Tax Authority (AT) setup guides

Self-billing (autofaturação) needs two settings in the Portal das Finanças, each made by a different party. Choose the guide that applies to you.

I am the supplier

Register the prior agreement

Authorises the buyer company to issue invoices in your name. Two fields, about 3 minutes, only once. You do not need to create sub-users or share passwords.

I am the buyer

Create the sub-user (WFA + WSE)

Creates the sub-user (sub-utilizador) with the WFA and WSE profiles, which ARQTA uses to report series and invoices to AT. Only once, per company.

Who does what?

Buyer (adquirente, the company that issues): creates one sub-user with WFA + WSE and enters the credentials in ARQTA.
Supplier (fornecedor, who provides the service): registers the prior agreement authorising the buyer’s NIF. Without this step, AT refuses the invoices.

ARQTA detects automatically when an agreement becomes active, registers the series with AT and starts issuing the queued invoices. Nobody needs to be told.