For which procedures is this certificate mandatory?

This is the most critical certificate for any commercial company (Limited Liability Companies, Public Limited Companies).

It is strictly mandatory to interact with Public Administrations on behalf of the company:

• Filing tax models (VAT, Income Tax, Corporate Tax) with the Tax Agency.
• Registering or deregistering workers with Social Security.
• Receiving mandatory electronic notifications (DEHú).
• Signing contracts or participating in public tenders.