We have already mentioned the significant increase in the kilometer tax in Flanders on July 1 as a result of the addition of a CO2 component to the current rates. Users of heavy trucks will have to enter the CO₂ emission class of their vehicle as a new parameter before July 1, 2026.
In rare cases, the CO₂ emission class is already stated on the vehicle documents. The vast majority of diesel trucks (from Euro 0 to Euro 6) fall into class 1, but some models with particularly low consumption may fall into class 2 or even class 3, which gives them a slight reduction in the CO₂ component of the tariff.
At the moment, it is not yet easy even for manufacturers to provide reliable information about the CO₂ class of each vehicle, as Kees Oostveen (Product Marketing Manager at Iveco Belgium) explains: “For the tax year 2026, the limit values have not yet been definitively determined due to the adjustment of the CO2 emission reduction from 30 to 43%. The decision on this will probably only be made by Europe at the end of March. Only when we know this decision and how Flanders will implement it, we can calculate whether an individual vehicle belongs to class 1, 2 or 3.”
Only when these values are known can manufacturers communicate clearly about them. The good news is that Viapass will assist users: in April, the interregional entity in charge of managing the kilometer charge in Belgium will make a CO₂ emission class calculator available on its website Viapass.be. This tool allows users to determine the CO₂ emission class based on the vehicle documents. The parameters taken into account include engine type, date of first registration, vehicle type and subgroup. The documents required to use the calculator are the vehicle registration certificate, the Customer Information File (CIF) and the Certificate of Conformity (CoC).
Through this calculator, Viapass will provide a document with the information entered by the user and the CO₂ emission class obtained. This document can be passed to the service provider to update the parameters of the OBU.
