Personal income tax return in Belgium: complete guide for landlords
Complete guide to the personal income tax return for Belgian landlords. Section III, immovable income, codes, deadlines, and common mistakes.
- 01 Section III
- 02 Codes to use
- 03 Steps in Tax-on-web
- 04 Common mistakes
Section III of the personal income tax return
Property income is declared in Section III (Income from immovable property) of the personal income tax return. This section includes:
| Part | Content | Codes |
|---|---|---|
| A. Non-rented properties | Second home, vacant property | 1106 |
| B. Properties rented to an individual | Non-indexed RC | 1106 |
| C. Properties rented to a company/professional | Gross rent | 1109 |
| D. Properties abroad | Rental value or actual rent | 1130 |
The primary residence is exempt and does not appear in Section III.
For the rental income tax return, consult our introductory guide. For personal income tax and rental income, consult our detailed guide.
You do not need to calculate the indexation or the 40% increase. Simply enter the non-indexed RC — Tax-on-web calculates everything automatically. Check the result in the simulation before submitting.
Codes to use
Property rented to an individual — code 1106
Enter the non-indexed RC of the property. The tax authorities automatically calculate:
- Indexation (x annual coefficient)
- The 40% increase
- The deduction of mortgage interest (code 1146)
Property rented to a company — code 1109
Enter the annual gross rent + any benefits. The flat-rate charge deduction (capped 40%) or actual costs are deducted automatically or manually.
Property abroad — code 1130
Enter the gross rental value or the actual rent (depending on the country). A 40% flat rate is deductible. Foreign income is often exempt in Belgium (double taxation agreement) but with progressivity reserve (it increases the marginal rate on other income).
Mortgage interest — code 1146
Enter the amount of mortgage interest paid during the year (form 281.61 from the bank). Interest is deducted from gross property income.
Steps in Tax-on-web
1. Login
Log in to Tax-on-web via:
- itsme (mobile app)
- Electronic identity card (card reader)
- Personal code (sent by FPS Finance)
2. Section III — Property income
| Step | Action |
|---|---|
| A. Belgian properties not rented | RC of each non-rented property / second home |
| B. Properties rented to an individual | RC of each rented property |
| C. Properties rented to a company | Gross rent of each property |
| D. Mortgage interest | Total interest amount (form 281.61) |
3. Simulation
Tax-on-web offers a simulation before submission. Check:
- The property income amount
- The interest deduction
- The impact on overall tax
4. Submission
Submit the return. You receive a confirmation by email. The tax assessment notice arrives within 3-6 months.
Deadlines
| Method | Deadline |
|---|---|
| Paper form | 30 June |
| Tax-on-web (individual) | Mid-July |
| Tax-on-web (accountant/agent) | Mid-October |
A rental management software generates an annual summary with the amounts to declare.
Common mistakes
| Mistake | Consequence | Solution |
|---|---|---|
| Declaring the indexed RC instead of non-indexed | Double taxation | Check on the tax assessment notice |
| Forgetting to declare a vacant property | Reassessment + surcharges | Declare all properties under code 1106 |
| Confusing code 1106 and 1109 | Incorrect taxation | Check the type of tenant |
| Not declaring foreign properties | Reassessment + penalties | Code 1130 |
| Forgetting mortgage interest | Too much tax paid | Code 1146 + form 281.61 |
Reassessment period
FPS Finance has:
- 3 years for a normal reassessment
- 7 years in case of fraud or failure to declare
For a landlord with 1-2 properties rented to individuals, the return is simple: RC at code 1106 + interest at code 1146. For complex situations, an accountant is a worthwhile investment (fees 200-500 EUR vs reassessment risk).
To create a compliant lease, use our online lease generator. For complete rental taxation, consult our guide.
Frequently asked questions
-
The return must be filed each year, generally between May and July (exact deadline set by FPS Finance). Via Tax-on-web, the deadline is longer (until mid-October). The income declared is from the previous calendar year.
-
Yes. Any property (other than the primary residence) must be declared, even if vacant. The cadastral income is entered under code 1106 (as for a property rented to an individual). The absence of a tenant does not exempt from the declaration.
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For an owner with 1-2 properties rented to individuals, the return is simple and can be done via Tax-on-web. For complex situations (company tenants, properties abroad, usufruct), an accountant is recommended.