The autónomo tax calendar 2026: every deadline and every model
If you’re an autónomo (self-employed worker), the tax calendar isn’t something you can leave for “whenever I remember”. Every quarter you have obligations with the Spanish Tax Agency (Agencia Tributaria), and the deadlines are firm. Missing a date, even by a single day, means surcharges and late-payment interest that are perfectly avoidable if you have the dates clear.
This article is a quick-reference cheat sheet. Save it to your favourites and check it every time the quarter close approaches.