The 5% fine print: spend caps on Citi Custom Cash, Freedom Flex, and friends
By Jangul Aslam — LinkedIn · Published July 11, 2026
"5% cash back" is the loudest number in the card aisle. It's also the most conditional: every card that advertises it caps it, and what happens after the cap is the part the marketing never mentions — on most of these cards, the rate falls to 1%, which is less than a plain 2% card earns on everything.
Here's the entire 5% club we track, with the ceilings computed.
The ceiling table
Maximum yearly bonus spend, and the most each card can beat a flat 2% card by — assuming you fill the cap perfectly, every period:
| Card | The 5–6% deal | Bonus spend ceiling / year | Max edge vs a 2% card | After the cap |
|---|---|---|---|---|
| Citi Custom Cash | 5% on your top eligible category, auto-selected | $500/mo → $6,000 | $180 | 1% |
| Chase Freedom Flex | 5% rotating categories, must activate | $1,500/qtr → $6,000 | $180 | 1% |
| Discover it Cash Back | 5% rotating categories, must activate | $1,500/qtr combined → $6,000 | $180 | 1% |
| U.S. Bank Cash+ | 5% on two categories you choose | $2,000/qtr → $8,000 | $240 | 1% |
| Blue Cash Preferred | 6% on groceries | $6,000/yr | $240 | 1% |
Two things worth sitting with. First, the absolute numbers: the entire premium of a maxed-out 5% card over the most boring card in existence is $180–$240 a year — real money, but a fraction of what the marketing implies. Second, the after-cap cliff: once capped, these cards earn 1%, half of what the flat card pays. A 6% grocery card that's blown through its $6,000 becomes the wrong card at the register for the rest of the year.
The fine print behind the fine print
- Citi Custom Cash is closed to new applicants — if you hold one, the 5%-on-top-category-automatically is genuinely low-effort (no activation); if you don't, you can't get it, which is why it no longer appears in our recommendation rankings. Keep-or-cancel is its own question — we'll cover it in an upcoming post.
- Rotating cards demand activation. Freedom Flex and Discover both require a quarterly click; forget it and the quarter earns base rate. Discover's current quarter spreads 5% across gas, EV charging, transit, flights, and drugstores — one $1,500 combined cap across all of them.
- Cash+ makes you choose two 5% categories each quarter — the highest ceiling of the club ($2,000/qtr), but only as good as your picks.
- Our rankings show these cards at their bonus rate with the cap as a caveat right next to it — that's the "up to $6,000/yr" text on every ranking row, and it's why our engine treats a capped 5% and an uncapped 2% as closer than they look.
The winning pattern: 5% inside the fence, 2% outside
The caps don't make 5% cards bad — they make them components. Inside the cap and category, nothing beats them; outside, a flat card does. That pairing is exactly what our 3-card wallet analysis found: the highest-coverage wallets all pair one capped-bonus card with an uncapped floor.
If you track one thing, track the cap you actually hit. A family filling BCP's $6,000 grocery cap by August needs a switch-at-the-register plan; a household that never crosses $300/month of groceries doesn't need the 6% card's annual fee at all.
Every rate and cap above carries a verification date and issuer source link on its card page, re-checked weekly — caps are exactly the kind of fine print that changes quietly.
Common questions
- What is the Citi Custom Cash 5% limit?
- 5% applies to your top eligible spending category on up to $500 per billing cycle — about $25 of bonus a month — then the rate falls to the card's 1% base. It's also closed to new applicants, so it's a keep-and-use decision, not an apply decision.
- What is the Chase Freedom Flex quarterly cap?
- 5% on that quarter's rotating categories, on up to $1,500 in combined purchases per quarter — a $75 ceiling — after which those purchases earn 1%. You also have to activate the categories each quarter.
- Is a 5% card better than a 2% card?
- Inside the cap and inside the category, yes — by definition. Across a whole year, each 5% card's maximum edge over a flat 2% card is only about $180–$240, and spending past the cap usually earns 1%, which is worse than the 2% card. The winning move is both: the 5% card up to its cap, the flat card after.