Built by Sami Elhamdaoui
Autofiscaliteit started as the practical half of my final-year project on the impact of car costs on disallowed expenses. What began as a calculation for a single office is now online, free, for every company in Belgium.
Who
Sami Elhamdaoui
Accounting Administration
Where it comes from
A final-year project
Academic year 2025-2026
What it costs
Nothing
No subscription, no limits
The story behind it
At the accountancy firm where I put my training into practice, the same question kept coming back: which car should we actually buy or lease? A large part of the country's company fleets comes up for renewal between 2026 and 2028, exactly when the tax rules change fundamentally.
From 2026, the corporate tax deductibility of new combustion cars drops to zero, while electric cars ordered before 2027 keep their full deduction. At the same time the CO₂ solidarity contribution and the minimum director's salary for the reduced SME rate both rise. The real cost of a company car has become a calculation with a lot of moving parts, one where guessing easily costs you thousands.
For my final-year project I turned that calculation into a tool: the formulas from the legislation, the deduction calendar, the benefit in kind, the disallowed expenses and the social security contribution, brought together into one calculation with a reasoned recommendation.
Why it is free
The figures this tool works with are public: they are in the law, in circulars and in the social security instructions. What was missing was not the information, but the patience to put it together correctly.
A small business rarely has an adviser for this, and often ends up paying the most as a result. That is why Autofiscaliteit is free, with no limit on the number of vehicles and no paid tier. If you find it useful, feel free to pass it on.
What the tool does
- Vehicle catalogue: the most common company cars, with an instant tax preview.
- My vehicles: your own fleet and candidates, with the full calculation of deduction, benefit in kind, disallowed expenses and social security.
- Comparison: a scoring matrix with six weighted criteria and a recommendation per candidate.
- Tax framework: the rules behind the calculation, in plain language.
Contact and responsible publisher
Autofiscaliteit is published by Sami Elhamdaoui, Belgium. A question, a mistake in the calculation or a suggestion? Send a message to contact@autofiscaliteit.com.
How your data is handled is set out in the privacy policy; the rules around use are in the terms of use.