What is the Citi Custom Cash® Card and how does it work?

The Citi Custom Cash℠ Card earns 5% cash back on your top eligible spending category each billing cycle — automatically, with no category registration — on up to $500 in spending. Everything else earns 1%. There is no annual fee. The 5% cap and no-registration design set it apart from rotating-category cards that require manual activation. Verify current terms, APR, and bonus offers at citi.com before applying.

The Citi Custom Cash℠ Card earns 5% cash back on whichever eligible category you spend the most in each billing cycle — the card tracks it automatically. That rate applies to the first $500 in that category per cycle (up to $25 cash back at 5%), then drops to 1%. Everything outside your top category earns 1% with no cap.

How the rewards structure works

Cash-back cards with rotating or category-based rewards typically require cardholders to activate or select categories each quarter or cycle; the Citi Custom Cash eliminates that step by automatically applying the 5% to your highest-spend eligible category. — CFPB
Reward structures on credit cards can change; always verify current terms with the card issuer before applying. — CFPB

Eligible 5% categories

As of June 2026, eligible categories include: restaurants, gas stations, grocery stores, select travel, select transit, select streaming services, drugstores, home improvement stores, fitness clubs, and live entertainment. Verify the current category list at citi.com — it can be updated.

Who this card fits

Single-category spenders: if your spending concentrates naturally in one area (like groceries or gas), the auto-detection earns 5% without any effort.
Households that want a simple 'set it and forget it' cash-back card with no annual fee.
People who dislike quarterly activations: Chase Freedom Flex and Discover it both require manual activation; Custom Cash does not.
Not ideal for heavy international travelers — the card charges a foreign transaction fee on non-U.S. purchases.

Key trade-offs

$500 per-cycle cap on the 5% category limits top cash back to $25/month at that rate; heavy spenders in one category may outgrow it.
Only one category earns 5% at a time — multi-category spenders may prefer a flat-rate or tiered card.
Rewards are issued as Citi ThankYou Points; redeem for cash back, or if you also hold a Citi Strata Premier℠, transfer to airline and hotel partners at higher value.

Looking for a card with no foreign transaction fee? Compare the best travel credit cards for 2026. Not sure whether cash back or travel miles fits you? See cash back vs travel rewards.

Key takeaways

Earns 5% on your top eligible spend category automatically — no activation needed.
5% applies to the first $500 per billing cycle in that category; 1% on everything else.
No annual fee; charges a foreign transaction fee on international purchases.
Verify current APR, bonus offer, and eligible categories at citi.com before applying.

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