Spanish Notaries act professionally in a wide range of legal acts and transactions. This occurs either because the law specifically requires formalization through a public deed—as in the incorporation of companies—or, more generally, because the law grants significant legal effects to notarized documents. These effects are derived from the Notary’s mandatory impartiality, legal expertise, and status as a public official.

Consequently, a notarized document is enforceable and provides full proof of the date and the facts of its execution. It serves as a guarantee of the identity and legal capacity of the signatories, ensuring that the agreement has been entered into freely and voluntarily. For these reasons, it is a specially qualified instrument and, as such, is eligible for filing in the Mercantile or Land Registries, as applicable.