All new businesses must declare their operation to the tax authorities (Direction Nationale des Impots et des Domaines) within twenty days of starting the business activity. This is required for the update of records of the Direction Nationale des Impots et des Domaines (DNID) to ensure taxpayers' compliance. The required documentation for the tax registration is:
Source: https://www.letsdeel.com/blog/register-sole-proprietorship-in-benin