Writing an effective follow-up letter on an unpaid invoice requires clarity, politeness, and a firm tone. It's important to clearly state the purpose of the letter, provide specific details about the unpaid invoice, and set a deadline for payment. Avoiding ambiguous language and ensuring all necessary information is included will help facilitate clear communication and encourage prompt action.
Sample Letter of Follow up Regarding the Pending Invoice Payment
To,
_________,
_________,
_________ (mention receiver’s details)
Date: __/__/_____ (date)
Subject: Follow-up on due payment
Sir/ Madam,
I _________ (Name) write this letter on behalf of _______________ (mention company name) in order to follow up on status of our pending payment that was to be done against our invoice _______ (invoice number) that was issued on __/__/____ (date). We have sent the reminder to you about the due payment, but no amount has been credited to our account as of date.
In this regard, we request you to kindly pay the amount of _______ (mention pending amount) by the end of ________ (mention date).
Kindly consider this as a final reminder letter. You may reach us out at _____________ (mention contact details).
Yours truly,
__________ (Signature),
__________ (Your name),
__________ (Designation)
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Sandeep Bhandari 
Deepanshu Thakral