The NAN code (National Affiliation Number) is the identifier assigned by the CRCESU to any provider who cashes CESU pre-financed vouchers. Its structure, consisting of 1 to 7 digits followed by an asterisk and a key number, is used exclusively for the reimbursement process. Confusing this number with the declarative CESU system remains the most common mistake, and it regularly blocks initial cashing.
NAN Code and Declarative CESU: A Technical Distinction to Master
The declarative CESU concerns the employer-employee relationship declared via Urssaf. The NAN code, on the other hand, only comes into play in the cash flow of pre-financed CESUs. These are two distinct mechanisms, managed by two different organizations: Urssaf on one side, CRCESU on the other.
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We observe that most articles mix these two areas. An employee paid through the declarative CESU does not need a NAN code as long as they do not receive pre-financed vouchers. However, as soon as a pre-financed voucher is involved, affiliation with CRCESU becomes mandatory to obtain reimbursement, whether the provider is an individual, a company, or an association.
This confusion has concrete consequences: providers attempt to submit pre-financed vouchers via the Urssaf space, which does not manage this flow. Others create multiple CRCESU accounts thinking that a NAN code is linked to each employer, whereas only one NAN code is assigned per provider, regardless of the number of employers. To find explanations about the CESU NAN code and its specifics, this distinction between affiliation and declaration serves as the starting point.
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Affiliation with CRCESU: Actual Scope of NAN Code Beneficiaries
The NAN code is not only aimed at home employees hired by individuals. Its scope covers all providers who accept the pre-financed CESU as a means of payment.
This includes structures rarely mentioned in public guides:
- Mandating associations or personal service providers, who cash the vouchers on behalf of their providers
- Approved home service companies (cleaning, childcare, tutoring), including self-employed individuals
- Collective reception structures such as nurseries, leisure centers, or after-school programs, which accept pre-financed CESUs in certain areas
The NAN code thus functions as a acceptance and cashing identifier, not as a social declaration tool. An affiliated service provider uses its NAN code to submit its remittance slips, just like an employee directly hired by an individual.
Case of Territorial Collective Structures
Several local authorities accept pre-financed CESUs for the payment of after-school or leisure services. In this context, the structure (town hall, managing association) holds its own NAN code. This use case remains poorly documented but represents a growing share of affiliations with CRCESU.
Cashing Process with the NAN Code: Remittance Slips and Online Submission
Affiliation with CRCESU generates the sending of a welcome letter containing the NAN code and a password for accessing the personal space. This letter also includes personalized remittance slips pre-printed with the NAN code.
Two remittance processes coexist. The first, historical, involves sending paper vouchers along with the slip to CRCESU by mail. The second, which we systematically recommend, is through online submission via the CRCESU personal space.
Online Submission: Points of Caution
Online entry requires entering the amount of each voucher, the issuer, and the voucher number. The NAN code serves as an identification key at each step. In case of entry error, reimbursement is blocked without automatic notification, necessitating a manual check of each batch before validation.
The reimbursement timeline varies depending on the submission method. Online submission generally results in faster processing than postal submission, but neither process guarantees a fixed timeline. We recommend keeping a digital copy of each slip to facilitate any potential claims.
Frequent Issues with the NAN Code and Resolution
Three situations account for the majority of blockages encountered by affiliates.
The loss of the NAN code is the most common case. CRCESU does not automatically resend this information. Recovery can be done through the personal space (if the password is still active) or by a written request to the CRCESU support service, with proof of identity.
Changing legal status (for example, transitioning from self-employed to a company) presents a different issue. The NAN code being linked to the affiliated legal entity, a change in legal form requires a new affiliation and thus a new NAN code. Vouchers received under the old status must be submitted before closing the initial account.
The third case concerns expired vouchers or unrecognized issuers. Some pre-financed CESUs have an expiration date. If an expired voucher is included in a slip, the entire batch may be delayed. We recommend sorting vouchers by issuer and date before each submission.
Modification of Bank Details
Reimbursement is transferred to the bank account associated with the NAN code. Any changes to bank account details must be made before submitting the vouchers. A submission validated with an old bank account will result in a bank rejection, and reprocessing takes several weeks.
The NAN code remains a simple tool in its logic, but its operational management requires rigor. Checking one’s affiliation status, keeping contact details up to date, and clearly distinguishing the pre-financed circuit from the declarative circuit are the three reflexes that prevent nearly all reimbursement incidents with CRCESU.