When you redeem cash back, most issuers give you a choice: take it as a statement credit, deposit it to a linked bank account, or apply it against a specific purchase. The dollar amounts look identical. The way they hit your finances is not.
A Statement Credit Lowers Your Bill
A statement credit reduces what you owe on the current cycle. Your minimum payment due drops accordingly, but the rewards do not become spendable cash. If you were going to pay the bill in full anyway, the practical effect is identical to receiving cash. If you carry a balance, the credit reduces the principal that accrues interest going forward.
A Deposit Hits Your Bank
A direct deposit converts the cash back to actual liquid cash. You can spend it on anything — including paying down a card with a different issuer. Most banks process these in 1–3 business days.
For travel-card programs that let you redeem points as "cash equivalent" at less than 1¢ per point, this is usually the worst redemption. For pure cash-back cards, deposit and statement credit are equivalent in value.
Reward Drift
The biggest mistake is letting cash back accumulate for years. Most programs do not pay interest on your balance, and many will expire it on long-term inactivity. Sweep cash back at least quarterly into either a high-yield savings account or against a card balance — wherever the dollar earns or saves the most.
A statement credit against a card balance at 24% APR effectively earns you 24% on those dollars — far higher than a high-yield savings rate.
Cash back is most valuable as cash you can deploy. Sweep it quarterly. If you carry any balance, apply it as a statement credit to the highest-APR card you have. If you pay in full every month, deposit it and let it earn yield.