Factoring companies verify invoices by confirming with your customer that the work was delivered, the amount is correct, and no dispute exists. That confirmation usually happens by email, phone call to accounts payable, or a check inside your customer’s vendor portal, and it typically takes a few hours to a few business days. Until it clears, your advance does not fund. Verification is a common reason a factoring payment arrives later than the business owner expected.
Most explanations of this process are written from the factor’s point of view. The more useful question, if you are the one waiting on the money, is what verification looks like from your desk: what your customer is asked, what you can do to speed it up, and which of your own habits are quietly slowing it down.
What your customer is actually asked
Verification is deliberately narrow. A factor is not asking your customer to vouch for you or to comment on the relationship. The questions are usually limited to four points: was the invoice received, is the amount correct, has the work been accepted, and is there any dispute or offset pending.
Your customer is not being asked to approve the factoring arrangement or to agree to anything new. In a notification facility they will also receive a notice of assignment telling them where to send payment. In a confidential arrangement the contact may look like a routine accounts payable query, which is covered in more detail in our explanation of non-notification factoring.
For most business owners the surprise is how little friction this creates. Accounts payable departments field these confirmations constantly. The friction, when it appears, is almost always procedural rather than relational.
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What actually slows verification down
Five things account for most delays, and four of them are inside your control.
The wrong contact is first. If your factor is emailing the person who signed the contract rather than the person who processes payables, nothing happens until someone forwards it. Supplying a direct accounts payable contact with your first funding request avoids that detour.
Missing purchase order numbers are second. Many mid-sized and large customers will not confirm an invoice that does not carry a matching PO number, because their system cannot locate it. The invoice is not disputed; it is invisible.
Thin proof of delivery is third. A signed delivery ticket, a timesheet approved by a site supervisor, or a completion sign-off resolves a verification query in one exchange. A bare invoice with no supporting document invites a request for more.
Vendor portals are fourth. A growing number of large customers accept invoices only through their own portal, and a factor who does not have portal access has to wait for you to pull the status. Granting read access early is worth doing before you need it.
The fifth is genuinely outside your control: your customer’s own approval cycle. Some organisations batch invoice approvals weekly. No amount of preparation moves that.
| What you supply | Typical effect on verification |
| Direct accounts payable contact | Can materially reduce delay |
| PO number on the invoice | Prevents a common outright stall |
| Signed proof of delivery or sign-off | Often resolves queries in one exchange |
| Portal read access for your factor | Can reduce follow-up |
| Nothing beyond the invoice | Expect follow-up questions |
Why factors will not skip it
Verification exists because invoice fraud is a live and expensive problem, and because confirming an invoice up front is how a factor avoids advancing against a receivable that is invalid, disputed or fraudulent. What happens after the fact depends on your agreement, since recourse facilities can require you to repurchase or offset an unpaid invoice.
The scale of the underlying risk is not hypothetical. The FBI’s Internet Crime Complaint Center recorded more than one million complaints and $20.877 billion in reported losses in 2025, with business email compromise alone accounting for over $3 billion. Business email compromise frequently takes the form of a genuine invoice with altered remittance details, which is precisely the scenario an independent confirmation is designed to catch.
There is a practical consequence worth knowing. Because altered payment instructions are the classic fraud pattern, any mid-facility change to your remittance details will trigger extra scrutiny. If you change banks, expect the verification process to slow down for a cycle rather than speed up.
What verification does not mean
Two misreadings cause unnecessary worry.
A verification query is not a credit check on your customer. That happens separately, at onboarding, when the factor decides which of your customers it will fund and at what advance rate. A verification confirms a specific invoice; it does not reassess the relationship.
A failed verification is also not automatically a rejection. Most failures are administrative: a mismatched PO, a partial delivery, a duplicated invoice number. Imagine a supplier whose customer confirms only $8,200 of a $9,000 invoice because one line item shipped short. One possible outcome is funding against the confirmed portion while the remainder is resolved, though some factors will hold the entire invoice until it is settled.
For a wider view of how verification sits inside the setup process, see our breakdown of how long invoice factoring takes to set up.
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If you are still deciding whether factoring fits your receivables at all, our overview of invoice factoring for small business covers advance rates, fees, and how a facility is structured.
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Frequently asked questions
How long does invoice verification take? Usually a few hours to three business days. Invoices with a PO number, a direct accounts payable contact, and signed proof of delivery clear fastest.
Will my customer be annoyed by verification? Rarely. Accounts payable teams handle these confirmations routinely, and the questions are limited to whether the invoice is received, correct, accepted, and undisputed.
What happens if my customer does not respond? If direct customer confirmation is required and your customer does not respond, the advance may be held. Most factors follow up on a set schedule and will ask you to make contact. Persistent non-response may result in the invoice being held, that customer being funded at a lower advance rate, or that customer becoming ineligible.
Can a factoring company verify invoices without contacting my customer? Sometimes. Portal checks, delivery confirmations, and historical payment patterns can substitute on smaller invoices or long-standing accounts. Some factors require direct confirmation based on invoice size, customer or risk profile, so ask how yours decides.
Does a failed verification mean my invoice is rejected? Usually not. Most failures are administrative and get resolved, sometimes by funding a confirmed portion while a shortfall or duplicate is sorted out, though treatment varies by factor.
