If you run a holiday rental in Spain as a foreign owner, sooner or later you will read the words muy grave on an official document and wonder how worried to be. The short version: Spanish administrative law grades every offence on a three-rung ladder, and muy grave is the top rung, where fines reach six figures. The longer version, the one that saves you money, is that two completely separate fine regimes use that same ladder, and people confuse them constantly.
This guide explains the ladder in plain English and, crucially, keeps the two regimes apart, because they come from different authorities, different laws, and different amounts.
The Spanish offence ladder: leve, grave, muy grave
Spanish administrative law almost never sets a single fine for an offence. Instead it classifies each breach into one of three categories, and attaches a range of amounts to each category. The three terms you will see are:
- Leve (minor). The default for an isolated, good-faith slip. The bottom of the range.
- Grave (serious). Where things escalate: repetition, volume, deliberate concealment, obstruction.
- Muy grave (very serious). The top rung. Reserved for repeated, wilful conduct with real impact. Six-figure fines live here.
Two points an English speaker should hold onto. First, the same conduct can sit at different rungs depending on the circumstances: an isolated failure is leve; the same failure repeated across hundreds of cases, uncorrected, climbs to grave or muy grave. Second, within each rung there are usually degrees (minimum, medium, maximum), and the Administration picks the degree by weighing intent, the damage caused, your economic capacity, and whether you have reoffended.
So muy grave is not a fixed fine. It is a bracket, and where you land inside it depends on conduct.
The mistake that gets expensive: two different fine regimes
Here is the part that catches foreign owners. When people search “spain holiday rental fines” they imagine one penalty. There are two, they have nothing to do with each other, and they stack.
| Guest-registration fine | Tourist-licence fine | |
|---|---|---|
| Who imposes it | Ministerio del Interior (state) | Your autonomous community (regional) |
| What it punishes | Not filing the guest report to SES.HOSPEDAJES | Operating without your region’s tourist licence |
| Governing law | RD 933/2021 + Ley Orgánica 4/2015 | Each community’s tourism law |
| Ladder used | leve / grave / muy grave | leve / grave / muy grave |
| Where the money lands | mostly the lower rungs in practice | reaches six figures in several regions |
Two authorities. Two bodies of law. They are independent. You can have your licence perfectly in order and still be fined by the Ministry for not filing reports. You can file every report flawlessly and still be fined by your region for never having registered the dwelling. The same flat can attract both at once.
We cover each regime in depth in RD 933/2021 penalties and renting without a tourist licence in Spain. The rest of this guide reads them side by side, so the muy grave label means something concrete depending on which fine you are looking at.
Regime 1: the guest-registration fine (state, Ministerio del Interior)
This is the fine for failing to submit the traveller report to SES.HOSPEDAJES, the platform run by the Ministerio del Interior under Real Decreto 933/2021.
The decree itself sets the obligation but not the amounts. For the amounts it points to the general public-safety enforcement regime in Ley Orgánica 4/2015, de 30 de marzo, de protección de la seguridad ciudadana (the “Ley Mordaza”). That law typifies the failure to communicate lodging data as, in principle, a minor (leve) infraction.
The brackets under that regime:
| Severity | Amount |
|---|---|
| Leve (minor) | From €100 to €600 |
| Grave (serious) | From €601 to €30,000 |
| Muy grave (very serious) | From €30,001 to €600,000 |
What matters for a foreign owner acting in good faith: the default rung here is leve. Miss an isolated stay, rectify promptly, and the amount typically lands at the low end. You only climb to grave through repetition that goes uncorrected, tens or hundreds of unreported stays, deliberate concealment, or obstructing an inspection. The muy grave rung in this regime is for systematic operation outside the registry with active resistance, not for a busy host who forgot one check-in.
Enforcement sits with the Ministerio del Interior, with inspection by the Dirección General de la Policía and the Guardia Civil. In Cataluña the regional Ministry coordinates with the Mossos d’Esquadra; in País Vasco, the Basque Government’s security department with the Ertzaintza. (Note: RegistroViajero submits to SES.HOSPEDAJES today; the Cataluña and País Vasco systems are still in development.)
Voluntary acknowledgement and early payment can bring reductions of around 20% under the general rules of the administrative sanctioning procedure. The full breakdown, including the most common real cases, is in RD 933/2021 penalties.
Regime 2: the tourist-licence fine (regional)
This is the fine for marketing a tourist-use dwelling (vivienda de uso turístico, VUT) without being registered in your region’s tourist registry. It is imposed by your autonomous community, under that community’s own tourism law, and this is where muy grave gets genuinely heavy.
Regional tourism laws use the same leve / grave / muy grave ladder. Operating without registration is usually classed as grave, sometimes muy grave for repeat offences or clandestine provision of the service. The very-serious brackets reach six figures in several communities. A sample from the full table in our renting without a licence post:
| Community | Muy grave (very serious) | Law |
|---|---|---|
| Andalucía | €18,001–150,000 | Ley 13/2011 |
| Illes Balears | €50,001–500,000 | Ley 8/2012 (D-ley 4/2025) |
| Canarias | €30,001–300,000 | Ley 7/1995 |
| Cataluña | €60,001–600,000 | Ley 13/2002 |
| Comunitat Valenciana | €100,001–600,000 | Ley 15/2018 |
| Madrid | €30,001–300,000 | Ley 1/1999 |
| País Vasco | €100,001–600,000 | Ley 13/2016 |
These figures come from the regional tourism laws in force on the publication date and are revised periodically, so confirm the current amount and exact classification against your community’s law before relying on any single number. The point is the scale: the regional muy grave rung dwarfs the state one, and it is a different fine entirely.
Which licence you need, the registry name, and where to apply all vary by region. That is the subject of the tourist licence in Spain by region guide.
“Muy grave” means different money depending on the regime
Put the two side by side and the same label behaves very differently:
| Regime | Leve top | Grave top | Muy grave top |
|---|---|---|---|
| Guest report (state, LO 4/2015) | €600 | €30,000 | €600,000 |
| Tourist licence (regional, example: Balears) | €5,000 | €50,000 | €500,000 |
So when you see muy grave on a notice, the first question is not “how much” but which authority sent it. A letter from the Ministerio del Interior about SES.HOSPEDAJES is the state regime. A letter from your autonomous community’s tourism department is the licence regime. They will not arrive on the same letterhead, and they are resolved through separate procedures.
Beyond the fine: the consequences that hurt more
The regional licence regime carries penalties that are not money, and are often worse:
- Listing removal. Airbnb, Booking and the other platforms require a valid regional registration number and remove listings that don’t display one. No listing, no bookings, regardless of any fine.
- Cessation of activity. Many regional tourism laws allow the Administration to order temporary or permanent closure of the dwelling as an accessory penalty, on top of the fine.
- Reoffending escalates the rung. A second offence commonly pushes a grave into muy grave, and can end in permanent closure and cancellation of the registration.
The state guest-registration regime does not close your dwelling, but a muy grave finding there signals systematic non-reporting, which is exactly the profile that draws repeat inspection.
How a foreign owner stays off both ladders
Two obligations, two regimes, and the same simple principle for each: do the thing, and keep proof you did it.
For the licence: register the dwelling with your autonomous community before you advertise it. In most regions this is a free declaración responsable, not a slow permit. Publish the number it assigns in every listing. The step-by-step is in the tourist licence by region guide.
For the guest report: the obligation returns with every single guest. Collect their data and file it to SES.HOSPEDAJES within the deadline, every time, and keep an auditable record. Doing that by hand at volume is where good-faith hosts slip from leve into grave without noticing.
That second obligation is the one RegistroViajero automates: a phone-based digital check-in for guests in 9 languages, real-time validation, and automatic submission to SES.HOSPEDAJES, with an auditable log of every report.
That log is precisely what lowers your classification in an inspection: documented diligence is the difference between leve and grave. We do not issue tourist licences and we do not replace your community, the regional regime is yours to comply with, but the daily state obligation is the one we take off your desk.
Complying doesn’t have to be work: here’s how RegistroViajero handles the guest report.
Official source: Ley Orgánica 4/2015 on the protection of public safety (BOE) · Real Decreto 933/2021 (BOE).
This article is for general information and does not replace professional legal advice. The amounts and classifications cited come from the laws in force on the publication date and may be updated; the final classification of any infraction is decided by the competent Administration in each case. Always verify the detail against the official source, the BOE, the SES portal, or your community’s tourism registry.
