It’s a bonus equal to 50% of your prior year’s cash backs earnings. For example, if you make purchases with your credit card and earn $200 cash back for it in one year, at the end of the year you will receive a bonus equal to 50% of what you earned that year, which equals to $100. So the total amount of cash back you get for that year is $200+$100=$300. Do note that the end of the year means your membership anniversary, not the end of a calendar year.
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All rates and fees, and other terms and conditions of the products mentioned in this article/post are actual as of the last update date but are subject to change. See the current products' Terms & Conditions on the issuing banks' websites.