The Quick Version
- Flat-rate cards like the Citi Double Cash and Wells Fargo Active Cash pay an unlimited 2% on every purchase with no categories to track and no annual fee.
- Tiered cards pay more in bonus categories — the Blue Cash Preferred earns 6% at U.S. supermarkets on up to $6,000 a year — but drop to 1% outside them.
- A 3%/1% card such as the Capital One Savor only beats a 2% flat card if more than half your card spending lands in its bonus categories.
- The Blue Cash Preferred’s supermarket edge maxes out at $240 a year over a 2% card, and its $95 annual fee (after year one) takes a big bite of that.
- Heavy grocery and streaming spenders earn more with tiers; everyone else earns more at a flat 2% — and pairing one of each usually beats either alone.
If your grocery and streaming bills dominate your card spending, a tiered card earns more — often meaningfully more. If your spending is spread across rent-adjacent bills, shopping, travel, and everything in between, a flat 2% card wins, and it wins without asking you to remember a single category.
That is the whole decision, but the crossover point is worth knowing precisely, because tiered cards look better in advertising than they perform in diffuse budgets. This comparison uses four cards — two flat, two tiered — and runs the same $20,000 of annual spending through each to show exactly where the lines cross.
How Each Structure Pays You
A flat-rate card pays one rate on everything. The Citi Double Cash earns 1% when you buy and another 1% as you pay, with no caps, which works out to 2% on every purchase you pay off. The Wells Fargo Active Cash is the same idea with simpler mechanics: an unlimited 2% in cash rewards on purchases for a $0 annual fee. Neither card cares what you bought.
A tiered card pays different rates by merchant category. The Blue Cash Preferred from American Express earns 6% at U.S. supermarkets on up to $6,000 a year in purchases, 6% on select U.S. streaming subscriptions, 3% on transit and at U.S. gas stations, and 1% everywhere else. The Capital One Savor takes a broader, shallower cut: unlimited 3% at grocery stores, on dining, entertainment, and popular streaming, with 1% on everything else and no annual fee. The pattern is consistent across the category: the bonus rates are two to six times the flat rate, and the base rate is half of it.
Four Cards, Two Philosophies
| Citi Double Cash | Wells Fargo Active Cash | Amex Blue Cash Preferred | Capital One Savor | |
|---|---|---|---|---|
| Structure | Flat | Flat | Tiered | Tiered |
| Annual fee | $0 | $0 | $0 intro first year, then $95 | $0 |
| Headline rate | 2% on everything (1% buy + 1% pay) | 2% on everything | 6% U.S. supermarkets and select U.S. streaming | 3% groceries, dining, entertainment, streaming |
| Other bonus rates | 5% total on Citi Travel hotel, car, and attraction bookings | None | 3% transit and U.S. gas | 5% on hotels and rental cars via Capital One Travel |
| Base rate | 2% | 2% | 1% | 1% |
| Caps | None | None | Supermarket 6% capped at $6,000/yr | None published |
| Welcome offer | See issuer site | $100 after $500 in 3 months | $250 after $3,000 in 6 months | $200 after $500 in 3 months |
Welcome offers change; confirm current terms on each issuer’s site before applying. The structural rows are the durable part of the table: the flat cards never pay less than 2%, and the tiered cards never pay more than 1% once you leave their categories.
The Crossover Math
Take a household that puts $20,000 a year on one card: $6,000 at supermarkets, $3,000 on dining, $1,500 on gas, $500 on streaming, and $9,000 on everything else. Here is what each card returns on identical spending.
| Card | Cash back earned | Annual fee (after year one) | Net |
|---|---|---|---|
| Citi Double Cash / Active Cash (2% flat) | $400 | $0 | $400 |
| Blue Cash Preferred | $555 | $95 | $460 |
| Capital One Savor | $390 | $0 | $390 |
Two things stand out. First, the Blue Cash Preferred wins this profile even after its fee — $360 of its total comes from the supermarket category alone. Second, the Savor loses to a plain 2% card on the very same spending, because its 3% categories cover just under half the budget and the 1% base rate drags down the rest.
Now spread the same $20,000 out: $3,000 groceries, $1,500 dining, $1,000 gas, $500 streaming, $14,000 everything else. The flat card still returns $400. The Blue Cash Preferred earns $395 and nets $300 after the fee. The Savor nets $300 as well. Diffuse the spending and both tiered cards fall a full hundred dollars behind.
The 50% Rule for 3% Cards
A card that pays 3% in categories and 1% elsewhere beats a 2% flat card only when more than half your spending lands in the 3% categories. Each bonus dollar gains you a penny over the flat card and each base-rate dollar loses one, so the two halves have to at least balance.
The Blue Cash Preferred’s math is sharper-edged because of the cap and the fee. Its supermarket advantage over a 2% card is 4 cents per dollar, but only on the first $6,000 — a maximum edge of $240 a year, to which streaming, gas, and transit add from there. After year one, the $95 annual fee consumes most of a thin margin, and every dollar of non-category spending at 1% gives another penny back to the flat card. As a rough screen: below about $4,000 a year in supermarket spending, it is hard for this card to beat a free 2% card as your only card.
Where the Flat Rate Wins
Flat-rate cards win on everything tiered cards treat as filler: insurance premiums, utilities, medical bills, car repairs, online shopping outside a bonus category, daycare, tuition-adjacent fees. For most budgets this “everything else” line is the single largest line, and it is exactly where 2% doubles the tiered cards’ 1%.
They also win on attention. There are no caps to track, no category definitions to check — a warehouse club or a corner store often does not code as a supermarket, and the 6% never materializes. A flat card cannot disappoint you that way. If you want one card and no homework, the 2% card is the correct default, and our cash back card rankings cover the current field.
Where Tiers Win
Tiered cards win when a bonus category is genuinely large in your budget. A family spending $500 a month at supermarkets hits the Blue Cash Preferred’s cap exactly and collects $360 a year from that category alone — $240 more than a 2% card pays on the same purchases. Add streaming at 6% and the card clears its fee with room to spare, which is why it anchors our grocery rewards guide.
The Savor’s case is different: it charges nothing, so it does not have to clear a fee — it only has to clear the 50% rule. A renter who eats out constantly, splits groceries with roommates, and buys concert tickets can push dining, groceries, entertainment, and streaming past half of total spending without trying. For that spender the Savor out-earns 2% flat every month, and the $200 bonus after $500 in the first three months is an easier reach than most.
The Case for Carrying One of Each
The comparison has a quiet third answer: the structures are complements, not rivals. A tiered card for its strong categories plus a flat card for everything else earns more than either card alone on every spending profile — the tiered card’s weakness (its 1% base) is exactly what the flat card fixes. On the concentrated profile above, Blue Cash Preferred categories plus a 2% card on the remainder returns $675 gross against $555 for the Amex alone and $400 for the flat card alone.
The cost of the pair is one more account to manage and, for the Amex, the fee math stays the same — the pairing has to justify each card separately. If that appeals, our card combo strategy guide works through which pairings cover the most spending with the fewest cards.
Frequently Asked Questions
As an only card, usually yes — unless supermarkets and streaming are a large share of your spending. The 6% rate applies to a capped slice of one category; the 2% applies to everything. Run your own grocery total against the $240 maximum category edge and the $95 fee before deciding.
The two covered here do not. Citi states the Double Cash has no caps on cash back earned, and Wells Fargo advertises the Active Cash rate as unlimited. Caps are a tiered-card feature, used to limit the cost of the high headline rates.
Supermarket purchases beyond $6,000 in a year earn 1%. A family that spends $9,000 at supermarkets effectively earns about 4.3% on the category overall — still strong, but the blended rate falls as spending rises past the cap.
Flat, in most cases. A 2% card with no annual fee performs well no matter how your spending shifts, and you can add a category card later once a year of statements shows you where your money actually goes.
