A high advertised rewards percentage does not automatically make a credit card your best everyday choice. A card that earns a modest amount on every purchase can beat a card with a higher bonus rate in a category where you do not spend much.
Here is a transparent example you can calculate for yourself. All reward rates and purchases below are hypothetical, not descriptions of any specific available product. Actual card offers have rules, exclusions and possible earning caps.
The two imaginary cards
- Card A: 2% cash back on every eligible purchase, no annual fee.
- Card B: 3% cash back on eligible groceries, 1% on everything else, no annual fee.
Assume both cards return straightforward cash, have no spending cap and the spending described qualifies. Those assumptions matter. We are comparing ongoing rewards only, with no welcome bonus, interest or other card benefits.
Example 1: A household spends $1,000 per month
Let's say your monthly spending is $600 at grocery stores and $400 on everything else.
Card A, 2% everywhere: ($600 + $400) × 0.02 = $20 per month, or $240 per year.
Card B, 3% on groceries and 1% elsewhere: ($600 × 0.03) + ($400 × 0.01) = $22 per month, or $264 per year.
The category card wins by $24 per year, assuming no caps, identical eligibility and no other differences. That is a genuine advantage, but it is much smaller than comparing 3% with 2% in isolation might suggest.
Example 2: Change the grocery budget
Suppose the same household spends only $200 on groceries and $800 elsewhere per month.
Card A still earns $20 per month. Card B earns ($200 × 0.03) + ($800 × 0.01), or $14 per month.
Now the flat-rate card wins by $72 per year.
This is why your category mix matters at least as much as a headline bonus rate. If you buy groceries at a retailer excluded from the issuer's supermarket category, the comparison changes again.
What if the category card has a $95 annual fee?
Return to Example 1, where Card B earned $24 more per year before fees.
If Card B charged a $95 annual fee, its reward total after that fee would be $169, compared with Card A's $240. Card A would come out $71 ahead on these assumptions.
A card with a fee could still win when it offers useful additional benefits, higher eligible spending rates or other features. But only count a statement credit or benefit at the amount it actually saves you, not the maximum amount advertised.
The two-card approach
You are not always limited to one credit card. Suppose you use the hypothetical 3% grocery card only for your eligible $600 grocery spending and the 2% flat-rate card for the other $400.
- Grocery card: $600 × 0.03 = $18 per month.
- Flat-rate card: $400 × 0.02 = $8 per month.
- Together: $26 per month, or $312 annually.
That is $72 more each year than using Card A alone, but it assumes both cards have no fee, no reward restrictions, and no additional costs. Two cards also mean more due dates and accounts to manage.
If a second card would tempt you to overspend or lead to a missed payment, the modest additional rewards may not justify the complexity. Responsible account management comes first.
When higher reward rates are misleading
Caps and activation: An advertised 5% rate might only apply to a limited quarterly spending amount or categories that require enrollment. Purchases past the limit may earn a lower rate.
Merchant category codes: A product bought at a superstore may not count as a supermarket purchase. Delivery services and warehouse clubs can be excluded even if you think of the purchase as groceries.
Points vs cash: Three points per dollar is not necessarily equivalent to 3% cash back. Redemption values can differ by program and redemption method. Use a valuation you can realistically achieve.
Welcome bonuses: A large first-year offer can change the first-year result but not the ongoing annual value. Treat the two separately.
Interest and fees: Any carried debt may cost more than the rewards earned, especially when interest accrues over time. See the CFPB's explanation of credit card interest.
Try the comparison with your own spending
Start with the expenses you already have. Estimate how much qualifies for each card's reward categories, account for annual caps, subtract recurring fees and avoid counting a conditional benefit you would never use.
Then consider the practical side: is one simple card preferable to a small two-card improvement? Can you pay every statement in full on time? Would the new account help or complicate your goals?
Use the Credit and Habit Find My Card tool to compare recorded credit card options using your priorities. Always confirm current issuer terms before applying.
Methodology: All calculations in this article are original hypothetical arithmetic using the stated spending, earning rates and fee assumptions. They are not market averages, audited current issuer offers, projected approval odds or guaranteed payouts.