When you sign a prenup matters almost as much as what it says. Sign too close to the wedding and a court may give it less weight; sign in good time and you remove one of the main grounds for challenging it. Timing is one of the few things entirely within your control, so it is worth getting right. This guide explains why the date you sign matters, where the well-known "28 days" rule comes from, and what to do if the wedding is already close.
Why timing matters
One of the most common ways a prenup is attacked is the argument that a partner signed under pressure — for example, faced with calling off a wedding that is days away, with guests booked, family arriving and deposits paid. In that moment, the argument runs, they had little real choice but to sign. Signing well in advance defuses that argument completely: it shows the agreement was entered into freely, with time to reflect, which is central to it being upheld (see are prenups legally binding?). Good timing also gives you space to do the other things properly — disclosure and independent legal advice — rather than rushing them.
Where the "28 days" rule comes from
In its 2014 report Matrimonial Property, Needs and Agreements, the Law Commission recommended that an agreement should be signed at least 28 days before the wedding as one of the safeguards for a "qualifying nuptial agreement" that would be binding by statute. That reform hasn't become law, so the 28 days is not a legal requirement — but it has become the widely used rule of thumb, and courts and solicitors treat it as good practice. In short: sign at least a month before the wedding, and ideally more. See qualifying nuptial agreements explained.
When is the best time to sign a prenup?
The best time to sign a prenup is as early as you comfortably can once you are engaged — ideally two to three months before the wedding, and at least 28 days before as a minimum. Signing early gives both partners time to gather their finances, take independent advice and consider the terms without pressure, which is exactly what makes the agreement robust. Leave it to the final fortnight and you risk both a rushed document and a weaker one. A rough timeline:
- On engagement / 3+ months out: raise it, agree the broad approach, start gathering financial information.
- 2–3 months out: exchange disclosure, draft the agreement, each take independent advice.
- At least 28 days out: sign and witness the final agreement as a deed.
See how long a prenup takes to plan backwards from your date.
What if the wedding is very soon?
If there isn't time to do it properly before the wedding, it is usually better to make a postnuptial agreement shortly afterwards than to rush a prenup in the final days. A calm postnup made after the honeymoon can carry more weight than a prenup signed the night before the wedding. If you do proceed close to the date, at least make sure disclosure and advice still happen — see last-minute prenups.
When to sign a prenup: FAQs
Is the 28-day rule a legal requirement?
No — it is best-practice guidance from the Law Commission, not current law, but it is widely followed (see qualifying nuptial agreements).
Can you sign a prenup the week of the wedding?
You can, but it carries far more risk of being challenged as signed under pressure — a last-minute prenup is best avoided.
How early is too early to sign a prenup?
There is no "too early" — signing months ahead is ideal, and you can keep it current with a review clause.
Does the prenup have to be signed before the wedding at all?
Yes — an agreement signed after the wedding is a postnup, not a prenup, though it is treated on similar principles.
Can we sign at different times?
Both partners need to sign, each in front of a witness; it is fine if that happens a little apart, provided both do so freely and in good time before the wedding.
Create your prenuptial agreement online
UK Prenup lets couples in England & Wales create a clear, fair prenuptial agreement online from £199, with your document generated instantly as a PDF. 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.