Registering with Spanish social security: the expat guide

If you come from a Nordic country, you've spent your life inside one seamless system: personnummer or CPR number, automatic coverage, one card. Spain splits things you're used to seeing merged — the public health system runs through the Seguridad Social, coverage follows your activity status rather than mere residence, and your home registration doesn't transfer. The counterpart: you need to know which of the four doors is yours.

Step zero for everyone: the social security number (NUSS)

No NUSS, no work contract, no autónomo registration, no affiliation. The good news: it's one of Spain's easiest procedures. Apply online at Import@ss, the Social Security Treasury's portal, with your NIE and ID — a reply arrives within days, usually without any physical appointment. No NIE yet? Start with our Nordic NIE guide.

The four entry doors, by profile

Three clarifications that answer the questions every Nordic arrival asks:

• Pensioners: the S1 is your golden document

  Request the S1 (EU portable document) from Försäkringskassan, Udbetaling Danmark, Helfo or Kela BEFORE departure, file it with the Spanish INSS: you access the Spanish public system while your home country pays. Norway and Iceland are covered through the EEA arrangements — same mechanism.

• Posted workers and teleworkers: your case is decided BEFORE

  If you stay in your home system (posting, telework framework agreement), the A1 document plus your EHIC cover you — not a Spanish affiliation. The four possible set-ups are mapped in our remote-work-from-Spain guide.

• Your home coverage doesn't follow you

  Once Spanish-resident, your Nordic public coverage ends outside the EU mechanisms — and deregistering from the population register usually triggers exactly that. Sequence matters: secure your Spanish door before closing the Nordic one.

What changes day to day (and surprises Northerners)

Spain's public system has no user fees at the point of care: GP visits, referred specialists, hospitalisation — free when you use them. Medicines carry income-based co-payments (10-60%). The trade-offs: your GP is assigned by address through the SIP card rather than freely chosen, and specialist waiting times can be long — which is why many expats combine public coverage with light private insurance (€30-60/month); our EHIC vs private insurance comparison gives the orders of magnitude.

On the self-employed side, RETA contributions are income-based — amounts and the first-year tarifa plana are detailed in our autónomo, cooperative or SL comparison.

Your roadmap, in order

1. NIE → NUSS via Import@ss (both can be done before you even have a job).
2. Empadronamiento — required for the SIP card.
3. Alta through your door (employer, RETA, S1 at the INSS).
4. SIP card at your health centre — and you're in the system.

The Social Security's general portal for checking your rights, contributions and work history: seg-social.es — your "vida laboral" report is available online with Cl@ve, a control habit worth adopting from your first contribution.