Make sure to include the word “invoice” at the top of the proforma invoice so that your client can have an idea of what he/she is looking at.You can also see Standard Invoice Templates. Although there is not set rule on what to include in a proforma invoice, there are certain basic elements that ought to be there in your invoice to make it sensible and relative. The format of any invoice ranges from business to business and it is up to the person requesting the payment what he/she wants to include while requesting invoices. Download Now What Should Proforma Invoice Include?