How-to
How do you stop paying the same invoice twice?
By Tim White · Last updated
You stop paying the same invoice twice by detecting duplicates before payment: match new invoices against ones you have already recorded by vendor, invoice number, and amount, and flag exact matches. InvoiceJet does this automatically on every invoice, so a bill that arrives twice (once by email, once on paper) is caught before it is paid.
Why duplicate payments happen
The same invoice reaches you through two channels: a vendor emails it and also mails a paper copy, or a colleague forwards one you already entered. Under time pressure, both get paid. It is one of the most common and most avoidable ways small businesses lose money.
How detection works
Exact-duplicate detection compares the identifying fields of a new invoice, the same vendor, invoice number, and amount, against what you have already recorded. A match is flagged before the invoice moves toward payment.
Because InvoiceJet extracts and verifies those fields with a confidence level on each, the comparison is reliable: it is matching verified data, not a guess.
What an exact match will and will not catch
Matching on vendor, number, and amount catches the common case: the same bill arriving twice. It will not catch a vendor who reissues the same charge under a fresh invoice number, since the number no longer lines up. For those, watch for a second bill from the same vendor, same amount, close in time.
It also should not flag honest lookalikes, like two identical monthly retainers or a deposit and a final bill that share a round figure. So when something is flagged, look before you drop it: confirm it is the same charge, not just the same numbers.
Common questions
What counts as a duplicate?
An exact match on vendor, invoice number, and amount. That combination is specific enough to catch true duplicates without flagging two legitimate invoices from the same vendor.
What is a duplicate payment?
A duplicate payment is paying the same invoice more than once. It usually happens when a bill arrives through two channels, or when the same invoice is entered twice under time pressure.
How do you recover a duplicate payment you have already made?
Contact the vendor to request a refund or a credit note applied against a future invoice. Catching the duplicate before payment avoids the recovery effort entirely, which is why detection at capture matters.
Sources
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