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

Faced with the housing shortage affecting many Swiss cities, hosting a tenant in your home has become an essential solution. At Roomlala, we see every day how this practice creates social bonds while providing a significant source of additional income. However, when it comes to 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 demonstrate tax transparency.

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

Read also: Student housing in Flanders: What you need to know about student leases for the 2026 academic year, Fall 2026 in Italy: The advantages of the Canone Concordato for renting out your room and Regulation of short-term rentals: What changes for students in Spain for the 2026 academic year

Understanding the legal and tax framework for homestays in 2026

Welcoming a student or a young professional into an unused room in your house or apartment is not only an act of solidarity, but also an activity governed by law. The room rental legislation in Switzerland is very clear on this: any income generated by the rental of a property, even partial, constitutes taxable income. At Roomlala, we make it a point of honor to support you in understanding these rules to ensure a smooth experience.

In Switzerland, the basic principle of housing taxation is based on contributory capacity. If you receive rent every month, it increases your total 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 the authorized deductions often make the operation very advantageous.

It is also important to remember that renting a furnished room as a homestay benefits from great contractual flexibility. You remain in control of your home. However, from a tax perspective, 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 frequent use case on our platform: you decide to rent a 15 m² room to a student at the University of Lausanne for 800 CHF per month, including utilities. Over a full year, this represents a gross income of 9,600 CHF. This is the exact amount that must appear in the section dedicated to real estate income in your 2026 tax return.

The 2026 rental income tax return: an obligation of transparency

Filling out your tax return can sometimes seem tedious, but cantonal forms have been greatly simplified in recent years. The 2026 rental income tax return is generally completed in the section reserved for real estate investment returns. You must indicate the total amount of rent received during the past calendar year.

It is crucial to differentiate net rent from utilities (water, electricity, internet). If you rent "all inclusive," 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 costs from the 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 inquiries from cantonal tax authorities.

Finally, do not forget that this reporting obligation applies from the first franc earned. There is no "tolerance threshold" or exemption for small amounts in Switzerland. Rigor is required, but as we will see, it comes with very attractive deduction rights.

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, this is a fictitious income that owners occupying their own home must add to their taxable income. The idea is to create tax 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 special attention to avoid any tax injustice. In 2026, adjustment rules are of capital importance for Roomlala hosts.

The reform calendar: no panic before 2029

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

Therefore, you must 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 until the end of 2028 inclusive, all benefits related to deductions (especially interest on your mortgage debt) are fully maintained. This is therefore the ideal time to optimize your taxes while hosting a tenant.

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

Avoiding double taxation: the pro-rata adjustment

This is the question all owners ask 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 double tax on that 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 proportionally 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 (i.e., 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 appendix to justify this calculation, while others include a dedicated box in their tax return software. Inquire with your local tax office to find out the exact procedure to follow.

Authorized tax deductions: optimize your 2026 return

If renting a room generates taxable income, it also gives you the right to significant tax deductions. The Federal Tax Administration recognizes that maintaining a property in a rentable state incurs costs. In 2026, these deductions remain a powerful lever to reduce 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 expenses or the application of a flat-rate deduction.

Maintenance costs: actual or flat rate?

As a landlord, even for a single 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 expenses will be much more advantageous. Work considered deductible includes value-maintenance work (painting, window replacement, plumbing repairs). Value-adding work (adding a luxury bathroom that did not exist) is generally not deductible.

Example use case: Before putting your room on Roomlala, you hired a professional 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 to which you are entitled, it is in your best interest to opt for the deduction of actual expenses that year, by attaching the invoices to your declaration.

We recommend that you perform a simulation every year. The choice between actual expenses and the flat rate is not final; 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 December 31, 2028. This is a crucial piece of data 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 a room turns out to be minimal compared to the net financial benefit you derive from it.

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

Cantonal specificities and best practices for renting with peace of mind

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 exact percentages for 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 assessment scales. It is therefore essential to insist on these cantonal specificities: what is true in Lausanne is not necessarily true to the exact franc in Winterthur.

To rent with 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 website to download the 2026 explanatory notice 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 the utilities: If possible, clearly state in your communications the part of the rent that corresponds to utilities (heating, electricity), as some cantons allow them to be deducted differently.
• Anticipate the pro-rata: Precisely measure the surface area of the rented room compared to the total living area of your home to easily calculate the reduction in your rental value.

In conclusion, taxation should not be a barrier to your desire to host 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 to which you are entitled, you will make renting out your room an experience as enriching on a personal level as it is financially.