AL or short-term rental? The legal boundary that determines your taxes and obligations

One question comes up more often than you'd expect in owner groups: "Is my property alojamento local or just a rental?" It sounds obvious. Often it isn't.

The distinction matters — a lot. The regime your property falls under determines which taxes you pay, what obligations you have towards guests, which licences you need, and even what rules apply when something goes wrong. Mixing the two up isn't just an administrative slip; it can have real fiscal consequences.

What defines alojamento local

Alojamento local (AL) is a specific legal regime created for the provision of temporary accommodation services to tourists, for payment. The key word is services: AL isn't simply handing over a space — it involves a hospitality component, even if a minimal one.

Some characteristics that typically place a property in the AL regime:

• Stays are short-term and aimed at tourists or travellers
• The property is registered with the Câmara Municipal and has an AL registration number
• The owner provides (or makes available) services associated with the stay — cleaning, bed linen, check-in, and so on
• The activity is carried out on a habitual basis, even if seasonal

Registration is mandatory and comes before everything else. Without an AL number, the activity isn't legal — regardless of what you call it.

What defines a rental agreement

Arrendamento — including what's sometimes called short-term rental — is a civil contract between landlord and tenant. The relationship is different: you're transferring the use and enjoyment of the property, not providing an accommodation service.

In a rental arrangement, even if the duration is short, what exists is a lease contract governed by the Civil Code and urban tenancy law. There's no AL number, no obligation to report guest data to AIMA, and the tax treatment is different.

The length of the stay alone is not the only criterion that separates the two regimes. A one-week contract can be a rental; a stay of several months can be AL, depending on the nature of the relationship and the services provided.

The grey area that catches people out

The problem arises when owners list their property on platforms like Airbnb or Booking and assume that automatically makes it AL. It doesn't always.

Equally, some owners draw up short-term rental contracts thinking that sidesteps AL obligations. That may work in certain cases, but it can also look like an attempt to circumvent the regime — with the risks that brings.

The criteria that tax and tourism authorities tend to examine include:

• The nature of the services provided: is there cleaning, breakfast, or other typical hospitality services?
• The profile of the users: are they tourists or people with a temporary housing need?
• How the property is marketed: on tourism platforms or rental portals?
• The existence (or absence) of an AL registration number

None of these factors is decisive on its own. The correct classification comes from looking at the picture as a whole.

Why the distinction changes your taxes

The two regimes have distinct tax treatments under IRS. AL income falls into a specific category with its own coefficients and deductions. Rental income falls into a different category with different rules.

This means the same gross revenue can produce a different tax bill depending on the regime — and that declaring AL income as rental income (or vice versa) is a mistake with real potential to trigger corrections, interest, and fines.

Beyond IRS, there are differences in:

• VAT: AL carries specific obligations depending on turnover and the type of services offered
• IMI: the designated use of the property can influence the applicable rate
• Municipal levies and fees: some câmaras apply charges specific to AL activity

Operational obligations also differ

In AL, you have obligations that simply don't exist in a straightforward rental:

• Reporting guest data to the relevant authorities
• Complaints book (physical or electronic)
• Civil liability insurance
• Mandatory notices displayed in the property
• Compliance with safety requirements set out in the legislation

In a rental, the obligations are different — centred on the contract, registration with AT, and compliance with urban tenancy rules.

Blurring the two operationally is a reliable way to fall short on both.

Keeping things clear when you have both

Some owners have properties in both regimes — one apartment in AL and another on a long-term lease, for example. In that case, organisation is everything.

A few practices that help:

• Separate the documentation for each property by regime, not just by address
• Use distinct categories in your management tools so you don't mix up income streams and obligations
• Review the classification whenever you change how you market a property — switching platform or type of stay can shift the applicable regime
• Consult an accountant when there's genuine doubt about the classification — the cost of one conversation is always less than the cost of a tax correction

The practical rule of thumb

If you have an AL registration number and you're listing the property on tourism platforms with associated services, you're in AL. If you have a signed lease with an identified tenant, you're in arrendamento.

When your situation doesn't fit neatly into either of those descriptions, it's worth pausing to work out exactly where you stand — before AT does it for you.