List the rewards you would really use
Write down two or three redemptions you would actually make in the next year, such as a statement credit, a supermarket voucher or a specific flight. A currency you never redeem is worth nothing to you, however generous the earn rate looks.
Price each option in pence per point
For each redemption, subtract any cash you still pay from the cash price it replaces and divide by the points needed. Compare the answer with the cashback you would have earned on the same spending.
Check what counts as eligible spending
Read the card's reward terms for exclusions. The terms for one American Express UK cashback card, for example, exclude balance transfers, cash advances, foreign exchange transactions and interest from earning cashback.
Automate full repayment
HSBC suggests setting up a Direct Debit or standing order so you don't miss a repayment. Paying the full statement balance by the due date keeps the interest-free period on purchases that makes rewards worthwhile.