Can I use a TDPB address as my official fiscal or tax address?
No. A fiscal address (morada fiscal in Portugal, domicilio fiscal in Spain, with similar terms in many other countries) is the address tax authorities use for legally binding notifications. In many countries, especially for non-residents, registering one involves specific legal requirements, and often a regulated fiscal representative who takes on legal responsibility.
A TDPB address is a correspondence address, not a fiscal one. For your fiscal address, a local accountant or fiscal representative is the right solution. Your TDPB address then handles everything else: banks, insurers, invoices, subscriptions, and general correspondence.