Everyone hates filling out expense reports about as much as they love spending money that is not theirs. How much of that money should you really spend though? Jennifer Winter provides some guidance in an article for the Muse.
If you are traveling for work, others are probably traveling with you. Watch to see how your more seasoned colleagues spend and follow suit. In any case, ask for receipts for everything, so there is always a paper trail. Another good and downright practical tip to follow is to just spend as much as you would have spent if you were using your own money. And sometimes, you probably should just use your own money. For instance, filing a report to get reimbursed for $4.50 for a breakfast sandwich may reflect poorly on you, under certain circumstances.
You can view the original article here: https://www.themuse.com/advice/on-the-company-dime-expense-report-etiquette-101