IRS tax reduction in 2026: Why renting out a room in your primary residence in Portugal is becoming highly profitable

Do you have an unoccupied room in your house or apartment in Portugal? In an economic context marked by inflation and an unprecedented housing crisis, many homeowners are looking for solutions to generate extra income. At Roomlala, we know that taking the step into homestay rentals can sometimes raise questions, especially regarding administrative and tax matters. Good news: the 2026 tax regulations for room rentals in Portugal have been completely redesigned by the government to benefit you significantly. To encourage putting housing and rooms on the market for long-term stays, the Portuguese state has deployed an arsenal of highly incentivizing tax measures. Gone are the days when taxes gobbled up the majority of your rental income! Today, renting out a room in your own home in Portugal has never been safer, more legal, and above all, more profitable. In this comprehensive article, we break down the very latest legislative developments for you. You will discover how to optimize your yields, drastically reduce your income tax (IRS), and secure your process through long-term leases.

Housing Law Portugal 2026: The new tax landscape for homeowners

To understand the opportunity available to you this year, we must look at the recent 2026 Portugal housing law. Faced with a shortage of affordable housing, particularly in cities like Lisbon, Porto, or Faro, the government has enacted Decree-Law no. 97/2026. This new tax package has a clear objective: to discourage short-term tourist rentals in favor of traditional residential rentals. At Roomlala, we observe that this transition perfectly matches the expectations of our community, which is looking for stable accommodations for students or young professionals.

Read also: Start of the 2026 academic year in Portugal: The legal guide to student room rental agreements, Student housing Canada 2026: What is the impact of the new cap on room rentals? and Student housing shortage in Switzerland: Homestay, a vital solution for 2026

Historically, rental income from real estate (category F of the IRS) was taxed at a flat rate of 28%. In 2026, the standard rate was lowered to 25%. This is already a first victory for your purchasing power. However, applying this standard 25% rate would be a strategic mistake if you intend to rent long-term. The legislator has indeed implemented a system of extremely powerful degressive tiers. The more you commit to the duration with your tenant, the lighter your tax burden becomes. This philosophy aims to stabilize the market and offer peace of mind to both the tenant and the host homeowner.

It is essential to note that renting a room in your own home in Portugal falls fully within the scope of these measures. Whether you are renting out a converted outbuilding, an unoccupied master suite, or a simple student room, the generated income is eligible for these tax reductions, provided you comply with the reporting rules. We will see in detail how these scales are structured and how you can, in some cases, reduce your tax to zero.

Long-term rental IRS reduction: Detailed scales for 2026

The long-term rental IRS reduction is the heart of the new tax scheme. The Portuguese government has segmented the benefits based on the duration of the lease agreement you sign with your tenant. At Roomlala, we often encourage our hosts to prioritize student rentals for a full academic year, or multi-year leases for young professionals, to maximize these benefits.

Deductions according to lease duration

If you opt for a traditional rental agreement, the 25% tax rate literally melts away as the lease duration increases. Here are the official tiers in effect for 2026:

• From 5 to 10 years: The tax rate goes from 25% to just 15%. This is a massive reduction that mechanically increases your net profitability.
• From 10 to 20 years: The rate drops to 10%. Ideal if you are hosting a reliable tenant who wants to settle in for the long haul.
• More than 20 years: The rate is reduced to a symbolic 5%.

Let's take a concrete example to illustrate this. Imagine Maria, a homeowner in Lisbon, rents a room in her apartment for €400 per month to a master's student, with a 5-year renewable contract. Instead of paying €1,200 in annual IRS (at a 25% rate), she will only pay €720 (at a 15% rate). That is a net saving of €480 per year, simply by formalizing a contract for the right duration.

The special "moderate rent" rate and total exemption (RSAA)

But the true revolution of the 2026 law lies in affordable rent schemes. The government has established a special ultra-reduced rate of 10% for all housing contracts known as "moderate rent." To benefit from this, the rent of the room (or the entire home) must not exceed a monthly ceiling set at €2,300. In the context of renting a room in a homestay, this ceiling is extremely generous and allows you to be eligible for this 10% rate almost systematically.

Better yet: the new Simplified Affordable Rental Regime (RSAA). If you agree to rent your room at a rate 20% lower than the median rent in your municipality, and you sign a lease of at least 3 years, you benefit from a total IRS exemption (0% rate). For example, if João in Porto notes that the median rental for a room in his neighborhood is €500, and he decides to offer his on Roomlala at €400 with a 3-year lease, he will pay absolutely no tax on this income. It is a win-win strategy: the tenant gains access to affordable housing, and the homeowner maximizes their net yield while avoiding rental vacancy.

Taxation of room rentals in Portugal 2026: How to optimize your deductions and monetize your space?

In addition to rate reductions, the 2026 taxation for room rentals in Portugal allows you to optimize your taxable base. Indeed, the Portuguese Tax Authority (AT) allows homeowners to deduct a number of expenses from their gross rental income. This is an often overlooked aspect of homestay renting, but one that proves extremely effective in lowering the tax bill.

Deductible expenses from your gross rental income

When you rent out a portion of your primary residence, you cannot deduct all household expenses. However, you are perfectly entitled to deduct these costs in proportion to the rented surface area. Expenses eligible in 2026 include:

• IMI (Imposto Municipal sobre Imóveis): The equivalent of property tax.
• Multi-risk home insurance: Mandatory and provides security for your property.
• Condominium fees: If you live in an apartment building.
• Energy certificate: Required for putting a property on the rental market.
• Maintenance and repair work: Painting, plumbing, electricity for the rented room.

Imagine that your apartment is 100 m² and the rented room represents 15 m², with shared access to common areas valued at an additional 10 m². You are therefore renting out about 25% of your living space. You will be able to legally deduct 25% of your IMI bill, 25% of your condominium fees, and 25% of your insurance premium from your gross rental income before tax is calculated. At Roomlala, we advise you to carefully keep all your invoices (faturas com NIF) to justify these deductions during your annual IRS declaration.

Reinforced attractiveness for tenants: an asset for homeowners

Why is it so crucial to offer a proper and formal contract? Simply because tenants have become extremely demanding on this point, and for good reason: the 2026 Portugal housing law also considered them. The tax deduction ceiling on IRS for tenants has been significantly increased, from €700 to €900 annually. A student tenant or a young professional therefore has a major financial incentive to demand an official contract and electronic receipts. By renting your room in a totally transparent and declared manner on Roomlala, you attract the best profiles, those who are solvent, serious, and eager to settle in long-term to benefit from their own tax advantages.

Legal points of vigilance to secure your tax benefits with Roomlala

While the legal framework is particularly generous, it requires, in return, impeccable administrative rigor. The Portuguese government is actively fighting against the underground economy, and non-compliance with procedures leads to the immediate loss of IRS reductions, with an automatic return to the standard punitive rate, accompanied by possible fines.

The first absolute point of vigilance concerns the registration of the contract. For the long-term rental IRS reduction to apply, your lease agreement must be registered on the Portal das Finanças within a maximum period of 30 days after signing. It is also mandatory to issue electronic rent receipts (recibos de renda eletrónicos) each month via this same portal. At Roomlala, we facilitate connections with trusted tenants, but it is your responsibility to finalize this simple yet mandatory administrative step with the Tax Authority.

Next, it is crucial to distinguish residential rentals from tourist rentals. Short-term rentals under the Alojamento Local (AL) regime are strictly excluded from these tax benefits. To benefit from the reduced rates (15%, 10%, 5%, or 0% via the RSAA), the room must obligatorily serve as the tenant's permanent primary residence or as long-term student housing. Seasonal contracts of a few weeks for vacationers are not eligible.

Finally, be careful about rent ceilings if you are aiming for the 10% rate or the RSAA exemption. Failure to comply with the maximum authorized amounts or the absence of communication of the contracts to the AT will retroactively cancel your benefits. In conclusion, renting out a room in your primary residence in Portugal in 2026 is a fantastic financial opportunity. By relying on a secure platform like Roomlala to find the ideal tenant and by strictly following the registration procedures, you ensure stable, sustainable, and tax-optimized additional income. Do not wait any longer to add value to your unoccupied space and actively participate in the housing solution in Portugal!