noun
lump-sum payment; payment in full
Refers to paying the entire amount at once, as opposed to installment payments. Common in contexts like taxes, purchases, or settlements.
この商品は一括払いのみで、分割払いはできません。
This item is available only by lump-sum payment; installment payments are not accepted.
If you pay your taxes in a lump sum, you may get a small discount.