Blog
Guides
Long-form explainers on residency, FBAR, IRPF, autónomo, and more.
Glossary
Plain-English definitions of the forms, rules, and concepts across both systems.
Founder notes, product updates, and posts on the US–Spain tax experience.
Why I Built HolaSam
My US tax life was on autodrive. Then I moved to Spain and everything changed. Here is why I started HolaSam.
9 June 2026