Two of the simplest and most frequent notarial services: signature authentication (legitimación de firma), where the notary certifies that a signature was made by a specific person, and certified copies (testimonios), where the notary certifies that a copy matches the original.
What you are signing
- Signature authentication: the notary states that the signature belongs to the identified person, because it was made in their presence or the person has acknowledged it as theirs. The notary does not vouch for the content of the document, which remains the signatory’s responsibility.
- Certified copy: the notary certifies that the photocopy is identical to the original document shown to them.
Transactions and documents
Signature authentication
Documents
- Valid ID, NIE or passport of the signatory.
- The document to be signed, preferably unsigned, so it can be signed in the notary’s presence.
Signatures cannot be authenticated on documents that must by law be executed as a public deed, or on unlawful documents.
Certified copy
Documents
- The original document.
- The copy, or we can make it at the office.
Authentication of a translator’s signature
When a document must be submitted in translation, the notary can authenticate the translator’s signature.
Documents
- Original, translation and the translator’s ID; the translator must sign before the notary.
Frequently asked questions
Do I need an appointment to authenticate a signature?
We recommend calling first, although it can usually be done on the spot during office hours.
Is an authentication valid for a document to be used abroad?
Yes, although you will usually also need a Hague apostille or the relevant legalisation.
Identity documents (common to all transactions)
Individuals
- Valid ID card, NIE or passport.
- Marital status and, if married, your matrimonial property regime (and any marital agreement deed).
- Foreign nationals need an NIE (foreigner identification number) for transactions with tax implications.
Companies
- Deed of incorporation and current articles of association, recorded at the Commercial Registry.
- The company’s tax ID (NIF).
- Deed appointing the director, or the representative’s registered power of attorney.
- Details for the beneficial ownership declaration.
If you act on behalf of someone else
- Authorised copy of the notarial power of attorney.
This information is for guidance only. Depending on the circumstances, the notary’s office may request additional documents.