Article from La Provincia about tax returns.
https://translate.google.com/translate?sl=es&tl=en&js=y&prev=_t&hl=en&ie=UTF-8&u=http%3A%2F%2Fwww.laprovincia.es%2Fespeciales%2Fdeclaracion-renta%2F&edit-text=&act=url
The Spanish version here.... http://www.laprovincia.es/especiales/declaracion-renta/