who hid it.
Financial disclosure: FAQs
What happens if you do not disclose everything?
Hiding assets is one of the quickest ways to see a prenup set aside, because the other partner never had a full appreciation of what they agreed to (see hiding assets in a prenup).
Do you need exact valuations?
No – honest, approximate figures are fine for most assets, with a more careful valuation for big-ticket items like a business or pension (see how to value your assets).
Do you disclose debts as well as assets?
Yes – both sides of the balance sheet. Debts each partner brings in are part of the picture (see pre-marriage debts).
Should disclosure be attached to the prenup?
Ideally yes – a signed disclosure schedule attached to the agreement is the clearest possible record.
Do you have to disclose future inheritances?
Where a future inheritance is known and likely, it is sensible to mention it (see protecting a future inheritance), even if the amount is uncertain.
Does full disclosure make a prenup binding?
Not on its own – it is one of several safeguards, alongside advice, fair terms and proper signing (see are prenups legally binding?).
How do you disclose a business that is hard to value?
Give your best estimate with the latest accounts and a note of how you reached it, rather than leaving it out – candour matters more than a precise figure (see prenups for business owners).
Do you need to update disclosure over time?
The original disclosure stays valid as an honest snapshot, but if your finances change dramatically it is wise to refresh it when you review the agreement.
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UK Prenup is not a law firm and does not provide legal advice. A prenuptial agreement in England & Wales is not automatically binding, and both partners should take independent legal advice before signing.