Living alone in France does concentrate expenses into a single budget, but the statistics available here provide no reliable amount showing that a single person pays exactly 200, 300 or 500 euros more per month than someone living as a couple. The clearest benchmark is that people living alone may spend up to 46% of their budget on fixed costs, while pre-committed spending represented 30.4% of the disposable income of all households in 2024, according to INSEE.

In other words, living alone in France means bearing more of the expenses that cannot be split between two incomes. But claiming a precise extra cost item by item would be misleading without comparable data on rent, energy, insurance, food and taxes for single people and couples. The right approach is therefore to distinguish what is actually known from what must be calculated case by case.

How much does living alone really cost compared with living as a couple?

The first figure to keep in mind concerns pre-committed spending. According to INSEE, it absorbed 30.4% of household disposable income in 2024. These are expenses tied to commitments that are difficult to change quickly: housing, subscriptions and other recurring contracts typically fall into this category.

Another estimate puts the fixed costs of a French household at 1,133 euros per month, or about 35% of net income. For people living alone, the same source says they can account for up to 46% of the budget. This comparison cannot be used to calculate a “single-person tax” in euros: the first figure concerns an average household and the second a share of a budget. It nevertheless shows why solo living can be more financially strained.

The real disadvantage of living alone is not that one person necessarily consumes half as much as a couple; it is that many expenses remain necessary while only one budget has to cover them.

This is particularly important when looking at housing. A person living alone still needs a kitchen, a bathroom, access to energy and contracts connected with the home. But no available figure properly measures how much more a single person pays per person than a couple for each of these items. Giving a precise amount would therefore mean inventing an average that does not exist.

Can the extra cost be calculated item by item?

For rent, there is no direct numerical comparison here between a person living alone and a couple. It is intuitive that rent shared across two budgets does not create the same individual burden as rent paid alone, but the difference depends on the home chosen and cannot honestly be turned into a national average.

The same problem applies to energy and insurance. Some expenses vary with usage or the characteristics of the home, while others are contractual. The available data show the overall weight of fixed costs, not a breakdown that would allow a reliable monthly premium to be assigned to solo living.

For food, no comparative amount for single people and couples is provided. It is therefore impossible to state a percentage saving from shopping for two, even though shopping habits are clearly an item worth examining in a personal budget.

Finally, for taxes, the only quantified mechanism available concerns the family-dependant allowance on residence tax: it is 10% for each of the first two dependants and then 15% for each additional dependant, calculated on the average rental value. This scheme concerns dependants; it is not a general advantage granted to couples and therefore cannot be used to quantify a tax penalty specific to being single.

Does the extra cost vary by city or region?

It would be tempting to rank Paris, major metropolitan areas and cheaper cities. However, none of the data available here compare the extra cost of living alone by city or region. It is therefore not possible to seriously claim that a person living alone pays one premium in Paris and another in Bordeaux, Lille or Marseille.

This gap matters: simply comparing rent levels between cities would not answer the question. To measure the financial penalty of solo living, each area would need comparable budgets for one person living alone and two people sharing a home. Without that common basis, the result would measure the cost of the city rather than the extra cost of living alone.

Yet solo living is far from marginal. According to the latest INSEE census figures cited by The Conversation, 39% of primary residences are occupied by one person. Between 2016 and 2022, the number of homes occupied by one person rose by nearly 14%, compared with 5% for homes occupied by two people. The budget issue therefore concerns a substantial share of French homes.

How can the financial burden of living alone be reduced in practice?

The available figures cannot promise a precise saving from house-sharing, a particular benefit or tax optimisation. Artificial numerical recipes should therefore be avoided. However, the structure of the problem itself suggests a simple method: start with pre-committed expenses, because they weigh heavily and are difficult to change in the short term.

• Identify fixed contracts and their share of monthly income, rather than focusing only on small everyday expenses.
• Examine housing costs first, because this is a commitment that cannot simply be reduced by consuming less.
• Assess the actual sharing of certain expenses when considering a flatshare or another form of shared housing, without assuming a savings percentage in advance.
• Check the schemes that apply to your personal situation rather than assuming there is a single benefit or tax regime intended for people living alone.

In my view, this is where the idea of a “single-person penalty” becomes genuinely useful: not as a spectacular national figure, but as a tool for reading a budget. Two people can pool some expenses; a person living alone must first identify those they bear in full and measure their weight against their own income.

Frequently asked questions

What is the average monthly extra cost of living alone compared with living as a couple?

No reliable average monthly amount is available here to directly compare a person living alone with someone living as a couple. According to an estimate published by Billpayment, fixed costs can represent up to 46% of the budget of people living alone, while INSEE puts pre-committed spending at 30.4% of disposable income for all households in 2024.

Can the extra cost of rent, energy and groceries be quantified?

No, not with the available data: they do not provide an item-by-item comparison between single people and couples. A precise figure for rent, energy, insurance or food would therefore create an impression of precision that is not supported by the evidence.

Does the extra cost of living alone vary by city in France?

It is impossible to give a reliable ratio by city or region here because no territorial comparison between solo and couple budgets is available. Comparing city rents alone would not be enough: it would mainly measure geographical price differences.

What can reduce the financial penalty of being single?

The priority is to identify fixed expenses borne alone and examine which can genuinely be reduced or shared. No reliable average saving can be attached here to house-sharing, benefits or taxation; the only quantified allowance available concerns family dependants for residence tax and depends on having dependants, not simply on being part of a couple.