Portugal's digital itinerary slip: what the AT accepts

Inês Pereira — Portuguese Tax Specialist (AT)

Published: 4/12/2026 • Last reviewed: 4/28/2026 • 5 min read

Paper is gone. How to keep digital itinerary slips that survive an AT audit.

Summary

Portugal's AT accepts digital itinerary slips with worker and vehicle identification, trip data, SHA-256 hash and 10-year retention.[^rgpd-73] Watch out for untraceable edits and indiscriminate auto-approval.

Read next

Portugal's AT and the monthly mileage declaration for companies in 2026 — Portugal's AT introduced a monthly reporting obligation in 2026 for reimbursements above €5,000. The guide.

Portugal's €0.40/km limit: what the AT accepts in 2026 — Practical summary of Portugal's tax-free per-km limit for own-vehicle reimbursement in 2026, with examples.

IRS or IRC? Deducting mileage in Portugal by tax regime — Self-employed vs company: each case has its own rules. Practical guide.

How to generate a Portuguese receipt in 60 seconds — Step-by-step tutorial to issue an AT-accepted itinerary slip in Portugal.

Portugal's €0.40/km limit and the annual cap: what changes on the IRS return — How Portugal's €0.40/km limit and annual cap work — and how they affect the IRS return for people who use a personal vehicle for work.

Paper trip log or GPS app in Portugal: what AT accepts in 2026 — Portugal's AT modernized mileage proof requirements. A side-by-side comparison of paper logs and GPS apps.