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Are these scenarios considered as taxable income?
You can always reduce the income by the direct expenses required to earn it, and figure out whether it is ultimately a net profit or loss.   The net profit is taxable income.  The loss may be tax deductible if the underlying thing is tax deductible.    For the book, the $50 revenue required a $100 expense, so that's a $50 net loss.  You don't owe any income tax since it's a loss.  You could take the loss as a tax deduction if you have a business trading books, or if buying the book would be tax deductible for some reason.  Note that in the latter case you can only deduct the $50 not the $100.  For the airline ticket, it is to compensate you for the losses you took as a result if the delayed flight. So you tally up the $22 meal you had in the airport waiting for news, the $110 on the motel room you rented or forfeited, any other way you can peg a cash value to any losses you took.  Total them up, again, a net loss is only deductible if the travel is already deductible. Note that if the actual expenses (book, flight) were tax deductible for some reason, the cash-back reduces the amount of your tax deduction, so it has the same effect as the sale/gift being taxable income.