The national aggregates (GDP, gross value added by sector, demographic data, and households account) used to calculate the regional accounts are provided by the National Accounts Department (DCN) of INSEE.

The regional accounts are then based on numerous other statistics, including business statistics (ESANE), employment statistics (Flores, Heracles), and numerous other statistics from the Official Statistical System (SSP), as well as tax and administrative data. Regional accounts rarely use survey data, which often do not allow for reliable regionalization.

Annual

All the data used to estimate regional accounts are produced by other INSEE departments or within the Official Statistical System (SSP).

The source data used to estimate regional accounts are only used once validated by the responsible departments. Checks are integrated into the production chain (particularly for business statistics) to ensure the plausibility of changes in the used variables.

The regional accounts estimation chains incorporate accounting equality, aggregation (on NUTS) and consistency checks with national aggregates throughout the production process.

Finally, during the current campaign, the estimates for the last four accounts are validated by competent DCN representatives before dissemination.

Regional accounts are estimatedtop-down. The current accounting campaign schedule allows all estimated aggregates to be aligned with the national aggregates. For each estimated operation, the amounts from the overseas territories' accounts are considered exogenous (are subtracted from the totals). Finally, each estimated transaction is allocated between metropolitan regions by following the distribution of a known variable that is highly correlated with it.

VA and GDP are regionalized according to localized payrolls, obtained from company payrolls (employment statistics), allocated across establishments in proportion to their VA in the company's VA (via business statistics).

No adjustment of national accounts data for total economy and institutional sectors is necessary at the end of the process since consistency is ensured in the production process itself.