What is the cash back percentage on my Brightside Spend Mastercard®? Theo July 02, 2020 19:06 Updated You receive 0.5% cash back on all posted purchases (online or in-store) made with your Brightside Spend Mastercard®. Related articles When do I get my cash back reward, and how is it calculated? What is a Brightside Spend Mastercard®? Are there any limitations or exclusions for where I can get cash back rewards? How do I view my current cash back reward? Why didn't I get cash back on an eligible purchase?