Something I Didn’t Realize About Credit Card Interest Charges

I’d like to think I’m pretty well versed on credit cards, though one thing I’ve never paid much attention to is interest rates. I realize interest rates are of interest (no pun intended) to many people in the country, given how common it is for people to carry a balance on credit cards.

While I think rewards credit cards are great for a majority of people, if you’re someone who can’t control your spending with credit cards, you absolutely shouldn’t get them. Paying 15%+ interest rates will more than offset any rewards you might earn. I realize there are strategic ways to take advantage of credit cards with 0% interest rates for a limited amount of time, though even that comes with downsides (it increases your credit utilization, which could harm your credit score).

All that being said, yesterday Andrew made me aware of something related to credit card interest rates that I wasn’t previously aware of. And I’m kind of surprised by it.

Say you have a credit card with a $1,000 statement balance, you pay off $990 of it, and you have a 12% annual interest rate. After a month, how much do you owe in interest? I would have thought the answer was $0.10 (which is 1% of the $10 you didn’t pay). Apparently that’s not the case, and instead your interest charge would be $10. Yes, the amount you pay in interest could be 100% of the amount you didn’t pay in time after just one month.

What I wasn’t aware of is that if you don’t pay any portion of your credit card bill on time, you’re charged interest for the entire balance that statement period, and not just for the unpaid portion. I’m not sure there’s really any logic for that, but it seems to be the case consistently.

That’s another reason to be sure you always pay your full balance every month. However, I’m sure we’ve all at one point or another had a late payment. I know I have, either because I had something marked wrong in my calendar, I paid most of a balance but not the whole thing by mistake, etc. When that happens, often credit card companies will waive the late fee and interest charges if it’s your first “offense” just by calling and asking nicely.

Maybe everyone else in the world already knew this, though it came as a surprise to me.

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Touche Guest

Thank you for sharing this Ben. I'm in the same boat -- never was a problem so I never had to become aware of this... Someone mentioned that some credit cards don't impose trailing interest on the first month -- which cards are those? (Outside of the 0% introductory APR cards...)

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callum Guest

Grant - You're a Certified Accountant and you didn't understand the fundamental basic of how credit card interest works!? Ben not understanding is fine as he doesn't seem to pay it so it's irrelevant to him, but an accountant!? Ben also doesn't need any "credit" for sharing this revelation given it's not going to make the slightest difference to anyone on this site when deciding whether to take it out or not.

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JC Member

Grant, Not sure why you would think I criticized Ben for posting this article. In fact, I am very happy Ben posted this article to share with others. I was simply trying to answer some additional questions that readers may not have been aware of and that other readers were asking in the comment section. Isn't the purpose of the comments section to share information to assist others and have a dialogue? If Ben feels that my comment was offensive then he can moderate or edit it. If he doesn't feel that my comments are welcome, then I will gladly stop sharing. JC

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Ladytravelbanker Guest

As a banker with Chase, who specializes in credit cards, I always tell my clients to make the credit card work for them, not you working for the credit card. Think of your credit card like a Debit card....once your purchase shows on your online or mobile app deduct it from your checking and pay the credit card this way you won't end up with a balance on your card when your statement closes and you never have to worry about interest charges. This can be done daily, weekly, or bi-weekly. Get those rewards for free!!!

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Grant New Member

@JC Get off your high horse pal. I'm a CPA that pays my bills off every month and I was surprised by this issue earlier in the year as well. Give him credit for being in this industry (and being supported by it) and still reminding people of issues like this. A lesser person wouldn't say anything at all. This is a good blog and he has helped all of us travel more for less $$ out of our pockets.

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