You will often see that a prenuptial agreement should be “executed as a deed”. It sounds formal, and it is – but the idea is straightforward, and getting it right is an important part of making your agreement stand up. Executing as a deed is the final step that turns a carefully negotiated document into a properly completed one, and it removes a couple of technical arguments a challenger might otherwise reach for.
This guide explains what a deed is, why prenups are done as deeds, exactly what happens when you sign, and how it fits with the other formalities that protect your agreement.
What a deed is
A deed is a formal written document that the law treats as more serious and more solemn than an ordinary contract. To be executed properly as a deed by an individual, it generally needs to be:
- In writing;
- Clear on its face that it is intended to be a deed – the document says so;
- Signed by each person in the presence of a witness who then signs to confirm they saw it (attestation);
- Dated and delivered – “delivery” simply meaning the signer indicates they intend to be bound by it.
Those formalities come from the Law of Property (Miscellaneous Provisions) Act 1989. A well-prepared prenup will already contain the right execution and attestation wording, so in practice you just need to sign it correctly.
Why prenups are done as deeds
A prenup does not strictly have to be a deed, but executing it as one is best practice for two main reasons.
First, it removes any technical argument about consideration – the “something for something” that an ordinary contract needs. A promise made in a deed is binding even without consideration, so no one can later claim the agreement fails for want of it.
Second, and just as importantly, the formality signals intent. Going through the deliberate ritual of signing before a witness shows that both partners took the agreement seriously and meant to be bound by it. That supports a court giving it weight under the Radmacher principle, and it closes off a line of attack when someone tries to overturn the agreement.
What this means in practice
When you come to sign, the process is simple:
- Each partner signs the agreement in the physical presence of an independent adult witness.
- The witness then signs, and prints their name and address, to confirm they saw the signature.
- The agreement is dated.
It is a small step, but doing it correctly is part of what separates a robust agreement from a shaky one. For the full walkthrough, see how to sign a prenup, and for who can act as witness, see who can witness a prenup?
Does a prenup need notarising?
In England & Wales, no. Unlike some countries where a prenup must be signed before a notary, here the deed formalities – signature, an independent witness and a date – are what matter (see does a prenup need notarising?). Notarisation may be relevant if there is an international element, but for a purely domestic agreement it is not required.
Can a prenup be signed electronically?
This is a developing area. The safest route for a deed remains a “wet-ink” signature with the witness physically present and watching you sign – not signing afterwards on trust, and not by video. Electronic execution of deeds carries extra requirements and some uncertainty, so for a document you want to be as robust as possible, traditional signing is usually best (see signing a prenup electronically).
After signing
Once the deed is signed, witnessed and dated, store it safely with the disclosure schedule and any advice letters – those documents together are the evidence that the agreement was properly made (see storing your prenup and what happens after signing).
Common execution mistakes to avoid
A well-drafted, fair agreement can still be weakened by getting the signing wrong. The usual slips are easy to avoid:
- No witness, or the wrong witness. Each signature needs an independent adult witness – not your partner and not a beneficiary.
- The witness not actually watching. They must see the signature happen, not sign later on trust.
- Leaving the deed undated, which muddies when it was signed relative to the wedding.
- Signing far too close to the wedding, which invites a duress argument (see when to sign a prenup).
- Losing the signed original. Keep it safe with the disclosure and advice letters (see storing your prenup).
If in doubt, it costs nothing to sign a fresh copy correctly. A properly executed deed is one of the cheapest ways to make your agreement harder to challenge.
Deed versus simple contract: why the distinction matters
An ordinary contract needs “consideration” – each side must give something of value – and it can, in principle, be challenged for a lack of it. A deed sidesteps that entirely: a promise made in a properly executed deed binds the person who made it whether or not they received anything in return. For a prenup that matters, because the whole arrangement is often about one partner agreeing to give up claims rather than exchanging like for like.
By using a deed, you close off any argument that the agreement fails as a bare promise. There is also a subtler benefit: the extra solemnity of a deed underlines that this was a considered, deliberate act, not a casual note – which feeds directly into the Radmacher question of whether both partners meant to be bound. It is the difference between a document that looks like a serious legal instrument and one that looks like a scribbled understanding.
What the execution page actually looks like
You do not need to draft any of this yourself – a well-prepared agreement includes it – but it helps to know what you are signing. The execution block typically states that the document is “executed as a deed”, then gives each partner a signature line with, beneath it, an attestation section for the witness to sign and print their name, address and often occupation. There is a space for the date.
When you come to sign, you complete your line while the witness watches, the witness completes theirs, and the date goes in. That is the entire ceremony. The reason it is set out so formally is so that, years later, the page itself is evidence of exactly who signed, who saw them, and when – which is precisely what a court wants to see when deciding whether to give the agreement weight.
How the deed fits with everything else
Executing as a deed is the last of several steps, and it works best when the earlier ones are done too. Think of the finished bundle as: the agreement itself, setting out what you have agreed. The disclosure schedule showing what each partner owned; the advice certificates confirming each of you was advised; and the signed, witnessed, dated deed tying it all together. Kept safely (see storing your prenup), that bundle is a complete, self-contained record that the agreement was fair, informed and freely made. The deed is the signature that turns a plan into a completed act – but it is the whole bundle, not the deed alone, that makes the agreement hard to challenge.
Executing a prenup as a deed: the practical steps
Executing a prenup as a deed is simple in practice: the document states that it is a deed, each partner signs it in the presence of an independent adult witness who also signs, and it is dated. Those formalities (from the Law of Property (Miscellaneous Provisions) Act 1989) remove any argument about “consideration” and signal that both partners meant to be bound. A well-prepared agreement already contains the right wording.
The statute, clause by clause
Section 1 of the Law of Property (Miscellaneous Provisions) Act 1989 abolished the old rule that a deed had to be sealed and replaced it with three requirements for an individual. The instrument must make clear on its face that it is intended to be a deed, by describing itself as one or by saying it is executed or signed as a deed.
It must be validly executed, which for an individual means signed in the presence of a witness who attests the signature; a signature made alone and shown to a witness afterwards does not qualify. And it must be delivered as a deed, which the courts read as conduct showing the signer intends to be bound, in practice the dating and exchange of the signed originals.
The Law Commission's 2019 report on electronic execution confirmed that an electronic signature satisfies the first two requirements, provided the witness is physically present when it is applied.
The consideration point is the reason for going to that trouble. An ordinary contract needs each side to give something; a deed does not, so executing a prenup as a deed removes any argument that one partner's promises were unsupported. It also produces the document a court will want to see. Under Radmacher v Granatino the question is whether each party entered the agreement freely with a full appreciation of its implications, and a dated deed with two witnessed signatures, kept with the financial disclosure schedule and the advice letters, is the contemporaneous record that the formalities and the safeguards were observed together.
Prenup deed: FAQs
Does a prenup have to be a deed?
Not strictly, but executing it as a deed is best practice and removes technical arguments about the agreement (see how to sign a prenup).
Who witnesses a prenup deed?
An independent adult, not your partner and not someone who benefits (see who can witness a prenup?).
Does a prenup need to be notarised?
Not in England & Wales – the deed formalities are enough (see does a prenup need notarising?).
What is “consideration” and why does a deed avoid the issue?
Consideration is the exchange of value an ordinary contract needs; a deed is binding without it, so no one can argue the prenup fails for lack of consideration.
Can we sign the deed in different places?
Each partner can sign their own copy before their own witness – what matters is that each signature is genuinely witnessed in person.
Does the date on the deed matter?
Yes – the date shows when it was executed, which is relevant to signing in good time before the wedding.
Does a deed avoid the need for “consideration”?
Yes – a promise in a properly executed deed is binding even without the exchange of value an ordinary contract needs, which removes one technical line of attack.
Do postnuptial agreements need to be deeds too?
The same best practice applies – a postnup is usually executed as a deed for exactly the same reasons.
Create your prenuptial agreement online
UK Prenup lets couples in England & Wales create a prenuptial agreement online, with an independent family-law solicitor's advice before you sign: £750 for one of you, or £1,300 with a solicitor for each of you. See how it works or get started.
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.