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A handy guide with all the changes for 2021

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2021 will be another year full of changes in car taxation, mainly due to the introduction of the WLTP as a basis for calculation. This has consequences for all fiscal elements that are based on the CO2 emissions of a car, such as the BIV/TMC (vehicle registration tax) and road tax in Flanders, but also the tax deductibility, benefit in kind and solidarity contribution.

Athlon has created a practical guide (available in Dutch and in French) to help you quickly get up to speed with the latest tax updates. In this guide, we also take a look at what is coming up in the near future.

Because you have to make decisions today about vehicles that will remain in your fleet for 3 to 5 years, you need to have a good view of the developments on the horizon.

What you need to know, and why

Today, plug-in hybrids are almost all more than 95% tax deductible. It is unknown whether this will still be the case in 2022 or 2023. In the medium term probably not, because the current government is aiming at all company cars being CO2 neutral by 2026.

The choice between diesel, petrol, mild hybrid, full hybrid, plug-in hybrid, CNG or 100% electric can have far-reaching tax consequences. As your trusted partner, Athlon helps you make a choice that will strike the right economic and ecological balance.

Higher CO2, higher taxes

Until recently, it was the NEDC 2.0 that was used as the basis for calculating tax formulas in Belgium. On 1 January 2021, this was replaced by the WLTP. This is coupled with higher CO2 figures and as a result higher taxes.

However, there are some nuances. To start with, the BIV/TMC and road tax on leased vehicles are still calculated based on power and fiscal horsepower. So nothing will change for these vehicles in that area. In addition, the various federal government agencies have decided to leave it up to the owner of the vehicle – for now at least – to choose between the NEDC 2.0 and the WLTP value for the calculation of tax deductibility, benefit in kind and solidarity contribution.

The only condition is that the manufacturer states both CO2 values on the certificate of conformity. For plug-in hybrids, this is in any case mandatory until the end of 2022. For cars registered before 1 January 2021, everything stays the same anyway, with the NEDC value remaining applicable here. 

For full information on all the tax changes, we invite you to download our free tax guide ( in French)  .
Download our guide (French)

Do you have additional questions? Then contact your trusted account manager or our tax specialists via


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