Lump-sum payment is like getting a giant check handed to you all at once—instead of dribs and drabs over months or years. Think lottery winnings, a retirement buyout, or settling a debt in one go. It’s the “here’s everything now” deal, whether you’re cashing out investments, nailing a lawsuit payout, or opting for instant cash over patience. Quick boost? Yes. Tax bomb? Maybe. (Pro tip: Budget like your inner adult is watching.)