In accordance with the provisions of Law 11/2021, of July 9, on measures to prevent and fight tax fraud:

“Operations in which any of the intervening parties act as an entrepreneur or professional, with an amount equal to or greater than 1,000 euros or its equivalent in foreign currency, cannot be paid in cash. However, the aforementioned amount will be 10,000 euros or its equivalent in foreign currency when the payer is a natural person who justifies that he does not have his tax domicile in Spain and does not act as an entrepreneur or professional.”

Important: The way in which you must prove that you do not have your tax domicile in Spain is through the CERTIFICATE OF TAX RESIDENCE of your country.