lump sum premium — единовременная премия*
lump-sum bonus — единовременная [разовая\] премия*
lump sum compensation — единовременная компенсация
lump-sum remuneration — единовременное вознаграждение
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She received a lump sum of €70,507 when she retired.
be paid/taken as a lump sum »The entire amount can be taken as a lump sum.
»If the pension is small, it may be paid as a one-off lump sum payment at age 65.
акордна (або тверда) сума
паушальна сума; одночасна виплата