I require some advice in respect of invoices. I have a client who has failed to pay an invoice within the agreed terms and are also failing to respond to all communication. I have issued a warning that the invoice is liable for Late Payment % charges and that this will also now be due. Within my terms, I also have an agreed clause that failure to pay the invoice within the agreed terms, 15days, that this invoice can be re-calculated at our full rate. As I have had no response again, I now need to issue the first of the new invoices with the % late payment charge added. (And should this not work, I will use the right as per our terms to charge at our full rate, which is considerably more. I am hoping the threat of this will make the client pay.) My query is around how to invoice bot the % for late payment and should it arise the re-calculated amount? Do I credit the original invoice and issue a new invoice? Do I send an invoice for the added % charge? And similarly with the extreme case, how do I invoice at the penalty rate agreed in our terms? Do I credit all the invoices to date and issue the new one? I have no idea which is best to do? Is it a case with all the invoices I also illustrate; Charge, VAT, Late % penalty, Breach of terms etc. then show a new calculated bill? Hopefully someone can assist..