credit card rebates

[Unregistered]

are credit card cash back rebates taxable income

[Bees Knees]

No, not unless you took a tax deduction for the purchase price of the things purchased with the credit card.

[fliszt]

rebates

I agree with Bees Knees. Go through the purchases to find items deducted on tax return to develope a % of deductible expenses. Then multiply the rebate by that % and then that would be your reportable income.
Larry M