Hotels and other tourism operators will have to collect and report over 40 pieces of information for accommodation bookings and over 60 for car rental bookings.
From Euronews, starting today, tourists arriving in Spain will have to provide more personal data to authorities.
Information requested will include home address and their relationship to children travelling in the same party.
Data will be collected by hotels, holiday rentals, campsites, travel agencies and car rental companies.
Spanish officials say the increased checks, part of a royal decree, are part of a wider crackdown on organised crime.
However, hotels have been protesting the introduction of the rules saying it will negatively impact the visitor experience.