The time for doing your Spanish Income tax declaration is here again - you can start by applying for your ‘Borrador’ which is their version of your liabilities.

If it is your 1st time then a borrador is not an option.

remember to claim any tax benefits you have to be fiscally resident - ie make a tax declaration.

For more:

http://www.aeat.es/wps/portal/Navegacion2IyD?channel=af504f731aaf6210VgnVCM1000004ef01e0a____&ver=L&site=56d8237c0bc1ff00VgnVCM100000d7005a80____&idioma=es_ES&menu=0&img=19

also worth a look:
http://www.spainaccountants.com/

http://www.pellicerheredia.com/en/alicante-lawyer.aspx