You’ll have to fill out a tax return form - Declaracion de la Renta. You are too late for tax year 2010 though. You can file the declaration from April (I beleive) until the end of June. If your Spanish is good enough and you understand financial jargon, you can do it yourself with the PADRE program from Hacienda, but I always use my gestor, it costs me about 60?. You and your wife can declare jointly, and this usually works out better if one or both of you doesn’t work. Come April you will see ads all over the place for gestors who will do your declaration.