The headline-cashback trap
Marketing pages lead with the highest possible reward tier — often gated behind a token stake or a premium membership. The rate most users actually earn, after caps, is far lower.
The four costs that eat rewards
Net value is cashback minus the costs you actually incur.
- FX fee on foreign-currency spend
- ATM fee on cash withdrawals
- Monthly or plan fees
- Cashback caps that throttle high spenders
Compare net value, not headline rate
Use the OpenRate net-value calculator on any card or comparison page: enter your spend, FX share and ATM usage, and the ranking re-sorts by what you'd keep. At $2,000/month with 30% foreign spend, low-FX cards routinely beat higher-cashback cards.