Turnover indices are calculated based on tax data, i.e. the CA3 declaration, the form which businesses must fill in each month or each quarter for the payment of VAT;
They include the full turnover of declaring businesses, all activities included, classified according to the business's principal activity.
The consumer price index (CPI), which serve to calculate deflators allowing to pass of an index in value to an index in volume, are calculated by INSEE (DSDS) based on the data collected by a  survey.

Monthly

"Whole France" (except French Guyana and Mayotte which are not liable to VAT)

Legal unit