[Here briefly focus on sample Letter for Requesting Invoice. you can also follow these sample as email request for invoice. You can modify these formats as your requirement.]
Date…
Authority name…
Job designation…(e.g., Manger Sales & Marketing)
ABC Company…
Subject: Requesting Invoice for the month of (Month name)
Dear Sir,
With reference to our purchases for the month of (Date) from you, it is observed that you have not issued Invoices against the goods whatever you supplied as yet. You are requested therefore to issue the stated Invoices at your earliest as we have to close our Accounts. Your earliest response shall highly be appreciated in this regard.
Regards,
Your name…
Job Designation…
Organization name…