TLDR: The quotient familial is a French mechanism that adjusts the calculation of income tax to your personal situation and family responsibilities. It divides your net taxable income by a number of shares determined according to your family situation and dependents, in accordance with Articles 194 and 195 of the Code général des impôts (CGI).
Definition and basic principle
The quotient familial is a system that adjusts taxation based on your family situation. It applies to all taxpayers subject to income tax in France, regardless of nationality. The calculation is based on dividing your net taxable income by a number of shares, which is set according to your situation and family responsibilities.
Basic shares
Single, divorced, or widowed taxpayers with no dependents are entitled to 1 share of the quotient familial. Taxpayers who are married or in a PACS (subject to joint taxation) receive 2 shares. These rules apply regardless of nationality or place of residence, as long as you are subject to tax in France.
Additional shares for dependents
Dependents, as defined by Article 196 of the CGI, entitle you to an increase in the quotient familial. For the first two children, the increase is 0.5 share each. From the third child onwards, the increase is 1 full share per child.
The following are considered dependents:
- children under 18 years of age;
- disabled children, regardless of age;
- adult children attached to your tax household if they are under 21, under 25 if they are still in education, or any age if they are performing military service. To qualify for this increase, you must have assumed educational and financial responsibility for the child.
Special cases: shared custody
In cases of shared custody (affidamento condiviso), each parent who lives alone and assumes responsibility for the children during the periods they reside in their home may receive an increase of 0.25 share for each of the first two children. However, this increase cannot be combined for both parents if the children are considered equally dependent on both.
The calculation of increases is done prioritising children who are exclusively or primarily dependent, followed by those with shared dependency.
Conditions for receiving additional shares
To benefit from the increases in the quotient familial, you must:
- live alone (this condition is not met in cases of cohabitation, marriage, or PACS during the year);
- have assumed educational and financial responsibility for the child.
Limits and caps
The tax reduction resulting from the application of the quotient familial is capped at €1,791 per half-share (or half this amount per quarter-share) for single, divorced, widowed taxpayers, or those subject to separate taxation. For married taxpayers subject to joint taxation, the cap applies from two shares onwards.
In cases of separate taxation (e.g., year of marriage, divorce, separation, or dissolution of PACS), each taxpayer may benefit from the additional half-share if they live alone on 31 December of the tax year.