I pay my cc in full each month. This month I managed to accidentally duplicate last months payment ($1050) instead of this months statement balance ($1193). Then I got hit with a $21 finance charge...
Guess I'm not clear how payment is applied. I have accrued new charges over the month that will be reflected on the next statement but shouldn't the interest only be for the $140 difference, not the total balance of the card which is currently about $2060? Or did they essentially apply my payment only to new charges and charge me interest on the old? In 3 years I've been carrying a rewards card I've never done this. I know its only $20 but still!
Guess I'm not clear how payment is applied. I have accrued new charges over the month that will be reflected on the next statement but shouldn't the interest only be for the $140 difference, not the total balance of the card which is currently about $2060? Or did they essentially apply my payment only to new charges and charge me interest on the old? In 3 years I've been carrying a rewards card I've never done this. I know its only $20 but still!

The card was Chase. Super impressed with and appreciative of their response.
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