Regulation E §205.11c states “(i) Provisionally credits the consumer’s account in the amount of the alleged error (including interest where applicable) within 10 business days of receiving the error notice.”

My question is on the interest. Do we pay interest for the date of the error forward or interest from the date of the notification from the customer? I was under the impression that we have to pay interest from the date of the error forward. Is this correct or am I wrong?

Sounds like you are thinking correctly. They should not be penalized for the leeway we receive for the provisional credit deadline.

You are required to pay interest from the date of the error forward. See Comment 205.11(c) - 6.

The concept here is putting the customer back in the position he or she would be in if the error had not occurred. So you calculate and pay any interest from the posting date of the transaction, and refund any fees the customer would not have incurred but for the error.