How Is the Cadastral Value Determined in Belgium

The Short Answer

Cadastral value is the official estimated value of your property for tax purposes.

In Belgium:

• It determines your property tax (précompte immobilier / onroerende voorheffing)
• It is NOT the market value of your property (usually lower)
• It also partly determines inheritance tax
• You can challenge it if you disagree

The cadastral value is determined by:

1. Base cadastral income (starting point)
2. Condition of the property (renovations, age)
3. Location (district, neighbourhood)
4. Market conditions (price trends)
5. Comparison with similar properties

This guide explains how it works, how to calculate it, and how to challenge it if needed.

1. What Exactly Is the Cadastral Value?

The Concept:

Cadastral value = Official estimate of your property's value for tax purposes.

This Is NOT:

• ❌ The sale price of your property
• ❌ The market value
• ❌ What an estate agent estimates
• ❌ The price a buyer would pay

This IS:

• ✅ The basis for property tax calculations
• ✅ The basis for inheritance tax calculations
• ✅ An official valuation
• ✅ Determined by the tax authorities

Example:

• Market value of your property: €400,000
• Cadastral value: €280,000 (typically 70% of market value)
• Used for: Tax calculations

You pay property tax on €280,000, not €400,000!

2. How Is the Cadastral Value Determined? - The Formula

The cadastral value is based on a standard formula with multiple factors.

Basic Formula:

Cadastral Value = Base Cadastral Income × Correction Factor

That is an oversimplification. In practice, it works like this:

Cadastral Value = (Base Price/m² × m² × Condition Factor) + Corrections

The Components:

1. Base Price per m² (Location)

This varies by region:

These prices are LOWER than market prices!

2. Surface Area (m²)

The size of your property:

• Only usable living space is counted
• Garages and cellars count for less
• Terraces are not always included

Example:

• Usable living area: 120 m²
• Garage: 20 m² (counted at 50%)
• Cadastral area: 120 + (20 × 0.5) = 130 m²

3. Condition Factor

This is the big variable!

Example:

• Base: €2,500/m² × 120 m² = €300,000
• Condition factor: 0.85 (fair condition)
• Cadastral Value = €300,000 × 0.85 = €255,000

4. Corrections and Adjustments

The tax authority may apply further corrections for:

• Energy certificate (EPC rating)
• Age of the property
• Number of rooms
• Parking spaces
• Market trends (price rises)

3. Practical Example - How to Calculate Your Cadastral Value

Scenario: Apartment in Brussels

Given Data:

• Location: Brussels, Molenbeek-Saint-Jean
• Size: 100 m² (living space) + 10 m² balcony
• Year of construction: 1985
• Condition: Well maintained
• EPC rating: D (mediocre)

Step-by-Step Calculation:

Step 1: Determine the Base Price/m² (Location)

• Molenbeek-Saint-Jean: €2,800/m² (Brussels outskirts)

Step 2: Determine the Usable Surface Area

• Living space: 100 m²
• Balcony: 10 m² (counted at 25%): 2.5 m²
• Total: 102.5 m²

Step 3: Determine the Condition Factor

• Well maintained: Factor 1.0
• Year of construction 1985: Factor 0.95 (age)
• Combined: 0.95

Step 4: Calculate the Base Cadastral Value

• €2,800 × 102.5 m² × 0.95 = €274,300

Step 5: EPC Correction

• Rating D (mediocre): -5% reduction
• €274,300 × 0.95 = €260,585

Step 6: Market Correction

• Regional increase 2024: +2%
• €260,585 × 1.02 = €265,797

FINAL CADASTRAL VALUE: ±€265,800

4. Which Factors Influence the Cadastral Value Most?

High-Impact Factors:

1. LOCATION (±40% impact)

This is the BIGGEST factor!

An identical property in Brussels can be worth 3 times more than in a rural area!

2. CONDITION (±25% impact)

This can make a 20-50% difference:

• Excellent condition: +15%
• Good condition: Base (0%)
• Renovation needed: -20%
• Very dilapidated: -40%

Tip: If your property is in poor condition, renovate it! The cadastral value can rise significantly.

3. SIZE (±20% impact)

More surface area = higher cadastral value:

• Every extra 10 m²: +€2,000-€3,000 (on average)
• But: larger properties can have a lower cadastral value per m²

4. EPC RATING (±10% impact)

• Rating A: +10%
• Rating B-C: Base
• Rating D-E: -5% to -10%
• Rating F: -15% to -20%

Improving your EPC rating can raise your cadastral value!

5. AGE (±5% impact)

• New build: +5% to +10%
• 0-30 years: Base
• 30-60 years: -5% to -10%
• >60 years: -10% to -15%

5. Cadastral Value vs. Market Value - What Is the Difference?

This is CRUCIAL to understand!

Example:

The Cadastral Value Is Much Lower! (±70% of market value)

Why?

Reasons Why the Cadastral Value Is Lower:

1. Conservative estimate (the tax authorities take a cautious approach)
2. Based on cadastral income (often outdated)
3. Not all renovations are factored in
4. The market rises faster than cadastral indexations

6. How to Check Your Cadastral Value

Where to Find It:

In Belgium:

• Flanders: Fiscaal.vlaanderen.be
• Brussels: Finances.brussels.be
• Wallonia: Regional tax service

Steps:

1. Go to the tax authority's website
2. Log in with your tax number (national register number)
3. Search for