Compensation for working beyond regular hours; a standard term in Japanese employment contexts.
I had a lot of overtime this month, so I got a fair amount of overtime pay.
残業手当 is a more common synonym for overtime pay. 居残り手当 is slightly less frequent but carries the same meaning.
Standard kanji spelling.
Variant spelling using 手当て instead of 手当.
Compound of 居残り (staying behind, from 居る 'to be' + 残る 'to remain') and 手当 (allowance, pay).