Taxation and room rentals in Switzerland: How to declare your rental income in 2026

Faced with the housing shortage affecting many Swiss cities, welcoming a tenant into your home has become an essential solution. At Roomlala, we see every day how this practice creates social bonds while providing a welcome source of extra income. However, when it comes to addressing the taxation of room rentals in Switzerland, many hosts hesitate, fearing administrative complexity. Rest assured: renting out part of your primary residence is 100% legal and even encouraged by the authorities, provided you show fiscal transparency.

In this year 2026, the Swiss tax landscape is going through a fascinating transition period. Between the old rules still in force and recently passed reforms, it is crucial to fully understand your obligations. How can you successfully complete your rental income tax return in 2026? What is the impact on your rental value? What deductions are authorised by the Federal Tax Administration? We guide you step-by-step so that you can rent out your room with peace of mind.

See also: Student accommodation in Flanders: Everything you need to know about the student lease for the 2026 academic year, Back to school 2026 in Italy: The benefits of the Canone Concordato for renting out your room and Regulation of short-term rentals: What changes for students in Spain at the start of the 2026 academic year

Understanding the legal and tax framework for homestays in 2026

Welcoming a student or a young professional into an unoccupied room in your house or apartment is not just a supportive gesture; it is also an activity regulated by law. The room rental legislation in Switzerland is very clear on this matter: any income generated by renting out a property, even partially, constitutes taxable income. At Roomlala, we make it a point of honour to support you in understanding these rules to guarantee a worry-free experience.

In Switzerland, the basic principle of housing taxation is based on contributory capacity. If you receive rent every month, this increases your overall income. It is therefore imperative to declare these amounts to your canton's tax administration. Failing to do so would expose you to unnecessary tax adjustments, especially since authorized deductions often make the operation very advantageous.

It is also important to remember that renting a furnished room in a homestay benefits from great contractual flexibility. You remain in control of your home. However, on the tax front, the Federal Tax Administration (FTA) does not make a fundamental distinction between a large apartment rented to a third party and a room rented in your own home: income must be declared accurately.

To illustrate this, let's take a common use case on our platform: you decide to rent a 15 m² room to a student from the University of Lausanne for 800 CHF per month, including utilities. Over a full year, this represents a gross income of 9,600 CHF. It is this exact amount that will have to appear in the section dedicated to real estate income in your 2026 tax return.

The 2026 rental income declaration: an obligation of transparency

Completing your tax return can sometimes seem tedious, but cantonal forms have been greatly simplified in recent years. The 2026 rental income declaration is generally done in the section reserved for real estate investment returns. You will need to indicate the total amount of rent received during the previous calendar year.

It is crucial to differentiate net rent from utilities (water, electricity, internet). If you rent "all utilities included", as is often the case for a homestay, part of what you receive is used to cover the tenant's actual consumption costs. Depending on the canton, you may be able to deduct these incidental expenses from your gross taxable income, provided you can justify them or apply a recognized flat rate.

At Roomlala, we advise you to keep a small, precise record of your receipts. Keep the rental agreements generated on our platform as well as proof of bank transfers. This transparency is your best ally in case of any queries from the cantonal tax authorities.

Finally, remember that this declaration obligation applies from the very first franc received. There is no "tolerance threshold" or exemption for small amounts in Switzerland. Rigour is required, but as we will see, it comes with very attractive rights to deductions.

Swiss rental value: what is changing (and what remains) in 2026

The Swiss rental value is arguably the most debated tax concept in the country. As a reminder, it is a fictional income that owner-occupiers must add to their taxable income. The idea is to create fiscal equity between tenants (who cannot deduct their rent) and owners (who can deduct their mortgage interest and maintenance costs).

But what happens when you rent out part of this primary residence? This is where the system requires particular attention to avoid any fiscal injustice. In 2026, adjustment rules are of paramount importance for Roomlala hosts.

The reform calendar: no need to panic before 2029

You have probably heard about the historic September 2025 vote approving the abolition of the rental value. This is excellent news for owners, but pay attention to the timeline! The Federal Council has set the entry into force of this major reform for 1 January 2029. Consequently, the current tax system remains fully applicable in 2026, 2027, and 2028.

You should therefore not anticipate the end of the rental value in your current declaration. You must continue to declare it. The good news is that during this transition period up to and including the end of 2028, all benefits linked to deductions (notably the interest on your mortgage debt) are maintained in full. This is therefore the ideal time to optimize your taxation while hosting a tenant.

We wish to reassure our community: this transition period has been designed to give you time to adapt. At Roomlala, we closely follow these legal developments to provide you with information that is always up-to-date and secure.

Avoiding double taxation: the pro-rata adjustment

This is the question every owner asks us: "If I declare the rent for the room, and I also declare the rental value of my entire house, won't I be paying taxes twice on this same room?" The answer is no; the tax administration has provided a mechanism to avoid this double taxation.

Since the actual rent of the room is already taxed, you have the right to adjust or reduce the overall rental value of your property in proportion to the surface area rented. This pro-rata calculation is essential for optimizing your declaration.

Let's take a concrete example: you own a 100 m² house with an annual rental value set at 15,000 CHF. You decide to rent a 20 m² room (which is 20% of the total surface area) on Roomlala. You will declare the rent received for this room, but in return, you will be able to reduce your rental value by 20%. You will therefore only declare 12,000 CHF in rental value.

Be careful, however, with cantonal specificities: some cantons require you to fill out a specific attachment to justify this calculation, while others include a dedicated box in their tax declaration software. Check with your local tax office to find out the exact procedure to follow.

Authorized tax deductions: optimize your 2026 declaration

While renting out a room generates taxable income, it also gives you the right to important tax deductions. The Federal Tax Administration recognizes that maintaining a property in a rental-ready state incurs costs. In 2026, these deductions remain a powerful lever for reducing your overall tax burden.

It is fundamental to understand how to articulate these deductions with your rental income and your residual rental value. You generally have the choice between two methods: the deduction of actual costs or the application of a flat-rate deduction.

Maintenance costs: actual or flat-rate?

As a landlord, even for a simple room, you can deduct the maintenance costs of your home. The flat-rate method is often the simplest: it allows you to deduct a percentage (generally 10% to 20% depending on the age of the building) of the rental value and/or rental income, without having to provide receipts.

However, if you have carried out major work to accommodate your tenant, deducting actual costs will be much more advantageous. Work that maintains value (painting, replacing a window, repairing plumbing) is considered deductible. Value-added work (adding a luxury bathroom that did not exist before) is generally not.

Use case example: Before listing your room on Roomlala, you hired a tradesperson to repaint the walls and change the flooring, for a total of 3,500 CHF. If this amount exceeds the 10% or 20% flat rate you are entitled to, it is in your best interest to opt for the deduction of actual costs that year, by attaching the invoices to your declaration.

We recommend that you run a simulation every year. The choice between actual costs and flat rate is not definitive; you can opt for one or the other with each new tax return depending on the expenses actually incurred during the calendar year.

Mortgage interest deduction maintained

As mentioned previously in the reform calendar, mortgage interest remains fully deductible from taxable income until the end of the transition period, i.e., until 31 December 2028. This is a crucial piece of information for your 2026 financial planning.

The additional income generated by renting your room on Roomlala can thus be partially or totally offset by the deduction of this interest, as well as by maintenance costs. In many cases, the actual tax impact of renting out a room proves to be minimal compared to the net financial benefit you receive.

It is therefore strategically very relevant to rent out a room in your primary residence during this period. You maximize the use of your property while taking full advantage of the current tax ecosystem before the big shift in 2029.

Cantonal specificities and best practices for worry-free renting

Switzerland is a federalist country, and taxation is no exception to the rule. While the general framework described above is set by the Confederation (direct federal tax), the exact calculation of the rental value, tax rates, and the exact percentages of flat-rate deductions vary considerably from one canton to another.

For example, the tax authorities of the cantons of Vaud, Geneva, or Zurich do not have exactly the same real estate valuation scales. It is therefore essential to insist on these cantonal specificities: what is true in Lausanne is not necessarily true to the last franc in Winterthur.

To rent with complete peace of mind with Roomlala, here is a list of best practices to adopt in 2026:

• Consult your canton's guidelines: Visit your cantonal tax administration's website to download the 2026 explanatory note regarding housing taxation.
• Formalize the rental: Use Roomlala's messaging and booking tools to keep a clear written record of rental dates and amounts received.
• Separate utility costs: If possible, clearly specify in your communications which part of the rent corresponds to utilities (heating, electricity), as some cantons allow these to be deducted differently.
• Anticipate the pro-rata: Precisely measure the surface area of the rented room compared to the total living space of your home to easily calculate the reduction in your rental value.

In conclusion, taxation should not be a barrier to your desire to welcome a tenant. The legal framework in Switzerland in 2026 is designed to be fair and to encourage the optimization of living space. At Roomlala, we are proud to offer you a secure platform that facilitates these human and financial exchanges. By correctly declaring your income and applying the deductions you are entitled to, you will make renting your room an experience that is as enriching on a personal level as it is financially.