Please read the info document in the Library, The Law in Spain Section, with the Law and FAQ´s on Renting a Property in Spain.
Valid for rental contracts signed between June 2013 and 18th of December 2018, and as of January 25th 2019.
Or click the link below for direct access.
Re rent increases, the link to the IGC index in the library file linked to above, is valid for contracts signed as of 31 March 2015, provided the contract mentions annual increases but no specific method of calculation. For contracts signed before that date, the following link to IPC consumer index is the one to use if the contract doesn’t mention a specific one, but irrespective of the the fact whether the contract mentions annual increases or not. The landlord must indicate in writing that he wants to increase the rent and if the tenant so wishes, provide a certificate from the Statistics Institute, confirming the relevant IPC index. Increase will be applied in the month following notification.
For info re contracts signed between December 19th 2018 and January 24th 2019. And as of March 6th 2019.