Rental yield calculation: complete method for Belgium
Complete guide to calculating gross and net rental yield in Belgium. Formulas, worked examples, common mistakes and Belgian tax specificities.
- 01 The 3 formulas
- 02 Worked example
- 03 Belgium-specific costs
- 04 Common mistakes
- 05 Summary
The 3 levels of rental yield
Too many investors rely solely on gross yield to evaluate a property. In Belgium, this approach is particularly misleading because acquisition costs and taxation vary significantly between regions. Here are the three formulas you need to master.
Gross yield
Gross yield = (annual rent / purchase price) x 100
Net yield
Net yield = ((annual rent - annual charges) / total acquisition cost) x 100
Net-net yield (after tax)
Net-net yield = ((annual rent - charges - tax) / total acquisition cost) x 100
In Belgium, residential rental income is not taxed on the actual rent received but on the indexed cadastral income increased by 40%. This system is generally favourable to the landlord-investor.
Worked example: flat in Liege
Let us take a concrete case: a 2-bedroom flat in Liege.
| Item | Amount |
|---|---|
| Purchase price | 180,000 EUR |
| Registration fees (12.5%) | 22,500 EUR |
| Notary fees (~2.5%) | 4,500 EUR |
| Total acquisition cost | 207,000 EUR |
| Monthly rent | 750 EUR |
| Annual rent | 9,000 EUR |
Annual charges:
| Charge | Amount |
|---|---|
| Property tax | 1,400 EUR |
| Co-ownership charges (owner’s share) | 1,200 EUR |
| Landlord insurance | 250 EUR |
| Maintenance (1% of price) | 1,800 EUR |
| Vacancy provision (1 month/3 years) | 250 EUR |
| Total charges | 4,900 EUR |
Results:
- Gross yield: 9,000 / 180,000 x 100 = 5.0%
- Net yield: (9,000 - 4,900) / 207,000 x 100 = 1.98%
- Net-net yield: approximately 1.7% (after taxation of cadastral income)
The gap between gross and net-net reaches more than 3 points here. That is the reality of the Belgian market. A well-drafted lease agreement with clear charge clauses helps minimise unexpected costs.
Belgium-specific costs
Registration fees by region
| Region | Standard rate | Reduced rate | Condition |
|---|---|---|---|
| Wallonia | 12.5% | 6% | Modest dwelling (< CI 745 EUR) |
| Brussels | 12.5% | 0% (abatement) | First acquisition < 600,000 EUR |
| Flanders | 12% | 3% | Sole residence |
The Flemish reduced rate of 3% for sole residences radically changes the calculation: the acquisition cost drops by 15 to 20%, improving net yield by close to a full percentage point.
Property tax
Property tax varies by municipality. In Wallonia, it represents on average 40 to 50% of the non-indexed cadastral income. In Brussels, the rate is slightly lower. In Flanders, municipalities apply variable surcharges.
Property tax is not a deductible charge against property income in Belgium. It is added on top of the tax on cadastral income. Many investors forget this in their simulations.
EPC and impact on yield
A property with a poor EPC rating (E, F or G) rents for 10 to 15% less than a property rated A or B. In Brussels, the 2026 lease reform limits the rental deposit to 2 months for energy-inefficient properties.
The 5 most common calculation mistakes
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Forgetting acquisition costs: dividing by the purchase price alone instead of the total cost artificially inflates the yield by 1 to 2 points.
-
Ignoring vacancy: even in a tight market, budget for 1 month of vacancy every 2-3 years. In Charleroi, plan for 1 month per year.
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Underestimating maintenance: the rule of 1% of the purchase price per year is a minimum. For an older property, budget 1.5 to 2%.
-
Confusing tenant and landlord charges: co-ownership charges are split between the landlord (reserve fund, major works) and the tenant (common charges). A clear lease avoids disputes.
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Ignoring taxation: the net-net yield is the only reliable indicator for comparing two investments. The legal structure chosen directly impacts this yield.
Summary: calculate correctly to invest correctly
Rental yield is the first filter for any property investment, but it must be calculated correctly to be meaningful. In Belgium, regional specificities (registration fees, property tax, EPC) create significant differences.
The golden rules:
- Always calculate based on the total acquisition cost, fees included
- Deduct all actual charges, including the vacancy provision
- Factor in Belgian taxation (cadastral income, property tax)
- Compare net-net yields, never gross
To refine your analysis by city, see our yield ranking by city for 2026 and our comparison Flanders vs Wallonia vs Brussels.
The formulas presented incorporate Belgian tax specificities per region (registration fees, property tax, taxation of rental income). Examples use average Statbel Q3 2025 prices and average Immoweb rents. The net-net yield includes tax on the indexed cadastral income.
Frequently asked questions
-
Gross yield = (annual rent / purchase price) x 100. For example, for a rent of 800 EUR/month and a price of 200,000 EUR: (9,600 / 200,000) x 100 = 4.8%. This formula does not account for acquisition costs or charges.
-
Net yield deducts all charges (property tax, co-ownership fees, maintenance, insurance) from the annual rent and divides by the total acquisition cost (price + notary fees + registration fees). The gap is typically 1 to 1.5 points.
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Yes. For a realistic calculation, divide net rent by the total acquisition cost including registration fees (12.5% in Wallonia and Brussels, 3% in Flanders for sole residence) and notary fees (2 to 3%).
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A gross yield of 4% or more is considered decent. A net yield above 3% is good. Below 2.5% net, the investment is only worthwhile if capital gains on resale compensate.
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