per diem (allowance)

Per diem (Latin for ‘per day’ or ‘for each day’) or daily allowance is a specific amount of money an organization gives an individual, often an employee, per day to cover living expenses when traveling for work.

A per diem can include part or all of the expenses incurred, for example it may exclude accommodation (for which reimbursement may be available on presentation of receipts) and only cover meals. Per diem is also used as an adjective and an adverb. Travel, particularly by motor vehicles, is often reimbursed at a rate determined only by distance travelled, e.g., the US Business Mileage Reimbursement Rate.

Fixed per diem (and per mile) rates eliminate the need for employees to prepare, and employers to scrutinise, a detailed expense report with supporting receipts to document amounts spent while travelling on business. Instead, employers pay employees a standard daily rate without regard to actual expenditure.

https://en.wikipedia.org/wiki/Per_diem