1.
business trip allowance; travel per diem; travel stipend
A monetary allowance paid to employees to cover expenses incurred during business trips, such as meals and incidental costs.
For overseas business trips, the travel allowance is higher than for domestic ones.
Usage
A standard business term. 手当 (allowance) is a productive suffix in workplace vocabulary: 残業手当 (overtime pay), 住宅手当 (housing allowance), 家族手当 (family allowance).