According to the law from 10/2010 "About prevention of money laundering and terrorism financing" all credit institutions of Spain till April 30, 2015 should collect and store necessary documents for authentification of all clients which have accounts or make any bank operations.
That from clients who yet did not provide a copy of the passport or ID, it is necessary to address till April 30 in any branch of the bank where ID will be scanned and kept in a database. In certain cases, banks can demand and other documents confirming the income of the client, in the form of the reference or the declaration on the income.
In total, across all Spain, about 10 % of bank accounts were open without documents necessary at present. Thus, about three million clients should confirm the personality. All accounts which did not pass authentification till April 30 will be blocked.