This link, http://www.agenciatributaria.es/ will take you to the information that you will need to know about the latest tax information and what needs to be collected, as well as paid in Spain. The Spanish Tax Agency (Agencia Tributaria) is set up to answer any questions that you might have about the laws in Spain for taxes. This is especially important for establishments that deal with tourism in Catalonia.
Should you be a host in Catalonia for accommodations, you may be asked to collect a tax with the regulations that govern establishments as such. This could in turn affect clients.
For tourist establishments tax information in Catalonia, you will find this link to be very helpful, http://etributs.gencat.cat/es/tributs/. This Generalitat de Catalunya website gives a great overview of what you need to do in order to receive, fill out and submit the necessary paperwork for your taxes this year.
In order to be in check with the Spanish laws, we sent this letter to you so that you could be reminded of your applicable, financial obligations. In all cases, it is you that need to file your taxes, so it is important that you are up on the laws that are put in place for them.