Legal background

What the Catalan guest registry actually is

The Catalan guest registry — in Catalan, Registre de Viatgers dels Mossos d'Esquadra — is the system through which every accommodation provider operating in Catalonia reports the identity and stay details of each guest to the Generalitat's police force. It exists because of a six-decade-old Spanish public-security obligation, refreshed and digitised in 2021, and it lives separately from the national system because Catalonia's regional police force has full competence over public security on its own territory. For an owner based outside Spain, the system is not optional, is not the same as the national platform, and is the channel you must use if your property is anywhere in the four Catalan provinces.

The obligation goes back to 1959

Spain has required accommodation providers to identify the people they host and to report those identities to the police since the Decreto 1513/1959. Throughout the 1960s, 70s and 80s, every hotel in Spain kept a physical libro registro — a guest book — and copies of the daily entries were physically delivered or, later, faxed to the local police station. The system had no central database, no real-time visibility and limited use for security purposes, but it formalised a duty that has remained intact in substance ever since: the State, through its security forces, expects to know who is staying overnight in commercial or quasi-commercial accommodation on its territory.

In 2003 the Orden INT/1922/2003 updated the regime, standardised a paper form called the parte de viajeros, and clarified the data that had to be collected. By the 2010s, when Airbnb, Booking.com, Vrbo and similar platforms drove an explosion of short-term holiday rentals — particularly in cities like Barcelona — the 1959 framework was visibly inadequate: paper forms scattered across thousands of small operators, no way to cross-check data, no central record of who held an accommodation activity at all.

The response was the Real Decreto 933/2021, de 26 de octubre, published in the Spanish official gazette on 28 October 2021. It expanded the list of obligated operators to include every kind of tourist accommodation, increased the granularity of the data required, and replaced paper with mandatory electronic submission. After two delays granted to industry, the new framework became fully enforceable on 2 December 2024, with formal enforcement proceedings starting in 2025.

Why Catalonia operates a separate system

The reason Catalonia uses the Mossos d'Esquadra portal rather than SES.Hospedajes is constitutional and political, not technical. Under the Spanish Constitution and the Catalan Statute of Autonomy (Estatut d'Autonomia de Catalunya), Catalonia exercises full competence in matters of public security on its own territory through its integrated regional police force, the Mossos d'Esquadra. This is one of two regional police forces in Spain with that level of competence — the other being the Ertzaintza in the Basque Country. As a result, in matters where data is collected for public-security purposes, both regions operate parallel systems administered by their own forces rather than feeding into the national Ministry of the Interior platform.

In practice the Generalitat de Catalunya, through the Direcció General de la Policia, runs a separate portal at registreviatgers.mossos.gencat.cat. The substantive data requirements are materially equivalent to those of the national Anexo I — the same fields, the same 24-hour reporting deadline, the same three-year retention — but the channel, the credentials, the technical schema, and the support function are different. An owner who has registered with SES has not registered with Mossos and is not in compliance for a Catalan property; the systems do not talk to each other.

Who is treated as an accommodation provider

The Mossos guest registry catches the same broad list of operators as the national system. If your property is in Catalonia and falls into any of the following categories, you are covered:

• Hotels, hostals, pensions, paradors — traditional accommodation businesses with rooms for hire.
• Tourist apartments and aparthotels — including the operator of a single licensed unit.
• Habitatges d'ús turístic (HUT/HUTB) — the Catalan tourist-rental category that covers a substantial share of foreign-owned holiday properties in Barcelona, the Costa Brava, the Costa Daurada, the Pyrenees and other tourist areas.
• Rural houses (cases rurals) — including converted masies and farmhouses popular with British and Northern European owners.
• Campsites, mountain refuges, youth hostels — and equivalent providers.
• Intermediation platforms — Airbnb, Booking.com, Vrbo, Expedia and so on. They have a separate, parallel obligation to report bookings and cancellations, which does not replace the owner's obligation to report the guest at check-in.

The legal status of the operator — Spanish company, Spanish-resident individual, UK-resident individual, US LLC owning a Spanish property — does not change which obligations apply. It only changes the practical route to comply.

Professional and non-professional operators

The framework distinguishes professional from non-professional hosts. Both must communicate guest data to the Mossos within 24 hours; only professionals are obliged to keep the formal three-year documentary archive. A professional host operates regularly as a business and is normally registered in the Catalan tourist registry; a non-professional is, broadly, someone letting occasionally — for example a second home rented for a few weeks each summer.

For non-resident owners the line can be blurry. Owning one property and letting it out year-round through Airbnb, even from abroad, is generally treated as a professional operation. Owning one property and letting it for two weeks of August while living in it the rest of the year may not be. The line matters for the three-year archive duty; it does not affect the obligation to report every guest. When in doubt, the safer course is to keep the archive: it is far better to have records you weren't strictly required to keep than to lack records you were.

The data the law collects

The Mossos portal collects approximately seventeen data points per guest, with a few additional fields depending on document type and the presence of minors. These cover the guest's identity, residence and contact details, plus the contract data for the stay itself (booking reference, check-in and check-out, number of guests, type of payment). For Spanish documents (DNI, TIE) there is an additional field — the número de soporte, a separate document-issuance identifier — that frequently catches first-time filers out. For non-Spanish passports the support number is not collected.

The data is collected for a defined purpose: public security. The Spanish data-protection authority (Agencia Española de Protección de Datos) has been explicit that the obligation does not authorise photocopying or scanning the guest's passport or ID card. What you record are the specific fields listed in the regulation, not an image of the document. A visual check at the door, or against the document during a pre-arrival video call, is acceptable; storing a copy of the document is a separate, sanctionable breach of GDPR.

The credentials problem — and why it disproportionately affects foreign owners

The Mossos portal accepts identification by a Spanish Digital Certificate issued by the FNMT, or by activated Cl@ve credentials. These mechanisms are designed around a Spanish administrative identity — typically a NIF (for Spanish citizens) or a NIE (for resident or non-resident foreigners who have obtained a Spanish identification number). Without a NIF or NIE you cannot apply directly for an FNMT certificate, you cannot enrol in Cl@ve, and the portal therefore does not recognise you.

A US, UK, Canadian, Australian or other non-resident owner with no NIE is in this position by default. The standard solutions are:

• Apply for an NIE — at the Spanish consulate in your home country, or in person in Spain. The NIE is a foreigner's identification number; it does not make you tax-resident. With a NIE you can then apply for a Digital Certificate (typically requiring a video or in-person verification appointment) and operate the portal directly.
• Appoint an authorised representative — a Spanish-resident individual or company with their own valid Digital Certificate, formally authorised to act on your behalf before the Mossos and the Generalitat. This is the most common practical path for owners who do not plan to spend significant time in Spain.
• Use a specialist compliance service — which is functionally a particular form of authorised representation, packaged for the use case.

None of these paths is fast. The application for an NIE through a Spanish consulate abroad can take several months; the certificate itself, once you have a NIE, is another administrative step. Most foreign owners conclude that for a single holiday property the representative route is far more proportionate than building Spanish administrative identity from scratch.

How the Catalan and national regimes differ in practice

The two systems share their substantive obligation but differ on enough operational points that it is worth setting out the practical contrasts directly.

The "manual file upload, no public API" line is the operationally significant one. SES.Hospedajes offers a REST API, which means specialist services can integrate directly with it; the Mossos portal currently requires a structured file upload, which means automation is built around a slightly different and more brittle pipeline. This is a moving target — the Generalitat is expected to add API access in time — but as of mid-2026 it remains the case.

Related obligations: licensing and tourist tax

Two adjacent obligations frequently overlap with guest registration in the foreign-owner's mind and are worth situating here.

The HUT or HUTB tourist-rental licence is a precondition to letting a residential property to tourists in Catalonia. The number must be obtained from the Generalitat (or the Barcelona city council for Barcelona properties), must be displayed on every listing, and must remain valid. The licence regime has its own rules on number caps in some areas, restrictions in others (Barcelona has effectively frozen new HUT issuance), and renewal cycles. Guest registration does not substitute for the licence and the licence does not substitute for guest registration; they coexist.

The Catalan tourist tax (Impost sobre les estades en establiments turístics) is levied on overnight stays in tourist accommodation. The host collects it from guests, files a periodic return with the Agència Tributària de Catalunya and remits the collected amount. It is administered separately from guest registration and has its own deadlines and forms. Some compliance services bundle the two; many do not.

The Mossos guest registry is the operational expression, in the daily life of every Catalan holiday rental, of an obligation that Spanish public-security law places on accommodation providers wherever they are based. For a foreign owner, the substantive rules are not negotiable; what is negotiable is who actually clicks the keys.