Can credit card companies charge interest after you pay balance in full?

Being an old timer on this board I should know the answer to this....
I bought a laptop for $450 on my CapitalOne card. I paid the entire balance in full and on time, leaving a statement balance of $0 and I did not use the card after that.
Yesterday I got a text alert that my account was $9.45 past due....$4.45 in interest and a $5.00 past due fee. I thought that when you paid your account off in full and on time that interest would not accrue. I just barely caught this from going 30 days past due, to where this would have hit my credit report. Anyone know anything about this?

Dan B2012-08-03T14:42:57Z

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To avoid interest, you must:
1. Have had a $0 balance as of the CLOSING date of the previous month's statement (not the payment due date). This is the one 'gotcha' that most don't understand.
2. Paid the current balance in full and your payment must be posted on or before the due date.
3. Must not have used a cash advance to make the purchase (no grace period here).

Sounds like you have a 9.9% card. That would explain the $4.45 interest. Check with CapOne to see if they screwed up. Understand that a payment in the mail or on line is not considered paid until it is actually posted to your account. Did your account show the amount you paid?

Steve D2012-08-03T10:12:22Z

Go back to the bill after you paid off the laptop - find out when they credited your account for the payment and then check your checking account for when they debited your checking account - see if the dates match. And then compare the two dates to the actual due date. I would hazard a guess that Cap One took a day or two to catch up to the cashed/debited date (Citi does this all the time with the payment on my second mortgage, but they are also good about crediting back the 7 cents in excess interest :).

Because of the delay many banks have in crediting accounts, your definition of on time does not always jive with Cap One's "reality" (even though you were probably on time). If the debit was prior to the due date, then you have a real valid argument for getting them to waive the interest and late fee (especially if your bank can provide some sort of proof that you can send).

Lauren F2012-08-03T12:02:55Z

Generally, you should not have any interest if your balance was paid in full by the due date. There are two things I can possibly think of might have caused this:
1. Your account payment posted a day or two (possibly because the bank misapplied your payment to another person's account).
2. Your account is subject to double cycle billing, in which they look to see if you had a balance the month before, and use the average balance of the two to calculate interest. Double cycle is less common than it used to be.

Call them up and ask - maybe they made a mistake.

Go with the flow2012-08-03T10:58:50Z

Strange.
Only thing I can think of is that you were carrying balances before.
But you know all about "left over interest".
I would call that card company or check your statement online to see if that laptop company for some reason made an extra charge later on.

Ti2012-08-03T10:22:04Z

Read your credit card agreement.. Some sub-prime cards, Capital One being one of them, charge interest for the month in which you owed money. For example, you spent 450 on Friday, and payed it off the following Monday, you would owe interest on the 450 for the entire month.

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