This question is for a client of mine. She owns a licensing company which includes filing for licenses for people that sometimes require a fee (not a fee to her, but a fee to file, she just does it for them). She charges a fee for her services, and then passes on that filing fee to her customer as well. Apparently, she charges for everything first, then files for them. Occasionally, she overestimates how much it will cost to file (the fee she passes on to her customer), and then it would seem she would owe her customer a refund. Rather than issuing a refund, she'd rather just keep the overage. What would that be called and how would that be recorded in her books? I would think it would be income, but is it "other income" in her chart of accounts? Or can it be given any name she wants? Also, would she then be required to pay sales tax on it? Originally, she didn't charge sales tax on it, but since she's accepting it as income would she need to report it on her sales tax report and pay sales tax on it?