The single biggest factor in whether a court follows a prenup is fairness. A fair agreement is given real weight; an unfair one can be set aside. The good news is that fairness is something you can build in deliberately — and doing so does not weaken your protection, it strengthens it. This guide sets out the practical steps that make a prenup fair, and explains why a fair agreement is a stronger one.
1. Both partners disclose everything
Full and frank financial disclosure from both of you is the foundation. You cannot fairly agree about money you do not know exists, so a complete disclosure schedule is step one. Leaving assets off the table — or hiding them — is one of the quickest ways to have an agreement overturned.
2. Both take independent advice
Each partner having their own legal advice shows you both understood the agreement and were not pressured into it — two of the things that most often make an agreement look unfair if they are missing. It need not be expensive: even a review of a finished draft by a solicitor for each partner ticks this box (see do both partners need a lawyer?).
3. Provide for needs (and children)
This is the line a prenup cannot cross: it must not leave a partner, or any children, in real need. An agreement that protects specific assets while still providing fairly for both partners is far more robust than one that tries to give one person everything. Provision for children is always for the court, and no agreement can write that out (see are prenups legally binding?).
4. Sign in good time, freely
Sign well before the wedding — the Law Commission suggested at least 28 days ahead, and ideally months — so there is no suggestion of last-minute pressure or duress. A prenup pushed under someone’s nose days before the ceremony is far easier to challenge (see last-minute prenups).
5. Keep it current
Fairness is judged at the time of divorce, not the wedding. A review clause lets you update the agreement as life changes — children, a house, a big shift in fortunes — so it stays fair, and effective, for the long term. An agreement that still reflects the couple’s reality is one a court is far more comfortable following.
Fairness and protection go together
It is a common myth that a "fair" prenup must be a weak one that gives away your assets. The opposite is true. A one-sided agreement is the kind a court sets aside; a fair one is the kind it enforces. Fairness is what makes your protection durable. The aim is not to strip your partner of everything, but to ring-fence what genuinely matters to you while still meeting both partners’ needs — see when is a prenup unfair? for where the line falls.
How to make a prenup fair: the five steps
Making a prenup fair comes down to five steps: full disclosure from both partners, independent legal advice each, terms that meet everyone’s needs (including any children’s), signing in good time without pressure, and a review clause to keep it fair as life changes. A fair prenup is not a weaker one — it is the kind a court will actually follow, which is the whole point of having one. These steps run right through our guide to what to include in a prenup.
The legal backdrop: why fairness decides everything
Fairness is not a vague ideal here; it is the hinge the whole system turns on. A prenup is not automatically binding in England & Wales. Since Radmacher v Granatino (2010), the courts will give effect to a freely entered agreement, with each party understanding its implications, unless in the circumstances it would not be fair to hold them to it. That single sentence is why every step in this guide matters: each one is really an answer to the question "is this fair?". Behind it sits the court’s discretion under the Matrimonial Causes Act 1973, which cannot be ousted by any agreement, and two firm backstops — needs, and the welfare of any children, which is always paramount. The Law Commission proposed a new category of binding "qualifying nuptial agreements" back in 2014, but that has not become law, so this fairness-based approach remains the position today.
Two kinds of fairness
It helps to separate two things a court looks at. The first is procedural fairness — was the agreement made properly? That covers disclosure, independent advice, good timing and the absence of duress. The second is substantive fairness — are the terms themselves fair, and do they meet needs? An agreement can be strong on one and weak on the other: a beautifully executed prenup with lavish disclosure and advice will still be reopened if its terms would leave a partner destitute, and perfectly reasonable terms can be undermined if one partner was pressured into signing days before the wedding. A robust prenup needs both. See when is a prenup unfair? for where the line falls in practice.
A worked example
Imagine a couple where one partner has substantial pre-marital wealth and the other has little. A fair prenup might ring-fence the wealthy partner’s pre-marital assets and any future inheritance, while still ensuring the less wealthy partner has a home and enough to live on if the marriage ends — and providing more generously the longer the marriage lasts or if there are children. Contrast that with a prenup that leaves the less wealthy partner with nothing after fifteen years and two children. The first protects real wealth and is likely to be upheld; the second protects nothing, because a court will simply set it aside as unfair. The paradox at the heart of prenups is that the fair agreement is the strong one.
A quick fairness self-check
- Did both partners disclose everything, in writing?
- Did each have the chance to take independent advice?
- Was it signed in good time — ideally months, at least 28 days — before the wedding?
- Does it meet both partners’ needs, and any children’s, even in a worst-case scenario?
- Is there a review clause to keep it fair as life changes?
If you can answer yes to all five, your agreement stands on firm ground. A no to any of them is a signal to fix that element before signing — it is far cheaper now than in a courtroom later.
Fairness is not the same as an equal split
A frequent misunderstanding is that a "fair" prenup must divide everything down the middle. It does not. Fairness in this context means the agreement is honestly made and does not leave either partner (or any child) in real need — it does not mean each partner walks away with an identical share. A prenup can legitimately ring-fence a flat one partner bought years before the marriage, an inheritance, or a stake in a family business, and still be entirely fair, precisely because those assets were never the fruit of the marriage. The distinction between matrimonial and non-matrimonial property is what lets a fair agreement protect real wealth. What tips an agreement into unfairness is not that it is unequal, but that it leaves a partner unable to meet their reasonable needs — a different test entirely.
Building in fairness when circumstances are unequal
The hardest agreements to make fair are those where one partner has far more than the other, or where one will give up income to raise children. Here the practical answer is to build in provision that grows with the marriage: a modest settlement for a short, childless marriage, and a more generous one the longer the couple are together or if children arrive. Housing is usually the first thing to secure — a court will look hard at whether the less wealthy partner, and any children, have somewhere to live. Recording that a stay-at-home parent will be properly provided for, rather than penalised for stepping back from work, is one of the clearest signs of a fair agreement. Pairing this with a review clause means the provision can be revisited as caring roles and incomes change.
Making it feel fair to both partners
Fairness in the legal sense and fairness as each of you experiences it are built the same way. Involve both partners from the start rather than presenting one with a finished document; be open about everything, so that the disclosure schedule is a shared exercise and not a test; provide for both of you, including a partner who steps back from work or has less to bring in; and get separate advice, so that each of you hears from someone acting only for you. A prenup that both partners helped to write, and both understood, is the one that feels balanced at the wedding and reads as balanced to a court years later. Fair does not mean an equal split of everything; it means terms that meet both partners' needs and that neither of you would be embarrassed to defend.
Making a prenup fair: FAQs
What makes a prenup fair?
Disclosure, independent advice, needs being met, good timing and a review clause (see what to include).
Does a fair prenup still protect my assets?
Yes — fairness and protection go together; one-sided terms are what fail (see when is a prenup unfair?).
How long before the wedding should a prenup be signed?
At least 28 days, and ideally several months, to avoid any suggestion of pressure (see when to sign a prenup).
Can a prenup be unfair even if both partners signed it?
Yes — signing does not make it fair; a court can still set aside terms that leave a partner in need (see can a prenup be overturned?).
Do both partners really need their own solicitor?
It is not a strict legal requirement, but independent advice for each is one of the safeguards that makes an agreement more likely to be upheld (see independent legal advice).
What is the difference between procedural and substantive fairness?
Procedural fairness is about how the agreement was made (disclosure, advice, timing, no duress); substantive fairness is about whether the terms themselves are fair and meet needs. A strong prenup needs both.
Are prenups automatically binding if they are fair?
No — a prenup is never automatically binding here; a court gives a fair, properly made agreement significant weight but keeps its discretion under the Matrimonial Causes Act 1973 (see are prenups legally binding?).
Can I make my prenup fairer after we are married?
Yes — you can update it by a postnup, using the same safeguards (see changing a prenup after marriage).
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.