The CAF does not limit itself to marital status to determine if two people form a couple. Its definition is based on the notion of marital life, which encompasses cohabitation, free union, and PACS. Two people, of the same sex or different sexes, living together as if they were married are considered a couple by the CAF, with direct consequences on the calculation of benefits.
Digital traces and algorithms: the detection tools of the CAF
Competitors mainly detail physical checks and supporting documents. A less discussed aspect concerns the technical means available to the CAF to identify inconsistencies even before sending an inspector.
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An internal guide from the CNAF, updated in 2023 and mentioned in several ministerial responses, confirms that the CAF can exploit certain technical data related to the beneficiary space. Among them: connection IP addresses, the frequency of access from the same network, or the reuse of the same device to manage two distinct files.
Specifically, if two beneficiaries declared as living separately regularly connect from the same IP address or terminal, the system can generate an alert. This type of automatic cross-checking is integrated into a preventive system, rather than just a reactive one. The performance reports attached to the finance bill projects have mentioned since 2023 a quantified objective of increasing checks targeting household composition, with a rise in the number of on-site and document checks.
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To fully understand the control of cohabitation at the CAF, it is essential to keep in mind that these digital verifications often precede physical checks and determine their initiation.
Criteria for couple life retained by the CAF during a check
The CAF does not rely on a single indicator to reclassify a situation. It relies on a set of converging elements, examined during a document check or a home visit.
Material indicators sought by the inspector
The inspector checks several concrete aspects of daily life:
- The common postal address: two people residing at the same address constitute a first signal, even if this alone is not enough to characterize a couple
- The sharing of current expenses: a joint bank account, energy bills or subscriptions in both names, or rent paid jointly
- The arrangement of the housing: the presence of a single used bedroom, mixed personal belongings, or the absence of distinct private spaces
- Tax and administrative declarations: any inconsistency between the CAF declaration and the tax declaration constitutes a strong signal, especially if one of the two appears as a dependent of the other
Difference between cohabitation and shared housing for the CAF
The boundary between shared housing and cohabitation is based on the nature of the relationship, not merely on the shared living space. Two roommates each have their lease (or appear on a common lease as roommates), manage their finances separately, and have no pooling of their resources on a daily basis.
The CAF considers that there is couple life when the community of life goes beyond the simple sharing of a roof. A common budget, shared shopping, presenting as a couple to third parties, or having children together are all elements that shift the qualification.
Consequences of unreported cohabitation on CAF benefits
When the CAF reclassifies a situation from single to couple, it recalculates all benefits based on the combined resources of both partners. This recalculation can lead to three types of consequences.
The first is the reduction of housing assistance (APL, ALS). The amount of assistance is recalculated by including the partner’s income, which mechanically reduces the benefit, sometimes to the point of elimination.
The second concerns the removal of benefits reserved for single parents. The family support allowance (ASF) and the isolation supplement for the RSA disappear if the person is considered to be in a couple.
The third is the reimbursement of overpayments. The CAF can demand the reimbursement of amounts paid in error, sometimes over several years. In cases of proven fraud (deliberate concealment), administrative penalties are added to the reimbursement. The procedure can lead to the filing of a complaint.
Declaration obligations and deadlines to respect
Any change in family situation must be reported to the CAF as soon as possible. Entering into a couple, whether it involves moving in together, a PACS, or marriage, falls under this obligation.
The declaration is made directly from the “My Account” space on caf.fr, in the “Modify my situation” section. The telephone service (3230, free call) also allows for reporting a change. The CAF then adjusts the rights starting from the month following the declared change.
Failing to declare cohabitation, even by simple oversight, exposes one to the same reimbursement risk as voluntary fraud. The difference lies in the penalties: good faith reduces sanctions but not the overpayment. The CAF distinguishes between error and concealment, but in both cases, the unduly received amounts remain owed.
The strengthening of digital controls makes the detection of inconsistencies faster than before. An undeclared couple sharing the same internet connection to manage two distinct CAF files now leaves an exploitable trace, well before an inspector knocks on the door.