How to recover a duplicate payment from a vendor

Confirm a duplicate vendor payment, choose between a refund and a credit note, ask the vendor with a ready-made email, and record the recovery.

Vendors are generally willing to return a duplicate payment once they see clear evidence. The work is in proving it really is a duplicate, choosing how to get the money back, and closing it out in your books so it doesn't resurface at the next reconciliation.

Confirm it really is a duplicate

Before you contact anyone, put together a short file that would convince a skeptical colleague.

Evidence to collect

Both bill records, with the source document behind each and how it arrived (email, supplier portal, mail or a capture tool).
Both payments: dates, amounts, method, payment run, and the check number or bank reference.
Bank statement lines showing that both payments cleared. A canceled scheduled payment, an uncashed check or a returned transfer isn't a duplicate payment.
The purchase order, receipt or contract, showing one delivery or one service period.
The vendor's statement, if you can get it. Two receipts against one invoice, unapplied cash or a credit balance in your favor all support your case.

Rule out the look-alikes

Some pairs look like duplicates and aren't:

Recurring charges for the same amount: rent, subscriptions, retainers, installments.
Split deliveries, partial invoices, or a deposit followed by a final invoice for the same figure.
A second payment the vendor applied to an older invoice you haven't recorded. Then you have a missing bill, not a refund to claim.
A duplicate in your books only. If the bank shows one payment, the payment was recorded twice; that's a bookkeeping fix, not a conversation with the vendor.
A duplicate already corrected by a credit note, refund or void that hasn't been matched yet.

Credit note or refund?

The right choice depends on the relationship and the amount.

A credit note against future invoices

This suits a vendor you buy from regularly, where the amount is modest compared with what you spend with them. It's quick, the vendor doesn't have to make a payment, and it usually clears within a billing cycle or two. The downsides: your cash sits with the vendor until it's used, and credits get forgotten, so track it until it's fully applied.

A refund

Ask for a refund when the amount is large, the vendor is occasional, you're ending the relationship, the vendor looks financially shaky, or the credit would otherwise sit unused for months. Refunds take longer, because the vendor's own approval process applies.

Whichever you choose, agree it in writing first. Don't short-pay the next invoice on your own initiative; the vendor's receivables team will see an underpayment and chase it. Once the vendor confirms the credit, quote their credit note number or confirmation on your remittance.

Ask the vendor

Write to the vendor's accounts receivable or credit control team, not only your sales contact, and attach the remittance or bank evidence for both payments.

Email template

Subject: Duplicate payment of invoice [Invoice number], [Your company name]

Hello [Contact name],

We've found that we paid [Vendor name] invoice [Invoice number], dated [Invoice date], twice. Both payments were for [Amount], made on [Payment dates] with references [Payment references]. Copies of both remittances are attached.

Could you confirm that you received both payments and let us know how you'd like to settle the second one? Either of these works for us:

a refund of [Amount] to the account the payment came from, or

a credit note for [Amount] that we can apply against your next invoice.

If the second payment has already been applied to another invoice on our account, please send a statement showing how it was allocated so we can update our records.

Our account number with you is [Account number]. If your records show something different, I'm happy to go through it.

Thank you,

[Your name], [Job title], [Your company name], [Phone number]

If you haven't heard back within two weeks, follow up once, then ask for the vendor's finance manager. Keep every reply with the case file.

Record the recovery in your books

Until the money comes back as cash or is used against a bill, the extra payment is an amount the vendor owes you. It should sit as a debit balance on the vendor's account (or as a receivable), not disappear into an expense account. How you get there depends on what was duplicated:

You entered one invoice twice and paid both. Void or reverse the duplicate bill. That removes the duplicate expense and any sales tax, VAT or GST recorded on it, and leaves the second payment as a debit balance with the vendor. You're correcting your own entry, so the vendor usually doesn't need to issue a credit note; ask for written confirmation of the overpayment for your file.
The vendor issued two invoices for the same goods or service, and you paid both. Ask the vendor for a credit note canceling the duplicate invoice, and record it against their account. That corrects both sets of books, including any tax.
You entered the invoice once but paid it twice. If the second payment was recorded against the vendor, the debit balance is already there. If it was coded straight to an expense account, reclassify it to the vendor.

Then close it out:

Refund received: record the receipt against the vendor's account, which clears the debit balance. Don't post it to other income; that leaves the debit balance in place and overstates income.
Credit used: apply the debit balance or credit note to the next bill, so you pay only the difference.

Most accounting systems have a standard way to do this. QuickBooks Online, for example, documents a vendor refund as a vendor credit plus a bank deposit coded to Accounts Payable, linked through Pay bills. Xero records a supplier overpayment that can be applied to a later bill or refunded. Use your system's own method rather than a manual journal, so the vendor ledger stays accurate.

If the original period is closed, the correction normally goes in the current period. If tax was recorded on the duplicate, how and when the correction is reported depends on where you file, so check with whoever prepares your sales tax, VAT or GST returns. Attach the vendor's confirmation, credit note or refund remittance to the transaction.

Prevent it from happening again

Clean up the vendor master

Look for vendors that share a tax or VAT number, bank account, address or phone number, and for names that differ only by punctuation or a suffix such as Ltd or Inc.
Merge or deactivate the duplicates, limit who can create vendors, and require a search for an existing record before a new one is added.

Tighten entry and matching controls

Agree one rule for invoice numbers, such as exactly as printed including prefixes and leading zeros, and never leave the field blank.
Bring invoices in through one channel. If you use a capture tool, don't also forward the same emails into your accounting system.
Pay from invoices, never from statements or reminders.
Turn on your system's duplicate warnings, and make them errors where the system allows.
Match invoices to purchase orders and receipts where you can, and keep entering bills and approving payments as separate jobs.
Record manual or urgent payments against the bill straight away so the next payment run doesn't pay it again, and review each run sorted by vendor and amount before releasing it.

Review on a schedule

Run a duplicate review on your bills and payments every month or quarter, while the paper trail is fresh.
Reconcile statements from your largest vendors. A credit balance on their side is often the first sign of a duplicate.
Note the root cause of each duplicate you recover. Over time the causes tend to repeat, which tells you which control to fix first.

If you need a list of suspected duplicates to work from, PaidTwice can produce one from a bills or payments export. Drop the CSV or Excel file into PaidTwice and the scan runs entirely in your browser; the file is never uploaded to a server. Duplicates that a credit note has already reversed are set aside, and on a paid plan, saved audits let you mark each finding as confirmed, not a duplicate or recovered, so the recovery work has its own record.