The expense report is rarely hard. It is just delayed, and delay is what makes it painful. By the time Friday arrives, receipts have vanished and the reason for a charge is a blur. The fix is to move the work into the trip itself.
Capture as you go. Photograph each receipt the moment you get it and add a one-line note about who or what it was for. Most expense tools let you forward a confirmation email straight into a draft report. Thirty seconds in the moment saves thirty minutes of reconstruction later.
Set a standing rule for yourself: no receipt survives the day unlogged. When the trip ends, the report is already most of the way done, and finance stops chasing you for context you no longer remember.