Cashback is a game of avoiding own goals. The math almost always works — until one of these seven mistakes quietly cancels it out.
1. Paying an annual fee that doesn't pencil out
If a $95 fee only earns you $60 more than a no-fee card, you've paid the bank to hold your money. Do the math annually, not once at signup.
2. Forgetting to activate quarterly categories
Rotating 5% cards require you to click 'Activate' every quarter. Miss the click and the entire bonus disappears.
3. Chasing spend for a signup bonus
Buying things you don't need to hit a $4,000 spend target erases the bonus and then some. Only chase bonuses you'd hit naturally.
4. Carrying a balance
A 20%+ APR wipes out years of cashback in a single billing cycle. If you carry a balance, focus on the interest rate first and rewards second.
5. Skipping the portal click
Going straight to the retailer costs you the biggest single layer of stacking. One extra click, one extra tab.
6. Redeeming into gift cards you'll never use
Statement credit or direct deposit turns rewards into money. Gift cards you forget about turn rewards into breakage — for the bank, not you.
7. Not tracking anything
You cannot optimize what you don't measure. A one-line note in your phone after each order is enough.