Short answer
The notary or your lawyer usually handles registration at the Conservatória do Registo Predial right after the deed. You should confirm who is responsible and get the registration number and a certidão permanente. Registration is what makes your ownership official and public; without it, your title is not fully protected. Ask for proof of registration and check the official IRN website for details.
General information, not legal or tax advice. Rules and amounts change: confirm with official sources.
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