The implementation of the NFS-e endeavours to accomplish a dual purpose: to facilitate the tax process for taxpayers but also to be a database (ADN - National Data Environment) to be used by the tax authorities in the event of inspections. The national standard system for the NFS-e (Service e-Invoice) in Brazil is currently at testing stage, with only seven cities selected to start the pilot project. The municipalities can adhere to the use of the NFS-e system - both those that already have an electronic system and those that do not. Municipalities are therefore not required to use the system, however, the municipalities that do not will also not have access to the national database. As of January 2023, individual microentrepreneurs (known as MEI in Brazil) will be required to issue their service invoices from the NFS-e system.