I have a 0% interest deal on a credit card balance, which will be paid off in full by the end of the interest free period in December.
I just purchased something on Groupon for £14.95, and without thinking/paying much attention I clicked on 'buy' and as it went through, I noticed the card number was not my debit card. It was that split second realisation that while I recognised the saved credit card number, it was not my normal bank account! I haven't used Groupon for quite a long time, and obviously used my CC last time I did. Which I can't remember what for as normally I pay by Paypal, and because I no longer use that card, for day to day purchases, only my bank account, I didn't pay attention.
So, my question now is, how much will that cost me in interest? The interest on normal purchases is very high on the CC (29%) which is not normally a problem as we have never paid interest on it!