Audit logs mobility expenses: what are they and why are they essential for Belgian HR teams?
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Flexible pay and the mobility budget are here to stay in Belgian HR policy. But with that flexibility comes more admin. And one day, the social inspection, or the tax authorities, will show up to check your mobility expenses.
Can you prove, at that moment, who approved what, when, and based on which rule? That proof is called an audit trail for your mobility budget. Without it, you have nothing to show.
Why a generic Excel overview falls short
An audit trail is an unchangeable, chronological record of every action on your mobility expenses: who submitted a request, who approved it, when, and under which company rule. It is your evidence during a social or tax inspection. Not a summary, but the raw, unedited history.
Why a spreadsheet will not save you
Many HR teams still manage their mobility budget through spreadsheets or disconnected tools. That works, until it does not:
- Calculation errors. Manually working out CREG rates and TCO? Sooner or later, something goes wrong.
- No unchangeable history. In a spreadsheet, anyone can edit a number after the fact. During an inspection, that is a red flag for the inspector.
- No proof. Who approved this expense, at what time, and under which rule? If you cannot show that immediately, you are already on the back foot.
How Mbrella keeps your audit trail automatically
Mbrella centralizes your mobility administration, so you no longer have to figure out who did what, and when.
Clear status tracking. Easily track whether any request has been approved or rejected, backed by an unchangeable audit log.
Rules you set yourself. Configure company rules and user groups per job category. That way, every choice stays within your policy, and within the three legal pillars.
Proof documents in one place. Invoices, charging sessions, tickets: everything is automatically linked to the right transaction. No more scattered mailboxes or folders.
Straight to payroll. Approved and locked expenses flow automatically to your social secretary. What you approve is what ends up on the payslip. No manual corrections.
Comparison: Manual Spreadsheets vs. Mbrella
Conclusion
During an inspection, only one thing counts: can you prove it? An audit trail for your mobility budget is your safety net. Mbrella builds that safety net for you automatically, so you can face the next inspection with peace of mind, instead of staring at a spreadsheet.
Want to see what that looks like in practice? Book a demo and we will show you your own audit trail live.
FAQ: Audit logs in mobility software
What is the difference between an audit log and a report?
An audit log records every event exactly as it happened, with no room for anyone to tamper with it afterward. A report is a summary of that data.
Is an audit trail legally required in Belgium?
The law does not use that exact term, but it does require full traceability and evidence for your mobility budget. In practice, there is no way around it.
How long do you need to keep an audit trail?
Follow the same retention period as your other social and tax documents, in practice at least 5 years. Mbrella keeps your full history automatically, with no extra work on your end.
How does Mbrella help with compliance?
By automating tracking, validation, and reporting for your mobility budget. That way, you stay compliant without having to chase it yourself.