A poorly declared change of address to the CAF triggers a retroactive recalculation of benefits, with a request for reimbursement of overpayments. The declaration is not limited to changing a line in a form: it triggers a complete reassessment of rights, from the amount of APL to the departmental attachment of your file.
Group declaration via the “Je déménage” system on Service-Public.fr
Most guides focus on the caf.fr site or the mobile app. We recommend first examining the online service “Je déménage” from Service-Public.fr, which allows you to report a move to several organizations in a single step: CAF, taxes, CPAM, La Poste.
This group declaration system prevents forgetfulness. You enter your new address only once, and the service transmits the information to the relevant administrations. The CAF then receives the notification, but it does not automatically recalculate your rights.
The technical point to remember: the “Je déménage” service transmits the address, not the information related to the new housing (amount of rent, type of lease, name of the landlord). These elements must be completed directly in your personal CAF space. To delve deeper into the complete procedure, we have written a guide on changing your CAF address that details each step of the process.
In practice, the group declaration never exempts you from a second login on caf.fr to finalize the update of your housing file.
CAF file transfer when changing departments
A move within the same department simply updates your address. A change of department triggers a different mechanism: the full transfer of your file to the new CAF of attachment.
This transfer is not instantaneous. Processing can take several weeks, during which your payments may be suspended. We observe that this latency period is the main source of difficulties for beneficiaries.
What happens concretely during the transfer
Your old CAF closes your file and sends it to the CAF of the new department. The new CAF opens a file, verifies the documents, and recalculates your rights according to the parameters of the new housing. During this transition:
- APL payments are interrupted until the new fund takes over, as there is no double payment between two CAFs
- The beneficiary number remains the same, but the contact person changes: your letters, messages, and file follow-ups switch to the new fund
- Family benefits (family allowances, family supplement) are also recalculated, as some scales incorporate parameters related to housing
Declaring the move as soon as the lease is signed, even before the actual move-in, shortens this latency period.
Shared housing, student residences, and intermediate housing: cases that complicate the declaration
Transitioning from a traditional housing situation to shared housing changes the nature of the lease declared to the CAF. In shared housing, each roommate declares their share of the rent individually, which alters the APL calculation compared to a single lease.
Private student residences and social residences (youth worker hostels, integration residences) add a layer of complexity. These structures sometimes have a convention signed directly with the CAF. In this case, the expected proof of housing is not a standard lease but a residency certificate issued by the structure.
Documents to prepare according to the type of housing
The online form from the CAF systematically asks for the type of housing, the amount of rent excluding charges, and the landlord’s contact details. The additional documents vary:
- Private housing: signed lease, landlord’s certificate, or rent receipt
- Shared housing: individual lease or shared lease clause, indicating the share of rent
- Conventional student or social residence: residency certificate mentioning the CAF convention number of the establishment
- Free accommodation: sworn statement from the host, sometimes accompanied by proof of residence from the latter
Omitting a document delays processing. The CAF sends a request for additional documents via the messaging system of the personal space, and the file remains pending until receipt.
APL and move-in dates: the trap of an incomplete month
APL is calculated by complete calendar month and paid in arrears. This rule has direct consequences on the declaration of the change of address.
If you leave a housing unit on the 15th of the month and enter the new one on the 16th, the CAF does not pay APL for two housing units in the same month. The exact date of entry into the new housing, as declared on caf.fr, determines the first month of payment for the new APL.
We recommend providing the actual date of key handover or signing of the entry inventory. Any inconsistency between the declared date and the one on the lease can trigger a check and delay payment.
Post-declaration follow-up in the personal space
After the declaration, the “My payments” section of the CAF personal space remains the only reliable indicator of the acknowledgment of the change. If no recalculation appears within a few weeks, a follow-up via the internal messaging system is preferable to a phone call, as it leaves a written record in the file.
Declaring a change of address to the CAF involves much more than a simple postal update. Rent, type of lease, department, and entry date are four variables that directly modify the amount of benefits. Anticipating the declaration as soon as the lease is signed and preparing the appropriate documents for the type of housing remains the safest way to avoid a payment interruption.