I declared mine as money earnt aboard as 'Droits d'auteur' (author royalties), even though it's not strictly Royalties. It wasn't much last year, so I don't think they bothered, but this year is more. If I registered in France, I have to a business as an author. Then it gets complicated. So I might just leave it as last year and hope. There's so little information on this here, as France is slightly behind the times when it comes to this area. What about Spain?