tipping w/other ppl's money (coworkers, boss)

[SackUp]

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similar but different:

Solo taxi ride: the receipt is for the amount of the fare. Do I just write next to it the tip amount? Or do I just tip out of pocket? I kind of don't mind tipping on my own since theoretically my tip is a reward for the driver for providing a service to me.

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Have him give you a receipt including the tip.