What documentation is required to justify a travel-related expense?

The requirement for documentation to justify a travel-related expense is grounded in the need for accountability and transparency in financial matters. Copies of itineraries and boarding passes serve as essential proof that the travel occurred as planned, directly linking the expenses to what was agreed upon in terms of travel arrangements. These documents provide verifiable details, such as travel dates and destinations, which are crucial for financial audits and compliance with organizational policies.

Using only a receipt from the hotel fails to capture the entirety of the travel experience and may leave gaps in understanding the full scope of the trip. Similarly, a letter from the supervisor or verbal confirmation lacks the necessary specificity and verifiability that documents like itineraries and boarding passes provide. Overall, having complete documentation helps ensure that travel expenses are justified and aligns with established reimbursement policies, thus minimizing potential disputes or misunderstandings regarding approved expenses.