The headline rate and the rate you get
A rewards card advertises a rate. What you receive is that rate applied to a bounded amount of spending, plus a much smaller rate applied to everything else, less an annual fee. Those three adjustments are usually enough to move a 5 percent card to under 2 percent in practice, and the direction of the error is always the same: the advertised number is the ceiling, never the outcome.
Take a card paying 5 percent on the first $1,500 of spending each quarter and 1 percent after, with no fee, held by someone spending $800 a month. That is $2,400 a quarter, so $1,500 earns 5 percent and $900 earns 1 percent: $75 plus $9, or $84 a quarter, $336 a year. Against $9,600 of annual spending that is an effective 3.5 percent. Real, respectable, and not 5 percent.
Where the cap starts biting
The cap is quoted per quarter and lived per month. Divide it by three and you have the monthly spending level at which the bonus rate stops. In the example above that is $500 a month; every dollar past $500 is earning a fifth of what the advertisement implied. Knowing that number changes behaviour more than knowing the rate does, because it tells you when to switch cards mid-month rather than leaving one card in your pocket all quarter.
What an annual fee has to earn back
A fee is not a reason to reject a card, but it is a hurdle with a size. Divide the fee by the effective rate and you have the annual spending required before the card returns a single cent.
| Annual fee | At 2% effective | At 3% effective | At 4% effective |
|---|---|---|---|
| $95 | $4,750/yr | $3,167/yr | $2,375/yr |
| $150 | $7,500/yr | $5,000/yr | $3,750/yr |
| $550 | $27,500/yr | $18,333/yr | $13,750/yr |
Premium cards usually answer this hurdle with credits and benefits rather than rate. Value those the way you would value a gift card to a shop you rarely visit: at what you would actually spend there, not at face. A statement credit you have to remember to trigger, in a category you use twice a year, is worth a fraction of its printed number. Subtract only the part you are confident you will use from the fee before entering it.
Splitting spending across two cards
When the high-rate card caps out, the overflow is earning its poor base rate while a second card sits unused. Moving that overflow to a card with a better base rate raises the total, and the calculator flags this whenever the split beats every single card after both fees. The gain is often real and often small. Two cards mean two due dates, two sets of terms, and a decision at every register, and a few dollars a month buys very little of that attention. The threshold at which the split is worth adopting is personal; the arithmetic only tells you what is on the table.
Points are not dollars until they are
This page treats a point as a cent, which is the common floor for cash redemption. Programmes that pay more through a specific redemption path pay that rate only through that path, and only while the path exists. Programmes with expiry, minimum redemption amounts, or a single retailer as the exit are worth measurably less than face. Rather than modelling any of that, enter a rate you have discounted yourself: if you think the friction costs you a fifth, enter 4 percent where the card says 5.
The thing worth being suspicious about
Every part of this calculation assumes your spending is fixed and the only question is which card processes it. That assumption is the weak point. A rewards rate of 3 percent applied to spending that grew 10 percent because a card made spending feel productive is a loss with a rebate attached. If you cannot look at last year and say your spending was flat, the card comparison is the second question and the first one has not been asked.
Questions people ask
Why is my effective rate so much lower than the advertised one?
Almost always the spending cap. The bonus rate applies to a bounded amount per quarter and everything past it earns the base rate. Divide the quarterly cap by three to find the monthly spending level where it stops, and compare that with what you actually spend.
How should I value points rather than cash back?
Start at a cent per point, which is the usual cash floor, then discount for anything that stands between you and the money: expiry, a minimum redemption, a single redemption channel. Enter the discounted figure as the rate rather than trying to model the programme.
Do sign-up bonuses belong in this comparison?
Not in this one. A bonus is a single payment in year one and this calculator answers a run-rate question about the years after. Work out the run-rate winner first, then decide separately whether a bonus is worth opening an account for.
Is a card with no annual fee always safer?
Safer, not always better. A fee is a hurdle of a known size, and the calculator shows the spending it demands before the card breaks even. If your spending clears that comfortably and the rate is genuinely higher, the fee card wins. If your spending is near the hurdle, it does not, and a bad year makes it worse.