Key points to know for your income tax declaration

The family quotient system

A key element of how income tax is calculated in France is the quotient familial (family quotient).

This system allocates a number of ‘parts’ to your household. The more people in your household – such as a spouse, civil partner or dependants – the more parts you have, which can reduce your overall tax bill.

The aim is to reflect the fact that a given income supports a household differently depending on its size.

You do not need to calculate this yourself – the French tax authorities apply it automatically.

How it works

France applies progressive tax bands to income. However, for households (rather than single individuals), the calculation is adjusted using the family quotient:

1. Your household’s net taxable income is divided by the number of parts

2. Tax bands are applied to this reduced figure

3. The resulting tax is then multiplied by the number of parts

This means larger households benefit from lower tax rates on a greater share of their income.

How ‘parts’ are allocated

• A single person: 1 part

• A couple (married or in a recognised civil partnership/Pacs): 2 parts

• First and second dependent children: ½ part each

• Third and subsequent children: 1 part each

Dependants can include:

• children under 18 (or older if still financially dependent and in education)

• certain adults living with you who are dependent, including those with a recognised disability

Additional parts may be granted in specific situations, including disability, single parenthood or widowhood.

There is also a cap on the tax advantage that the family quotient can provide, which mainly affects higher-income households.

Social charges (prélèvements sociaux)

In addition to income tax, France levies social charges on most types of taxable income and capital gains. These help fund the country’s social security and welfare system.

They are separate from income tax and generally do not benefit from the same allowances or reductions.

What are they applied to?

Social charges may apply to:

• employment income and pensions

• investment income (interest, dividends, capital gains)

• rental income

Some savings products, such as regulated accounts (eg. Livret A), are exempt.

Main rates

The principal social charges are:

• Contribution sociale généralisée (CSG)

• Contribution au remboursement de la dette sociale (CRDS)

• Prélèvement de solidarité

On investment income, these combine to a standard rate of 17.2%.

Pensions are usually subject to lower rates, depending on income level, and some lower-income pensioners may be partially or fully exempt.

Key points to note

• Social charges are charged in addition to income tax

• They are shown separately on your annual tax statement (avis d’imposition)

• Some elements may be partially deductible from taxable income

Currency conversions

If you receive income in a foreign currency, it must be converted into euros for your French tax return.

Officially, you should use the exchange rate on the date the income was received. In practice, for regular income streams, the use of an average annual exchange rate is generally accepted.

Declaring foreign income

French tax residents must declare worldwide income, even if it is not ultimately taxed in France.

In some cases, foreign income is:

• taxed in France, or

• taken into account only, meaning it can affect the tax rate applied to other income without being taxed itself

This prevents individuals from benefiting from multiple countries’ tax-free allowances.

France’s tax treaties – including with the UK – ensure that double taxation is avoided, typically through tax credits or rules allocating taxing rights between countries.

Declaring your income

Most people are required to declare income online via the official tax website.

Paper declarations are generally limited to:

• first-time declarations

• those unable to use online services

Online declaration offers:

• later deadlines

• the ability to amend submissions

• easier access to previous returns and tax documents

Getting help

Support is available if needed:

• Local tax offices may provide in-person assistance

• France Services centres offer free help with administrative procedures

• Some areas provide access to public computers or guided support

Online declarations usually open between April and June, depending on your location.