Money and couples

Why money arguments keep coming back

Rarely because there is not enough. Almost always because neither person has ever said out loud what money means to them: security to be stored up, a tool to be spent, a moral debt never to be incurred, a freedom not to be lost. Two different definitions produce the same argument every month, about a different object each time.

Research corrects a common assumption. In a study in which one hundred married couples kept a diary of their arguments at home (748 conflicts recorded), money was not the most frequent subject; but money conflicts were more pervasive, more problematic and more recurrent than the others, and more often stayed unresolved despite more attempts to settle them (Papp et al., 2009). In a large American survey that followed 4,574 couples over time, financial disagreements were, of all types of disagreement, the ones that predicted divorce most; once those disagreements were taken into account, the household's level of resources no longer played a part (Dew et al., 2012).

The useful conversation is therefore not about the next purchase but about three questions: what does each of us earn, what does each of us own, and what counts as a normal expense. It takes an hour, once, and it saves ten years of friction.

Splitting when incomes differ

There are three systems. None suits every couple, but the third is often the most balanced when incomes differ.

The arrangement that works best in practice is three accounts: a joint account fed in proportion for rent, food, energy and children; and one personal account each, whose use nobody has to justify. That is the opposite of mistrust: it is what makes it possible not to comment on the other person's spending.

Research also argues for some pooling. In the first experiment to assign at random how couples manage their money, published in 2023, engaged couples and newlyweds invited to put their money into a joint account kept a good quality of relationship through the first two years of marriage, whereas those who kept separate accounts, or who were left to choose, went through the usual decline of that period. The authors explain this by three mechanisms: the feeling of managing money better, better aligned financial goals, and the habit of meeting the other person's needs without keeping count (Olson et al., 2023). The study does not test the three-account set-up and only covers the early years of marriage: it merely suggests that pooling money protects the relationship better, at that stage, than keeping everything separate.

Buying a home together

This is where a mistake costs the most, and where the rule is counter-intuitive: what counts is not who pays, it is what the deed says. If one funds 60% and the deed says 50-50, each owns half; the surplus is not recovered automatically: depending on the country and the matrimonial regime, it has to be claimed, where that is possible, as a debt owed by the other. In France, for example, a spouse married under separation of property who paid their partner's share can bring a claim against them for it (Cour de cassation, 2021). Four precautions hold everywhere.

• Have the real shares written into the deed, to the penny, including each person's initial contribution.
• Write down the repayment too: who pays what share of the instalment, and what that changes about ownership.
• Plan the exit before the entry: what happens if one wants to sell and the other does not, and at what price one can buy the other out.
• Check the mortgage insurance: the share insured on each life decides what is left to pay if one dies.

In France, the three statuses are not equal for a purchase by two people. If the home is bought in joint ownership (indivision), the partner who repaid the loan beyond their own share in principle holds a claim against the joint ownership when it is divided up, provided they can prove it (French Civil Code, art. 815 et seq.). For a couple married under separation of property or in a PACS, case law instead treats repayment of the family home's loan as a contribution to the costs of the marriage, or as the material aid owed under the PACS: unless the deed says otherwise, it gives rise to no claim. Hence the value of having the notary specify, from the purchase, the shares, the contributions and what happens to repayments (French Civil Code, art. 214; French Civil Code, art. 515-4).

The applicable regime changes everything and depends on country and status: see matrimonial property and living together unmarried.

One partner's debts

Many people discover the rule at the worst moment. Depending on country and regime, debts taken on by one can bind both — particularly those for the upkeep of the household and the children's education. Conversely, a large personal loan, a guarantee or a business debt in principle bind only the signatory, unless the other consented. Two reflexes: never stand guarantor without measuring the worst case, and check what you are signing at the same time as the other person.

In France, the rule is written down. Each spouse may bind the household alone for everyday needs and the children's education, and the other is jointly liable; that joint liability falls away for manifestly excessive spending and, unless the amounts are modest and necessary for everyday life, for instalment purchases and loans taken out without both spouses' agreement (French Civil Code, art. 220). PACS partners are bound in the same way for everyday debts (French Civil Code, art. 515-4). An unmarried couple with no PACS has no such statutory joint liability, unless both signed the contract or the lease.

In France: taxes, joint accounts and joint tax liability

Tax and banking rules are the same, or nearly so, for married and PACS couples, and differ for those living together without either. The details below apply to France only.

One shared tax, an individualised withholding

Spouses and PACS partners are taxed together on income, with a single return (General Tax Code, art. 6); unmarried partners each file their own. Since 1 September 2025, the withholding tax rate for married or PACS couples is individualised by default: each person is assigned a rate calculated on their own income, instead of a single rate for the household (Finance Act for 2024, art. 19). The tax due for the year does not change, only the split of the withholding between the two: the partner with the lower income sees their monthly withholding fall, the other sees it rise. The couple can still choose a joint rate.

For the real estate wealth tax, the household is shared by married couples, PACS partners and recognised cohabiting partners, with a single threshold (General Tax Code, art. 964).

The joint account: each is liable for everything

A joint account has two holders, whether the couple is married, PACS or neither. Each can withdraw the whole balance, and each is liable to the bank for the whole of any overdraft, whatever each contributed to the account. To close a joint account or leave it on separation, the step is taken by letter to the bank; it is prudent to do so as early as possible, before the other draws on the account (Service-Public, sheet F2413). Each spouse also keeps the right to open an account in their own name alone and to use it freely (French Civil Code, art. 221): this is what makes the three-account arrangement possible.

One partner's taxes, both partners' debts

Spouses and PACS partners are jointly liable for payment of the household's income tax (General Tax Code, art. 1691 bis). After a divorce or break-up, the former partner from whom the tax authority claims the tax can in some cases ask to be released from this joint liability. The law of 31 May 2024 on ensuring fairness over property within the family widened these cases, notably where the reassessment stems from the other's fraud or concealment from which the applicant did not benefit (law of 31 May 2024). The request is made to the tax authority, with supporting documents: prepare it with an adviser, as each situation depends on income and assets.

What unmarried couples do not have

In most countries, living together for a long time creates no rights by duration alone. Without marriage or a registered partnership, the survivor does not inherit as of right, the person who stopped working is owed nothing for having stopped, and a home in one name stays in that name. This is not a fate: a will, an agreement, buying in joint ownership with written shares, life insurance, a named beneficiary. But none of it happens automatically.

When money becomes a means of control

Managing money together assumes that each person keeps real access to what concerns them. When one person alone controls all the resources, denies the other access to money, or forbids them to work or study, this is no longer a way of organising a budget: UN Women classes these behaviours as economic violence (UN Women). The Council of Europe's Istanbul Convention, signed in 2011, counts economic violence among domestic violence, including between former spouses or partners (Council of Europe, 2011). In England and Wales, the Domestic Abuse Act of 2021 defines economic abuse as any behaviour that has a substantial adverse effect on the other person's ability to acquire, use or maintain money or other property, or to obtain goods or services (Domestic Abuse Act 2021).

The warning sign is therefore not a disagreement about a purchase, but a dependence kept up by the other person. The signs of control and the remedies are set out in domestic violence.

And if you separate

The cost of a separation depends far less on the procedure than on the number of points left unsettled in advance. See estimating the cost and time of a divorce, the procedure and inheritance and gifts.

What about you?

How do you manage money as a couple?

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