Everything to prepare in Spain before traveling, and what you'll need to handle right after you arrive.
This is the most urgent step, and the one that unlocks everything else (residence permit, health insurance, etc.). You must show up in person at the Contrôle des habitants / Einwohnerkontrolle of your municipality, usually within 14 days of arrival. You'll typically need:
This same process is what triggers your L or B permit — see the permits guide.
Get certified translations and the apostille before you travel — handling Spanish translations from Switzerland is slower and more expensive. Always carry both physical and digital copies of everything.