# Common mistakes in mileage reimbursement

> Avoid the most common mistakes that can delay or invalidate your mileage reimbursement request.

**Author:** Camila Ribeiro — Field Operations Editor  
**Published:** 2025-10-03  
**Updated:** 2025-10-03  
**URL:** https://quilometragem.com/blog/common-mistakes-in-mileage-reimbursement

**TL;DR:** Avoid the most common mistakes that can delay or invalidate your mileage reimbursement request.

- Avoid the most common mistakes that can delay or invalidate your mileage reimbursement request.
- One of the most common mistakes is not documenting trips immediately.
- Waiting weeks or months to record mileage leads to inaccurate estimates and failed memory about important details.
- Another frequent error is mixing personal trips with business ones.

One of the most common mistakes is not documenting trips immediately. Waiting weeks or months to record mileage leads to inaccurate estimates and failed memory about important details.

Another frequent error is mixing personal trips with business ones.[^rfb-substantiation] It's crucial to clearly separate personal vehicle use from work trips to avoid tax and compliance issues.

Many employees also err by not including all necessary information in receipts, such as trip purpose, name of client visited, or related project. This data is essential for approval and audit.

Manually calculating distance without using precise tools is another common problem. Systems like Quilometragem use professional mapping APIs to ensure exact calculations.

Finally, not following the company's reimbursement policy can result in rejections. Always check the rules before requesting reimbursement and use tools that apply these policies automatically.

## Frequently asked questions

### What is the most common mileage reimbursement error?

The most frequent mistake is logging the trip days later without accurate data, missing the route or business purpose — invalidating the expense in an audit.

### How to avoid forgetting to log trips?

Enable the app's automatic mode: it detects trip start via GPS and sends a notification to confirm purpose at the end, without relying on memory.

### What happens if I mix personal and business trips?

In an audit, the tax authority can disallow the entire month if there is no clear separation. Best practice is to classify each trip immediately after it ends.

## Sources

- [Receita Federal — Despesas dedutíveis com veículos](https://www.gov.br/receitafederal/pt-br) — Receita Federal do Brasil (2026-04-28)