Not everyone comes into a marriage with assets to protect – some come in with significant debt. Whether it is yours or your partner’s, a prenup can bring welcome clarity about who is responsible for what. This guide explains how debt is treated on divorce, how a prenup helps, and the limits of what it can do.
Debt and divorce: the basics
A debt in one partner’s sole name generally remains that person’s responsibility – marriage does not automatically make you liable for your partner’s borrowing. But on divorce, debts and assets are weighed together as part of the overall settlement, so debt still affects the outcome. A large debt reduces the net pot available to divide, and how that reduction falls between the two of you is one of the things a court decides. Bringing significant debt into a marriage is one of the situations worth planning for – see who should consider a prenup.
Types of debt that commonly come up
- Student loans – often large, but repaid through the tax system and treated differently from ordinary debt.
- Credit cards and personal loans – usually the clearest case for ring-fencing pre-marital borrowing.
- Business borrowing – where a partner has taken on debt to fund a business.
- Mortgages and secured debt – tied to a specific property.
How a prenup helps
A prenup can record which debts each partner brought into the marriage and confirm they remain that partner’s responsibility – protecting the debt-free partner and setting clear expectations for both. Honest disclosure of debts is part of this: just as you disclose assets, each partner should set out what they owe (see what to include and pre-marriage debts and who is responsible). For a couple where one partner is debt-free and the other is not, this clarity can be reassuring on both sides.
What a prenup cannot change
A prenup governs things between the two of you; it does not change what a lender can pursue. If you take out a joint loan, both of you remain liable to the lender whatever your prenup says between yourselves. And a court keeps its discretion to reach a fair overall result, so a prenup cannot force an outcome that leaves one partner unable to meet their needs (see are prenups legally binding?). For how debts are actually divided on divorce, see how debt is split in a divorce.
A prompt for an honest conversation
One quiet benefit of raising a prenup when there is debt around is that it forces an honest conversation about money before the marriage – who owes what, how it will be repaid, and how you will manage finances together. That openness is valuable in itself, and often more useful than the document. It sits alongside broader income and wealth differences that couples benefit from discussing early.
Prenups and debt: protecting the debt-free partner
When one or both of you bring significant debt into a marriage, a prenup brings clarity: it records each partner’s debts at the date of marriage and confirms they remain that person’s responsibility, protecting the debt-free partner. It cannot stop a lender pursuing a joint loan, and the court keeps discretion over the overall settlement – but for couples marrying with student loans, credit cards or business borrowing, that clarity is genuinely valuable.
Protecting a debt-free partner marrying into debt
The situation cuts both ways. If you are the debt-free partner marrying someone with significant borrowing, a prenup gives you reassurance that their pre-marital debt stays theirs and will not quietly become a shared burden. Recording each partner’s debts clearly at the outset – and confirming who is responsible – protects you without being punitive, and it pairs naturally with an honest conversation about how the debt will be managed during the marriage (see pre-marriage debts).
Debt today, assets tomorrow
Debt at the start of a marriage is often temporary – student loans repaid, a business turning a corner, a career taking off. A prenup can look beyond the current position and set a fair framework for the wealth you expect to build once the debt is behind you, kept current with a review clause. That way the agreement is about your whole financial future together, not just a snapshot of a difficult moment (see should a prenup cover future assets?).
Sole debt, joint debt and the family home
The distinction that matters most is between debt in one name and debt in joint names. A loan or credit card in your sole name is legally yours: marrying someone does not make them liable to your lender, and a prenup can confirm that your pre-marital sole debts stay with you. A joint debt is different – both of you are liable to the lender for the whole amount, and no prenup can change that, because your agreement binds the two of you but not a third-party bank. Secured debt adds another layer: a mortgage follows the property it is secured on. A prenup can allocate responsibility between you, but it works alongside your obligations to lenders, not instead of them (see pre-marriage debts and who is responsible).
A worked example
Imagine one partner enters the marriage with £30,000 of student loans and £10,000 on credit cards, while the other is debt-free with £40,000 saved. Without any agreement, a later divorce would weigh those debts and assets together as part of the overall settlement, and the debt-free partner might feel their savings were being used to clear borrowing that predated the marriage. A prenup can record each partner’s debts at the date of marriage and confirm that the borrowing stays with the person who incurred it – noting that student loans, repaid through the tax system, are usually treated differently from ordinary debt. Both partners then start the marriage clear about who owes what (see how debt is split in a divorce).
Disclosing debts, not just assets
It is easy to think of disclosure as listing what you own, but debts matter just as much. A prenup built on incomplete information – where one partner hid a large debt – is exactly the kind a court may set aside, so honesty protects the agreement as well as the relationship. Setting out every debt, its size and its terms gives a clear baseline (see full and frank disclosure). And because early debt is often temporary, a review clause lets the agreement look beyond a difficult moment to the wealth you expect to build once the borrowing is behind you (see should a prenup cover future assets?).
Managing debt together during the marriage
A prenup records the starting position, but how you handle money during the marriage matters just as much. If a debt-free partner voluntarily helps clear the other’s borrowing, or the couple take on joint debt to fund a shared life, the lines the prenup drew at the outset can shift – and joint debt, remember, binds both of you to the lender whatever the prenup says between yourselves. Agreeing some ground rules early – keeping certain debts separate, being cautious about jointly guaranteeing each other’s borrowing, and revisiting the position as debts are repaid – keeps the agreement meaningful. A review clause lets you formally update it as the picture changes (see pre-marriage debts).
It is worth being realistic about the limits, too. A prenup governs matters between the two of you and cannot bind a lender, nor can it force an outcome that leaves one partner unable to meet their needs, because the court keeps its discretion under the Matrimonial Causes Act 1973 (see are prenups legally binding?). What it does very well is bring honesty and clarity: each of you knows what the other brought in, who is responsible for what, and how you intend to build from there – which is a healthy foundation whatever the size of the debt (see how debt is split in a divorce).
Prenups and debt: FAQs
Will I inherit my partner's debts when we marry?
Not debts in their sole name, but they affect the overall settlement (see how debt is split in a divorce).
Can a prenup ring-fence pre-marriage debt?
Yes – it can confirm each partner’s pre-marital debts remain theirs (see pre-marriage debts and who is responsible).
What about a joint loan we take out together?
Both of you remain liable to the lender regardless of the prenup, which only governs things between you (see what to include).
Do I have to disclose my debts in a prenup?
Yes – honest disclosure of debts as well as assets is essential (see full and frank disclosure).
How are student loans treated?
They are usually treated differently from ordinary debt, but should still be disclosed (see pre-marriage debts).
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.