on-cost
C1CEFR level
70/100Rarity: rare
TechnicalRegister
An additional cost incurred on top of a basic wage or expense, such as employer contributions.
The labour rate looked cheap until you loaded the employer on-costs of pension and national insurance.
Rarity runs from 0 (a word everyone knows) to 100 (almost never seen outside specialist or literary writing). Level is the word's real difficulty on the CEFR scale, from A1 to C2.
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