noun
overtime allowance; shift differential; salary supplement for inconvenient hours
A wage supplement paid for work performed outside normal hours, such as late-night, early-morning, or overtime shifts. Often used in labor contexts; compare 割増賃金.
See also: 割増賃金
深夜勤務には割増手当が支給される。
A shift differential is paid for late-night work.
この会社では、休日出勤に割増手当が出る。
At this company, a salary supplement is given for working on holidays.
割増賃金 is a broader term for premium wages, often used in legal contexts, while 割増手当 specifically refers to an allowance or supplement paid on top of base salary.
Compound of 割増 (premium, extra charge) and 手当 (allowance, benefit).