Invoice Dispute Letter To Vendor
When a vendor bills you for the wrong amount, wrong items, or work you never ordered, silence is the worst response — unpaid disputed invoices attract late fees while the error sits uncorrected. This letter formally disputes the charge, states what you believe is correct, and asks for a corrected invoice.
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When and how to use this letter
Send this letter as soon as you spot the error — disputing promptly protects you against late fees and shows you act in good faith. Most vendor contracts require disputes to be raised within a set window, often 15 to 30 days, so check your agreement first and do not let the invoice age while you decide. Email the letter to the vendor's accounts contact and copy your own records; attach the purchase order, delivery note, or contract clause that proves your case.
Be precise about what you dispute and what you do not. Withholding the entire invoice over a partial error looks unreasonable, so state the undisputed amount and offer to pay it on receipt of a corrected invoice — this positions you as the reasonable party and keeps the vendor cooperative. Number the discrepancies if there are several, so each can be checked off in reply.
Keep the tone factual rather than accusatory; billing errors are usually clerical, and an aggressive letter over a typo poisons a supplier you still need. If the vendor rejects your dispute, escalate calmly: request a credit note, propose mediation, or refer to the contract's dispute-resolution clause rather than simply refusing to pay.
A non-obvious tip: pay the undisputed portion by bank transfer with the invoice number as the reference, and keep the transfer slip. If the dispute later reaches a third party, a clean record of having paid what you agreed you owed is powerful evidence of good faith.
Frequently asked questions
Can I refuse to pay the whole invoice if only part is wrong?
How long do I have to dispute an invoice?
What if the vendor ignores my dispute letter?
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