Finanças · Portuguese Tax Authority
Proof of starting an activity (Comprovativo de Início de Atividade)
Find the proof of tax registration for a new activity and understand what its start date, activity codes and tax status can confirm.
What it is used for
Check when the activity was declared to start and which CAE or CIRS codes were entered.
Provide proof of tax registration when requested, or review the details with an accountant.
Fictional practical example
Sofia starts working as a freelance translator. A company asks for proof of her tax registration; she provides the start-of-activity document without presenting it as proof of future income.
More about this document
What it is
This is proof of the declaration submitted to AT to register the start of a professional or business activity. It records the declared details, start date and tax status. The simplified declaration’s proof includes an authenticity validation code.
Collection with PedirDocumentos
With your authorisation, we retrieve this document from the authority’s portal and add it to the other documents in your request. You can track the request and view the result on the platform.
Get documentPoints to check and differences
This document confirms a tax declaration. It does not replace a professional licence, operating permission or proof of income. An old declaration may have been followed by changes or closure; check the sequence before assuming the activity is still open.
Frequently asked questions
Does tax registration authorise any profession?
No. Tax registration does not replace the licences, qualifications or permissions required for a profession. Check these with the responsible body.
Does this document prove how much I earn?
No. It proves the details declared when starting. Receipts, the IRS return or other documents for the requested period may be needed to show income.
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