Rental property is the only major asset class your bank will help you buy with its own money. That is what makes it so powerful for building passive income. It is also what makes it dangerous when the numbers are done badly. Here is how to calculate a real return in Belgium in 2026, with a method that works anywhere.
Why rental property
- Leverage: with a €40,000 down payment, you can control a €200,000 property. If the property gains 2% a year, that is €4,000 of capital gain, or 10% of your down payment.
- The tenant pays off the loan: at the end of the mortgage, you own a property paid for largely by the rent.
- A tangible income, usually indexed.
- An asset you can improve: renovating, splitting or changing its use increases its value, which is impossible with a share.
Purchase costs in Belgium in 2026
For an investment property, registration duties are much higher than for your own sole home:
| Region | Own sole home | Investment property |
|---|---|---|
| Wallonia | 3% | 12.5% |
| Brussels | 12.5%, with a €200,000 allowance (price up to €600,000) | 12.5%, no allowance |
| Flanders | 2% | 12% |
On top of this come the notary's fees, deed costs and, if you borrow, mortgage registration costs. Allow about 14 to 16% of the price in total for an investment in Wallonia or Brussels. These costs generally have to be covered by your down payment.
Many investors start by buying their own home at the reduced rate, then rent it out a few years later when they buy a new home. Check the conditions for keeping the reduced rate with your notary before doing so.
Calculating the real return
The yield shown in listings is almost always the gross yield: annual rent divided by price. It means very little. Calculate the net yield:
Example: a two-bedroom flat in Wallonia
| Purchase price | €180,000 |
| Purchase costs (about 15%) | €27,000 |
| Minor refurbishment | €8,000 |
| Total cost | €215,000 |
| Rent: €850 × 12 | €10,200 |
| Vacancy (one month in twelve) | −€850 |
| Property tax | −€900 |
| Insurance, maintenance, provision for major works | −€1,200 |
| Non-recoverable charges | −€300 |
| Net income before loan and income tax | €6,950 |
| Net yield (6,950 / 215,000) | 3.2% |
The advertised gross yield would have been 5.7% (10,200 / 180,000). The gap is huge, and that is normal.
Then calculate the monthly cash flow: net income minus the mortgage payment. Negative cash flow means you pay every month to own the property. That is not necessarily bad if the expected capital gain justifies it, but it is not passive income.
Calculate your project's net yield
Replace the example's values with those of the property you are targeting.
Types of letting
| Type | Yield | Work | Points to watch |
|---|---|---|---|
| Standard letting (3- or 9-year lease) | Moderate | Low | Stable, but rents limited by indexation |
| Flat-share | Higher | Medium | Permits and local standards, tenant turnover |
| Student rooms (kot) | High | Medium | Seasonality, university towns |
| Short-term rental (Airbnb-style) | Potentially high | High | Strict regional and local rules, different taxation, daily management |
| Splitting a house into several units | High | High at first | Planning permission essential |
Taxation of rental income
In Belgium, an individual letting a home to another individual who lives there is not taxed on the actual rent, but on the indexed cadastral income plus 40%. This is often advantageous. Interest on the loan for the rented property is in principle deductible from property income.
If you let to a company or for business use, the regime changes: you are taxed on the actual rent, minus a flat-rate cost deduction. For furnished or short-term lets, part of the rent may be taxed differently: ask an accountant.
In Europe and around the world
Belgian purchase costs for investors are among the highest in Europe. For comparison: in the Netherlands, transfer tax on an investment home is 8% in 2026 (down from 10.4% in 2025); in France, ‘notary fees’ on existing property amount to about 7 to 9% of the price; in Germany, property transfer tax ranges from 3.5 to 6.5% depending on the state, plus the notary; in the UK, stamp duty includes a surcharge for additional homes. But the method does not change: everywhere, compare net yields, after costs, vacancy, charges and taxes.
The most common traps
- Buying on a crush rather than for a return.
- Underestimating works, especially energy-related ones: energy performance requirements for rented homes are tightening in all three regions.
- Forgetting vacancy and unpaid rent.
- Neglecting permits: a flat-share or a split without a permit can be very costly.
- Choosing an area with no rental demand.
Going further
Communities such as Le Club or seminars such as The Mind let you talk to investors active in Belgium. If you prefer a more active strategy, read buy to resell.
Where to find these services
- ImmowebBelgium's main property portal
- ZimmoProperty portal
- ImmovlanProperty portal
- Notaire.be / Notaris.beBelgian notaries' purchase cost calculators and practical guides
Links provided for information, with no partnership. Always check a provider's terms and authorisation before committing.
Test yourself
4 questions to check what you remember. Click an answer: the explanation appears straight away.
Question 1 of 4Which yield should you use to compare two properties?
In the example, a 5.7% gross yield becomes a 3.2% net yield.
Question 2 of 4What are registration duties on an investment property in Wallonia in 2026?
The 3% rate is reserved for your own sole home.
Question 3 of 4How is a Belgian individual letting a home to another individual taxed?
This regime is often advantageous compared with the actual rent.
Question 4 of 4What is the main risk of a flat-share or split without a permit?
Planning rules and local standards must be checked before buying.
Frequently asked questions
What yield should you aim for with a rental investment in Belgium?
Think in net yield, after purchase costs, vacancy, property tax, maintenance and insurance. A gross yield of 5 to 6% often gives a net of 3 to 4%. More active strategies (flat-shares, student rooms, splitting) can aim higher, with more work and risk.
What registration duties apply to a rental investment in Belgium?
In 2026, 12.5% in Wallonia and Brussels, 12% in Flanders for a property that is not your own sole home. Add notary and mortgage costs: about 14 to 16% in total.
How is rental income taxed in Belgium?
For a home let to an individual who lives there, tax is calculated on the indexed cadastral income plus 40%, not on the actual rent. Letting to a company or for business use is taxed on the actual rent minus a flat-rate cost deduction.
Do you need a down payment to buy a rental property?
In practice, yes: banks rarely finance more than 80 to 90% of the price of an investment property, and purchase costs generally have to be covered by the down payment.
Sources
This article is educational and is not personal investment, tax or legal advice. Figures change: check them with the sources cited or a licensed professional before deciding. Read the full disclaimer.