The short answer

Usually not, because most rewards rates are much smaller than most card interest rates. A card paying 2% cash back earns far less in a month than a 20% or higher APR charges on a carried balance. Rewards only add up in your favor once you pay the statement in full each month and stop paying interest entirely.

Why the two numbers are not the same size

Rewards rates are typically 1% to 2% of what you spend. Interest rates on a carried balance are commonly well above 15% a year. Comparing them side by side, cents earned against a much larger cost in interest, shows why rewards rarely offset interest for someone carrying a balance.

The rewards program is calculated on your spending. The interest charge is calculated on your balance. Once you carry a balance, those two numbers can end up close in dollar terms even though the rates look nothing alike, simply because the balance is often much larger than a single month's new spending.

How a grace period changes the math entirely

Cards typically offer a grace period on new purchases if you paid the previous statement in full. During a grace period, no interest is charged on new purchases, which is when rewards are pure upside. The moment a balance carries over, most cards lose that grace period on new purchases until the balance is paid in full again, so rewards get earned on spending that is now also accruing interest.

This is the real dividing line: not the rewards rate itself, but whether you are inside or outside the grace period.

A quick way to check where you stand

You do not need to track this every day, just at each statement.

  1. Find your rewards earned for the last statement period.
  2. Find the interest charged for the same period.
  3. Subtract interest from rewards to see your real net position for that month.
  4. If the number is negative, treat the card as a straight cost for now, not a rewards tool.
  5. Recheck once the balance is paid off and the grace period is restored.

Should you stop using the card while paying it down

Many people pause new spending on a card they are paying off, not because rewards are worthless but because it is simpler to track progress on a balance that only goes down. If you keep using it, make sure the extra rewards you earn are not being used to justify carrying the balance longer than you need to.

Worked example · illustrative numbers

Example: $2,000 in monthly spend against a $2,000 balance

These numbers are hypothetical. Say you spend $2,000 a month on a card earning 2% cash back, which comes to $40 in rewards. At the same time, you are carrying a $2,000 balance at 24% APR, which accrues roughly $2,000 x 0.24 / 12, or about $40, in interest that same month.

In this case the rewards and the interest roughly cancel out, meaning the card is not really paying you anything net while the balance sits there. If the balance were $4,000 instead of $2,000, the interest would double to about $80 while the rewards stayed at $40, putting you $40 behind for the month.

Put this into practice with Debtless

Debtless tracks balance, APR and minimum payment for each card you add so you can see the actual monthly interest cost next to your own spending habits. It does not track rewards points or cash back; that comparison is one you still make yourself against your card's rewards statement.

Download Debtless on the App Store

Common questions

Do rewards points work the same way as cash back for this comparison?

The comparison still applies, since points and miles also have a rough dollar value per point. Convert your rewards to an estimated dollar amount and compare that against the interest charged the same period.

Is it worth switching to a no-rewards card while paying down debt?

Not usually just for this reason, since the rewards rate rarely changes the payoff math much either way. The bigger lever is the interest rate itself and how much you pay above the minimum.

What about a card with a large sign-up bonus?

A one-time bonus can be worth more than months of ordinary rewards, but check whether meeting the spending requirement would grow a balance you are already carrying before opening a new card for the bonus alone.

Sources & further reading

General education for U.S. readers, not individualized financial, legal or tax advice. Examples are hypothetical; lender terms and actual interest calculations can differ. Check your current statements and agreements.

Published by Debtless with AI-assisted drafting. How this journal is made · Suggest a correction