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In what cases can a business refuse to take cash?
The Federal Reserve website notes that creditors must accept cash for debts on services already rendered, but that businesses may refuse cash for services not yet rendered unless prohibited by local law. The Treasury website includes examples of businesses limiting what cash they will accept:  For example, a bus line may prohibit payment of fares in pennies or   dollar bills. In addition, movie theaters, convenience stores and gas   stations may refuse to accept large denomination currency (usually   notes above $20) as a matter of policy.