No — a prenup does not automatically expire, unless it specifically includes a “sunset clause” that ends it after a set time or event. Left alone, a prenuptial agreement keeps running indefinitely. But there is an important second half to the answer: even though it never formally expires, a prenup can quietly lose its force if it becomes unfair over the years — because a court tests fairness at the date of the divorce, not the date of the wedding.
A prenup has no built-in end date
There is nothing in the law of England & Wales that switches a prenup off after a certain number of years. It is not like a passport or an MOT. Once it is signed as a deed, it stays part of your financial picture until you actively change it or a court declines to follow it. So a prenup you signed a decade ago is, in principle, still very much alive (see is my old prenup still valid?).
The one exception: a sunset clause
Some couples deliberately build in an expiry date using a sunset clause. This says the agreement will fall away automatically after a set period — say ten years — or on a defined event, such as the birth of a child. A sunset clause is useful where partners feel the case for keeping assets separate weakens the longer they are married and the more their lives merge. If your agreement contains one, that is the only way it truly “expires” on its own. If it does not, it does not.
It stays in place — but fairness is judged later
Here is the subtlety that trips people up. A court assesses a prenup’s fairness at the time of the divorce, not the wedding day. An agreement that made perfect sense years ago can look unfair after life moves on. Common examples include:
- Children arriving, so that provision which once seemed fair now leaves a parent and children without enough (see prenups and children).
- One partner giving up work to raise a family, changing the balance of needs.
- A dramatic change in finances — a business succeeding or failing, an inheritance, illness or redundancy.
- A very long marriage, where the court gives more weight to sharing than it might in a short marriage.
An agreement that has drifted into unfairness carries less weight, even though it has not technically expired (see are prenups legally binding? and when is a prenup unfair?).
How to keep it effective
The practical fix is a review clause: a commitment to revisit the agreement at set intervals or after major life events. When you review it, you update the terms — usually by making a fresh postnuptial agreement — so that it still reflects your real circumstances. A review clause is not about expecting the agreement to fail; it is about keeping it current and fair, which is exactly what keeps it effective (see what to include in a prenup and changing a prenup after marriage).
Sunset clause vs review clause
| Sunset clause | Review clause | |
|---|---|---|
| Effect | Agreement ends automatically | Agreement is revisited and updated |
| Trigger | A set date or event | Set intervals or life events |
| Result | You may be left with no agreement | You keep a current, fair agreement |
Most couples are better served by a review clause than a sunset clause, because it preserves the protection rather than removing it.
Does a prenup expire if you remarry the same person, or marry abroad?
A couple of specific situations are worth addressing, because they cause confusion. If a marriage ends and the same couple later remarry, the original prenup does not simply carry over to the new marriage — it related to the first one. Sensible practice is to make a fresh agreement for the new marriage rather than assume the old paperwork still applies. Similarly, if you signed a prenup and then married abroad, the agreement does not “expire” because of where the ceremony took place, but questions of which country’s law applies can become complex, so it is worth taking advice (see international prenups and getting married abroad with a prenup). In both cases the theme is the same: it is not the passage of time that undoes an agreement, but a change in the circumstances it was written for.
A worked example of “drift”
Imagine a couple who signed a prenup at 30, when neither had children and both worked full time. The agreement kept each partner’s salary and savings separate, which felt perfectly even-handed at the time. Fifteen years later they have two children, and one partner gave up a career to raise them. If the marriage ended now, holding that partner to the original terms could leave them without a home or income, while the other kept everything they earned throughout the marriage. The agreement never expired — but a court assessing fairness today might give it far less weight, because it no longer reflects the life the couple actually built (see the needs principle and prenups and the stay-at-home parent). This is exactly the “drift” a review clause is designed to catch.
What a sunset clause actually looks like
If you do want your agreement to end on its own, a sunset clause needs to be drafted with care so there is no doubt about when it bites. A well-drafted clause spells out:
- The trigger — a specific anniversary (for example, the tenth) or a defined event such as the birth of a first child.
- What happens next — whether the agreement simply falls away, leaving you to divide finances under the ordinary law, or whether you commit to making a fresh agreement at that point.
- Any interim protections — for instance, keeping certain inherited assets ring-fenced even after the rest of the agreement ends.
The risk of a bare sunset clause is that you are left with nothing when it expires, so many couples pair it with a promise to revisit rather than simply switch off (see prenup sunset clauses and what to include).
When should you look at your agreement again?
Even without a formal clause, a few life events are natural prompts to check that your prenup still fits:
- Having a child, which changes what is fair for both partners (see prenups and children).
- Buying a home together, especially if it becomes the family home (see buying a house together).
- A major change in wealth — a business succeeding, an inheritance, redundancy or illness.
- A long passage of time, since the longer a marriage lasts, the more a court leans towards sharing (see short marriages and divorce).
Reviewing does not mean the agreement failed; it means you are keeping it alive and fair, which is what keeps it strong (see is my prenup still valid?).
So does a prenup expire?
To put it simply: a prenup does not expire on its own. It keeps running indefinitely unless you wrote in a sunset clause that ends it after a set time or event. What changes over the years is not the agreement’s existence but its weight — because a court tests fairness at the date of divorce, an agreement that has become unfair can carry less force. A review clause is the practical fix, keeping it current rather than letting it drift.
Frequently asked questions
Does a prenup have a time limit?
Only if it contains a sunset clause. Otherwise there is no time limit (see prenup sunset clause).
How do you stop a prenup going out of date?
Add a review clause and update it via a postnup when life changes (see prenup review clause).
Is a 10-year-old prenup still valid?
It does not expire with age, but check it is still fair for your current life (see is my prenup still valid?).
Does having children make a prenup expire?
No, but it can make an old agreement look unfair, which reduces its weight (see prenups and children).
Can I set my prenup to expire on purpose?
Yes — that is exactly what a sunset clause does (see prenup sunset clause).
What happens if a prenup becomes unfair?
A court can give it less weight or decline to follow it, which is why keeping it current matters (see can a prenup be overturned?).
Create your prenuptial agreement online
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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.