Effective date: 1 July 2025
The Walloon Parliament has definitively adopted a major reform of the registration tax (TMC). From 1 July 2025, this tax, paid at registration, will use a new calculation that takes into account:
- Base Amount (BA) after degressive reduction (vehicle age)
- Engine power (in kW)
- CO₂ emissions (g/km)
- Maximum authorised mass (kg) - MAM
- Energy/fuel type (combustion, hybrid, electric)
📊 How is the TMC calculated?
The formula is as follows:
TMC = BA × (CO₂ ÷ X) × (MAM ÷ Y) × C
- BA = Base Amount after degressive reduction (vehicle age)
- CO2 = CO2 emissions
- X = CO2 coefficient
- MAM = Maximum Authorised Mass
- Y = Mass coefficient
- C = Energy/fuel coefficient
The formula explained:
BA: base amount based on kW, reduced according to age
CO₂/X: emissions divided by a figure depending on WLTP/NEDC (1 for electric)
MAM/Y: effect of the vehicle’s weight
C: coefficient depending on the fuel (electric, hybrid…)
Range: between €50 and €9,000
Reductions: -€250 for large families, from 2026 -€250 for single-parent families
⚠️ Practical impact: Tesla Model 3
Under the old system, the TMC on an electric car such as the Tesla Model 3 was €61.50. With the reform, the TMC soars to around €1,100, or even up to €1,588 according to some simulations.
A spectacular difference.
🔍 Who will be hit hardest?
- Heavy, powerful electric cars: taxed much more than before (Tesla, electric SUVs)
- Hybrids and combustion-engine cars: less impact, except for powerful, heavy models
- Small electric cars: still favoured, sometimes taxed at the minimum
💡 Why this change?
The Walloon government wants to:
- Encourage lighter, less polluting vehicles
- Take into account the impact on roads and the environment
- Make taxation fairer by penalising heavier vehicles
✅ How can you prepare?
Before buying: use a simulator to estimate your TMC in 2025-2026
- Choose carefully: favour light electric cars or efficient hybrids
- Make use of the reductions: check whether your car falls into the large family or single-parent family category
- Consider a used car: the TMC decreases with the vehicle’s age (degressive coefficients)
🧩 In short:
Old system | New system (from July 2025) |
Tax based on power (kW) | Full calculation: power, CO₂, weight, fuel |
Minimum TMC: €61.50 | Range: €50 → €9,000 |
Electric vehicles strongly favoured | Heavy electric vehicles heavily taxed |
🔎 Before you buy or register, plan ahead: your vehicle could cost more than €1,000 in tax, especially electric models such as the Tesla Model 3. To avoid nasty surprises: calculate, compare, optimise!
You can also book an appointment directly with our team, online or at one of our branches: https://www.legarageprive.be/appointment/4?