I use my credit card to pay business expenses. I submit recepts to my employer. They reimburse me for the expenses in full. At the end of the year I get cash back equal to a percentage of all purchases. To the best of my knowledge my employer does not require me to return a portion of this cash back bonus.
Do I have to treat a portion of my cash back bonus as income? [My understanding is that in general, these are treated as a delayed discount on the goods bought so aren't in general taxable, but may affect the cost basis of durable items. Since reimbursements are generally limited to no more than the amount actually paid...]
This feels like it could be a massive paperwork hassle for a relatively small amount of money --- tens of dollars --- especially since different purchase qualify for different bonuses in a poorly documented fashion.
If its taxable income, where shoudl I report it? Is it also subject to payroll taxes?