Taxation

Rental income tax declaration: a simplified guide for landlords

10 June 2026 ยท 6 min read
FR NL EN

Declaring rental income frightens many landlords. Between tax regimes, deductible charges and forms to fill in, it's easy to get lost. Yet with good organisation throughout the year, it's a formality that takes less than an hour.

Here's the essential information by country of residence.

๐Ÿ‡ง๐Ÿ‡ช Belgium

Indexed cadastral income โ€” in Belgium, private landlords are not taxed on the actual rent received, but on the indexed cadastral income increased by 40%. This is often much lower than the actual rent.

Exception: if you rent to a company or legal entity, the actual rent is taxable.

To declare: box III of the personal income tax return (property income).

๐Ÿ‡ซ๐Ÿ‡ท France

Micro-foncier regime โ€” if your gross annual rental income is below โ‚ฌ15,000, you automatically benefit from a flat-rate allowance of 30%.

Actual regime โ€” if your charges exceed 30% of the rent (loan interest, works, insurance), the actual regime is more advantageous.

๐Ÿ‡จ๐Ÿ‡ญ Switzerland

Rental value โ€” in Switzerland, even owner-occupiers are taxed on a notional rental value. For landlords, the actual rent received is taxable as income.

Deductible charges: maintenance costs, mortgage interest, administration fees.

Generally deductible charges

Tip

Keep all your invoices and receipts throughout the year. In the event of a tax audit, you must be able to prove each charge deducted. A digital file per property is ideal.

How to prepare your return stress-free

The key is not to do everything in April. If you record your payments month by month in a dedicated tool, your return comes down to exporting the annual summary and transferring the figures.

Domavix generates a complete Excel export of all your collections by property and by year โ€” exactly what you need to complete your return in minutes.

Keep track of every rent payment, all year long

Annual Excel export included from the Starter plan. Your return in a few clicks.

Start for free โ†’