In order to obtain the Spain golden visa, you have to inform yourself about the documents that you have to present. Here you can see some of them but you must keep in mind that every case is different depending on the investment that you are going to make.
If you want to obtain the Spain golden visa through the investment in immovable property, you must provide as proof of the purchase of the property the certification of domains and charges of the Land Registry and the deed of purchase of real estate.
In the case of investing in Spanish shares or participations you have to provide a declaration of the investment from the Investment Registry of the Ministry of Economy in the case of participations; and a certificate from the financial intermediary registered with the National Securities Market Commission (Comisión Nacional de Mercado de Valores) for the purchase of shares.
If what you want to do is to invest in Spanish public debt, it will be necessary a certificate from the Bank of Spain or the financial entity with which you have managed the investment in which can be clearly seen how you are the holder of that purchase.
For investments in bank deposits, you will need the certificate issued by the financial institution with which you have contracted the deal, which states that you are the sole holder of that deposit.
If you want to start a business project, prior to applying for a visa or authorization, a favorable report must be requested on the entrepreneurial and business activity to be carried out in Spain.
Along with these documents, you must also present your identity card or passport, a public or private medical insurance with an entity operating in Spain, the criminal record document and proof of financial means.
A really important thing to keep in mind about getting the Spain Golden Visa is that all documents must be translated into Spanish and the foreign public documents must also bear the Apostille of The Hague Convention or, failing that, they must have been legalized through diplomatic channels.