It is fine to use both of these words interchangeably.

hello, in a sense they are the same but, I guess these words are merely used by the doer (i.e. billing coordinator / assustant / etc.) in preparing the account / charges of the recipient (i.e. client / billed party). if you are the one being billed, or asking the specific amount, it's always recommended to use "BILL" ex: 'how much are you going to bill me for the overdue?' in this case, "INVOICE" is less appropriate. :)

"invoice" is a sales slip given by seller to purchaser of goods showing all the particulars of a sale "Bill" is a charge for goods and services.

It is almost the same, but for businese use invoice, for personal use bill. For example: I have a lot of bills to pay (personal, don't use invoice) I have submitted your invoice to the account payable department. (business, don't use bill)

Hi It is the same thing...