A “poor man’s prenup” is the idea that you can protect your assets simply by keeping everything in your own name and your finances separate — without ever making a formal agreement. It is a popular notion, but it is not a reliable substitute for a real prenup. The instinct behind it is sound — keeping things clearly separate is genuinely good practice — but on its own it does far less than people assume, because it misunderstands how a divorce court actually works.
Why the “poor man’s” approach falls short
The critical point is this: on divorce, a court looks at the whole financial picture and can share assets regardless of whose name they happen to be in. Legal ownership is only the starting point, not the finish. If meeting one partner’s reasonable needs requires dividing an asset held solely in the other’s name, the court can order exactly that (see how assets are divided on divorce and what happens without a prenup). Keeping finances separate does not put them beyond the court’s reach.
What keeping things separate does help with
To be fair to the idea, keeping finances separate is not worthless. It helps in two ways:
- It avoids “mingling” — where separate money gets mixed into joint pots and loses its identity, making it harder to argue it was ever separate (see joint vs separate property).
- It keeps a clearer evidential trail of what each partner brought in, which is useful if the question ever arises.
But these are supporting measures, not protection in themselves. They make a good prenup work better; they do not replace one.
The real thing is now genuinely affordable
The “poor man’s” version exists mainly because people assume a proper prenup is prohibitively expensive. That is out of date. While a solicitor-drafted agreement can run into four figures, an online agreement can now be made for a fixed, modest fee — giving you a clear, evidenced, properly executed agreement rather than a hopeful assumption (see how much a prenup costs). And against the cost of a contested divorce, a prenup is almost always far cheaper.
Poor man’s prenup vs a real prenup
| Keeping things separate only | A proper prenup | |
|---|---|---|
| Stops a court redistributing assets | No | Given significant weight |
| Records your intentions in writing | No | Yes |
| Backed by disclosure and advice | No | Yes |
| Cost | Free, but weak | Modest fixed fee online |
Where the idea comes from — and why it persists
The “poor man’s prenup” has stuck around for two reasons. The first is cost: for years a properly drafted agreement meant a solicitor’s bill running into four figures, so keeping things in your own name looked like a free alternative. The second is a genuine but partial truth — that keeping money separate really does help. Both reasons contain a grain of sense, which is why the myth is so durable. The problem is that it overreaches: it takes something that is a useful supporting habit and treats it as complete protection, when the two are very different things. Understanding exactly where the idea holds and where it breaks down is the key to not relying on it too far (see how much a prenup costs).
A worked example of why name-only protection fails
Suppose one partner keeps a £250,000 flat and their savings entirely in their sole name throughout a fifteen-year marriage, never adding the other to anything. They assume this keeps it all safe. The marriage ends, and the other partner — who gave up work to raise the couple’s children — has little of their own and nowhere to live. A court looks at the whole picture and the reasonable needs of both partners and the children, and it can order the flat sold or a lump sum paid, no matter whose name is on the deeds (see what happens to the house and how assets are divided). The “kept it in my name” strategy achieves nothing against that, because sole ownership was never the obstacle the partner imagined it to be.
What a real prenup adds that separation alone cannot
A properly made prenup does the things keeping-things-separate simply cannot. It records, in writing, that you both intend certain assets to stay separate — an intention a court gives real weight to under Radmacher v Granatino (2010). It is backed by full disclosure and independent advice, so neither partner can later say they did not understand. And it sets fair terms that address both partners’ needs, which is what makes a court willing to follow it rather than override it. None of that exists in a bare arrangement of separate accounts (see what makes a prenup invalid). The agreement turns a hopeful assumption into an evidenced, considered plan.
The sensible combination: do both
The most robust approach is not to choose between them but to use both together. Make a proper prenup and keep clearly separate assets genuinely separate, out of joint accounts, so they are never mingled into the shared pot. The good financial hygiene reinforces the agreement, and the agreement supplies the legal weight the hygiene lacks on its own (see protecting savings with a prenup). Because an online agreement now costs only a modest fixed fee, the old excuse for settling for the “poor man’s” version has largely gone — and against the cost of a contested divorce, the real thing is almost always the cheaper option in the end (see why a prenup is cheaper than a divorce).
The false economy at the heart of the idea
The whole appeal of the “poor man’s prenup” is that it costs nothing, but that is exactly what makes it a false economy. It feels free precisely because it does so little: there is no document to draft, no disclosure to exchange and no advice to take — and it is those very steps that would have given real protection. Weighed against the potential loss if a court redistributes assets you assumed were safe, or against the legal fees of fighting over them in a contested divorce, the “saving” evaporates. A modest fixed fee for a proper online agreement is trivial next to the value of a home, a business or a pension it can help protect, and tiny compared with the cost of a drawn-out divorce (see are prenups worth it?). Paying nothing for protection that does not hold is rarely the bargain it appears to be.
Who is most exposed if they rely on it
Some people are especially poorly served by the name-only approach. Anyone bringing a business into a marriage, expecting a future inheritance, or entering a second marriage with assets they want to preserve for children from a first relationship, has a great deal riding on protection that actually works. For them, a bare arrangement of separate accounts is not just weak — it can give a dangerously false sense of security, so that they take no further steps precisely because they believe the problem is already solved (see protecting children’s inheritance). A properly made prenup replaces that false comfort with a genuine, evidenced plan — which is the difference between hoping an asset is safe and having taken real steps to keep it so.
Does a poor man’s prenup actually work?
A “poor man’s prenup” — protecting your assets simply by keeping everything in your own name, with no formal agreement — is a popular idea but not a reliable substitute for the real thing. On divorce a court looks at the whole financial picture and can share assets regardless of whose name they are in, especially to meet needs. Keeping finances separate helps avoid “mingling”, but on its own it does not stop redistribution. A proper online prenup now costs a modest fixed fee, so the real thing is within reach.
What the court actually does with assets kept in one name
The reason the "poor man's prenup" disappoints is written into the statute. Section 25 of the Matrimonial Causes Act 1973 tells the court to have regard to the property and other financial resources which each of the parties has, and the court's powers to transfer property and order lump sums apply to assets in either name. Whose name is on the deeds is evidence of ownership; it is not a fence around the asset.
What does carry weight is the distinction between matrimonial and non-matrimonial property, and here separate finances genuinely help. In Standish v Standish, decided in 2025, the court confirmed that the sharing principle applies to matrimonial property, the wealth built up during the marriage, and not to non-matrimonial property such as pre-marital assets, gifts and inheritances, unless the parties have over time been treating that property as shared between them. Keeping an inheritance in your own account, and not spending it on the family home, is precisely the sort of conduct that keeps it non-matrimonial. But the same judgment is clear that needs come first: where the matrimonial property is not enough to meet both partners' reasonable needs, the court can and will reach into non-matrimonial property to do so.
A written prenup adds the one thing separate accounts cannot: your partner's agreement. Under the test in Radmacher v Granatino an agreement freely entered into with a full appreciation of its implications is given effect unless it would be unfair to hold you to it, and the record of financial disclosure it contains proves what was yours at the outset. Separate finances are good evidence. A signed agreement is a settled intention, and the court treats the two very differently.
Frequently asked questions
Does keeping money separate protect it in divorce?
It helps avoid mingling, but does not stop a court sharing it to meet needs (see are prenups legally binding?).
Is a real prenup expensive?
No longer — an online agreement is a fixed, modest fee (see prenup costs).
If assets are only in my name, are they safe?
Not automatically — the court can share assets regardless of whose name is on them (see how assets are divided).
Is a DIY prenup the same as a poor man’s prenup?
Not quite — a DIY prenup is at least a written agreement, but it often skips the disclosure and advice that make one robust.
Should I still keep my finances separate if I have a prenup?
Yes — it is good practice that reinforces the agreement (see joint vs separate property).
What is the cheapest way to get real protection?
Draft the agreement online for a fixed fee, then take advice on it (see cheap prenups and their pitfalls).
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.