How much of my minimum payment is actually interest?
On a lot of credit cards, roughly a third to a half of the minimum payment is interest — and on some, effectively all of it. Here is how to work out your own number instead of guessing.
The two-minute calculation
Take one card's statement. You need the balance and the APR.
- Monthly interest = balance × (APR ÷ 12). A $6,000 balance at 24% is $6,000 × 0.02 = $120 a month.
- Compare that to the minimum payment. If the minimum is $150, then $120 of it is interest and $30 reduces the debt. That is 80% interest.
Do it for each card and add the interest column up. That total is what your debt costs you to simply exist for one more month. Most people have never calculated it, and it is the number that changes minds.
Why the payoff takes so long
Minimums are typically 1–3% of the balance, or interest plus 1%, with a floor around $25–$35. Because the minimum is a percentage, it falls as the balance falls — so the pace of payoff slows down exactly as you make progress. That is how a mid-sized balance at a normal rate turns into a decade or more of payments, and why "minimums only" projections that assume a fixed payment are wrong in your favour.
Three things that change the number immediately
- Pay anything above the minimum, on the highest rate. Every extra dollar goes straight at principal, and it lowers next month's interest permanently. Even $50 shortens the timeline more than people believe.
- Pay twice a month. Card interest usually accrues on the average daily balance, so the same total, paid earlier, accrues less.
- Ask for a lower APR. A phone call. On an account in good standing it works often enough to be worth the ten minutes, and it drops the interest line for good.
Two traps
Deferred-interest promotions. "No interest for 12 months" on store financing often means interest is accruing the whole time and lands in full if any balance remains at the end. Know your exact end date and clear it before then.
Cash advances. Usually a higher APR with no grace period — interest starts the day you take it, plus a fee.
What to do with the number once you have it
Interest is the price of the time you are taking. Whether it makes sense to pay it faster, restructure, or leave it alone depends on your surplus, your cushion, and what else is at risk. Our free dashboard does this arithmetic for every account you enter — total owed, weighted APR, monthly interest, and the share of each minimum payment that never touches your balance. No opinions, just your own numbers, and you do not pay us for that part.
This is financial education, not legal, tax or investment advice, and it is not a recommendation for your specific situation. Rescue My Finances is not a credit repair organization, debt settlement company or credit counseling agency. See our disclosures.