Antonyms for "payout" might include "reinvestment," "savings," "accumulation," "investment," or "retention." When a company chooses to reinvest their profits, they're putting their earnings back into the business rather than paying them out to shareholders or owners. Savings and accumulation also suggest the idea of keeping funds for future use, rather than spending or distributing them immediately. Investment implies putting money into something that will hopefully generate a return in the future, rather than simply paying out money that has already been earned. Finally, retention suggests holding onto something rather than giving it up, which can be an antonym for payout in certain contexts.