What is the legal mobility budget?

The legal mobility budget is a sustainable and fiscally advantageous alternative to the company car.

Employees with (the right to) a company car may trade it in for a generous budget.

You calculate the budget based on the Total Cost of Ownership of the current company car.

Your employees can spend their mobility budget on environmentally friendly mobility options, divided over 3 pillars.

Thanks to its great flexibility, the mobility budget is Belgium’s most advantageous and flexible remuneration model.

Illustration of how to save on corporate mobility with the Olympus platform
Front page of the mobility guide on the Belgian mobility budget

Mobility Guide: The legal mobility budget in 2025

All essential information in a clear guide.
Download mobility guide

Spend the mobility budget on 3 pillars

  • Pillar 1

    Pillar 1

    Environmentally friendly company car
  • Pillar 2

    Pillar 2

    Sustainable mobility and housing costs
  • Pillar 3

    Pillar 3

    Cash

How does the mobility budget work?

Step 0. Calculate the mobility budget based on the Total Cost of Ownership.

The Total Cost of Ownership of the current company car determines your employee’s mobility budget.

This TCO includes, among other things …

  • The monthly lease or rental price of the company car
  • Fuel costs
  • Insurance
  • CO2 solidarity contribution
  • Non-deductible VAT
  • Corporation tax on non-deductible car costs

Step 1. Opt for an environmentally friendly company car in pillar 1.

In pillar 1, your employee has two choices:

  • Give up the company car entirely.
  • Pick an eco-friendly company car.

The TCO of a new eco-friendly car is lower than the current one. This is due to reduced CO2 emissions or a lower list price.

Your employee spends the remaining amount on pillar 2 of the mobility budget.

Step 2. Choose sustainable mobility and housing costs in pillar 2.

In pillar 2, your employee spends the budget on all kinds of sustainable means of transport.

Think train, tram, bus and shared cars, bikes and steps. A wide range of alternatives to their company car!

There is also the option of spending the budget on housing costs: rent and mortgage loans.

This option is only possible if your employee lives within a 10-kilometre radius of the main workplace or if your employee works at least 50% from home.

Step 3. Disburse the remaining budget at the end of the year in pillar 3.

On 31 December of each calendar year, we take stock of the mobility budget. At that time, the employee’s remaining amount is paid out in cash.

This is done after deducting a special employee contribution of 38.07%. It is not possible to carry over the budget to a subsequent year.

Olympus Mobility provides you as an employer with a report showing the balance to be paid out to your employee.

No need to calculate anything yourself.

The Olympus management portal and mobility app

Simplify management with the Olympus Mobility platform

  • Eliminate time-consuming budget management.
  • Integrate a single, fully digital platform
  • Choose which mobility options you activate for your employees.
  • Most financially advantageous option, for you and your employees.
  • Trusted by almost 900,000 users.

A calculation based on Total Cost of Ownership

A numerical example

Situation 1

Pillar 1

€800

Pillar 2

€200

Pillar 3

€0

Suppose your employee Bart has an annual budget of €12,000. Each month he receives €1,000.

On the first of July, Bart decides to trade in his company car. Until the end of the year, he has €6,000 at his disposal.

In situation 1, Bart opts for an environmentally friendly company car in pillar 1. The new TCO is only €800 per month.

He is free to spend the remaining €200 on sustainable mobility or housing costs in pillar 2.

Situation 2

Pillar 1

€0

Pillar 2

€800

Pillar 3

€200

If Bart only opts for pillar 2, he will have the full €1,000 per month available for alternative means of transport or housing costs.

Each month, he uses €800 of that amount, leaving €200 each time.

At the end of the year, Bart still has €2,400 available.

After deducting 38.07% special employee contribution on the remaining amount, you as an employer pay out €1,486.32 to Bart in pillar 3.

More on the mobility budget

Comment calculer le Total Cost of Ownership (TCO) du budget mobilité ? cover

How do I calculate the Total Cost of Ownership (TCO) for the mobility budget?

Determining the legal mobility budget is based on the Total Cost of Ownership. However, calculating the TCO is not a piece of cake.

To clarify the calculation, the Federal Government created two official TCO formulas.

This article sets out the details.

Read more
New TCO formulas: What do you need to know? Explanation by My Mobility Budget Butler

New TCO formulas: What do you need to know? Explanation by MMBB

Learn about the new TCO formulas and changes in the legal framework regarding the mobility budget.

Together with expert Thierry Devresse of MMBB, we discuss the essential information.

Download webinar
Foto over het wettelijk mobiliteitsbudget met Business & Decision

The legal mobility budget with Business & Decision: Challenges and solutions

The legal mobility budget feels like a complex affair for many companies. How does the implementation look like? How beneficial is it for employees?

We spoke to Business & Decision about the roll-out of the legal mobility budget and their experience with this tax advantageous framework.

Take a look