I overdrew by just under £170 for 3.5 hours. First time this ever happened to me, I had forgotten that today was the 1st (i.e. bills to be paid), and had a fairly large additional non-recurring payment which exceeded how much I had left in my current account.
Now I shouldn't be charged any fees since I did not exceed my agreed overdraft, but there is that 15.9% EAR. I am not sure how banks normally calculate those interests. Are interest overdraft calculated by days? Or a whole month ()?
Cheers.