What should I check before paying an unexpected invoice?

Before paying an unexpected business invoice, establish who is asking, what was authorized, what was supplied and what remains owed. Match the demand to independent business records and the actual terms. Keep unsupported items on hold through the appropriate process while protecting legitimate payment obligations.

A familiar logo and a plausible amount can make a bill easy to wave through. An unfamiliar invoice can also be a genuine purchase made by a colleague. The useful response is a supported check, not automatic payment or an accusation based on appearance.

Establish the asserted obligation

Identify the named supplier, customer entity, invoice reference, description, period, amount and requested payment date. Find the order, agreement or other basis the bill claims. Ask which authorized person accepted the relevant purchase.

Search the established records for prior payments, credits, deposits and related invoices. A copy, reminder or new-looking document can refer to an obligation already settled. Keep the original references so repeated amounts do not become guesswork.

The FTC's small-business scam guide describes phony invoices designed to look like ordinary purchases and recommends clear approval procedures and close invoice checks. It also warns about pressure and impersonation. Those warning signs justify care; they do not identify every unfamiliar sender as a scammer.

For a new or unexpected message, use appropriate secure handling. Do not open an unfamiliar attachment, follow a payment link or supply sensitive information simply to investigate the demand. Verify through established systems and contact routes suitable to the situation.

Match the order, receipt and bill

Recover what the business actually agreed to buy, the quantity and condition received, and the basis for the invoice. A purchase approval, a delivery and a payment demand answer different questions.

The terms may permit deposits, milestones, partial shipments or another arrangement. Use those actual terms rather than imposing a universal rule that nothing can ever be billed before delivery. Identify the event that makes this particular amount payable.

Check changes too. An approved larger quantity or added service may explain a different amount. An unapproved request does not become an accepted change simply because it appears on an invoice.

The purchase-order guide examines alignment before work begins. This check happens on the paying side, when a demand arrives and the business needs to establish the supported current obligation.

Work through an original quantity case

Consider a fictional workshop with an accepted order for sixty storage dividers at $20 each, plus a single $80 delivery charge. The order total is $1,280. Under the supplied agreement, the supplier may bill delivered accepted units plus that one delivery charge; the undelivered balance is not yet billable.

Fifty conforming units arrive and are accepted. Ten remain backordered. The receiving record identifies the actual quantity, order and date. No other goods, taxes, fees, deposits, credits or prior payments apply in this limited case.

An invoice then lists eighty units at $20 plus the $80 delivery charge, totaling $1,680. It names the familiar supplier and references the correct order. Nevertheless, eighty is twenty above the authorized sixty and thirty above the fifty received.

The amount supported for the current delivery is $1,080: fifty times $20, plus $80. The remaining ten units have a $200 item value and are still unbilled under the supplied terms. The future balance does not justify billing another thirty units now.

Scroll horizontally if needed. Authorization, receipt and invoicing quantities are compared separately.

The current invoice exceeds the supported amount by $600. That discrepancy is not proof of fraud. It could reflect an error, another order incorrectly included or a demand that needs further investigation. Record the fact and recover the explanation.

Resolve the specific mismatch

The workshop checks its own order and receiving evidence, then raises the quantity discrepancy through the supplier's established finance route. In a completed fictional branch, the supplier confirms a quantity-entry mistake and issues the appropriate correction to $1,080.

Keep the original demand, explanation and corrected record connected. Confirm which reference now applies and how the earlier version is marked in the accounting process. Do not leave two apparently payable bills in the queue.

If the supplier instead identifies another approved delivery, verify that actual record. If the explanation remains unsupported, preserve the disputed item and follow the real contractual process. An internal label cannot decide a genuine legal dispute.

The supplier's identity and invoice content are separate checks. A valid supplier can make an error; an apparently correct invoice can come through an unauthorized channel. Resolve the relevant questions without treating one favorable answer as proof of everything else.

Keep an unrelated demand separate

During the same fictional review, a different sender demands $295 for an annual directory listing. The invoice claims a renewal, but the workshop's current records contain no matching agreement or prior listing payment. No authorized colleague has yet confirmed accepting it.

That is an unsupported demand at this stage, not a verified renewal and not yet an established finding about the sender's intent. The reviewer checks the actual purchasing records and relevant authorized people without using the invoice's payment link as a verification route.

Keep the $295 outside the approved payment batch unless the actual obligation and required authorization are established. Do not combine it with the legitimate supplier's corrected $1,080 simply because both documents arrived together.

If a real earlier agreement is recovered, examine its terms, scope and renewal status. If the demand is shown to be fraudulent, preserve the relevant evidence and use appropriate reporting and security processes.

Check the cash consequence

The fictional workshop has $2,600 available for this limited payment sequence. Two paid review hours at an all-in $36 cost $72, leaving $2,528. The hours cover document retrieval, checking, resolution and the payment record, with no free owner administration assumed.

Paying the supported corrected invoice of $1,080 leaves $1,448. A separate legitimate $1,000 obligation falls due next and is funded, leaving $448. Other business and household needs are protected outside the case.

In a different branch, paying the original $1,680 and the unsupported $295 before checking would use $1,975. After the same $72 administration, cash would be $553. The later $1,000 legitimate obligation would then have a $447 funding gap.

The additional $895 consists of the $600 invoice overstatement and the $295 unsupported demand. It would turn the supported branch's $448 remaining cash into a $447 shortfall. These are conditional arithmetic comparisons, not an observed loss, measured fraud-prevention return or guarantee that the checking process saves money in every case.

The check also does not authorize indefinite delay of a legitimate bill. The corrected supplier payment still needs its normal approval and execution by the actual agreed date. Protecting against an unsupported payment and honoring a supported obligation belong in the same process.

Check payment identity separately

Once the obligation is supported, confirm the existing payment process and authority. If bank details have changed, follow the payment-destination verification guide. This invoice review does not replace that independent check.

A manager's approval of the amount is not necessarily permission to change supplier details or release money. State what each approval covers and which action remains. People should not have to infer new authority from a general instruction to get the bills paid.

Retain the actual payment confirmation and match it to the approved obligation. A prepared batch, scheduled transfer and completed bank movement may be different states. Update the outstanding balance using evidence rather than a recollection that somebody dealt with it.

If a duplicate bill arrives afterward, trace it to the existing payment before taking another action. A changed invoice date or format does not automatically create a second purchase. Equally, identical amounts do not prove duplication without the underlying references.

A genuine purchase may have no formal purchase-order number if the business's actual process uses another authorized agreement. Recover that evidence rather than rejecting the bill solely because it lacks a field your company never required. Conversely, a convincing number printed on the invoice does not establish that the corresponding order exists.

Keep later approval distinguishable from original authorization. A manager might decide how to resolve an unauthorized but useful purchase, but that decision should not be rewritten as evidence that permission existed before the order. Record what happened and the actual resolution under the business's applicable terms.

Give staff a usable exception route

Name someone who can handle an unsupported invoice, disputed receipt, absent approver or approaching due date. Provide a clear way to escalate without forcing the person in the payment role to invent a decision.

Encourage specific descriptions: quantity differs from receipt, agreement not located, payment already recorded, sender identity unresolved. Those statements are more useful and fairer than a vague label such as looks dodgy.

Preserve the original evidence appropriately and protect sensitive supplier and customer details. If there is a suspected security incident, involve the people responsible for that process. Do not improvise a personal investigation or circulate accusations to unrelated colleagues.

Then improve the recurring process where needed. If genuine invoices repeatedly lack references, agree a clearer receiving and billing arrangement. If staff cannot find approved purchases, fix the records. A good check should make ordinary valid payments easier to support, not turn every supplier interaction into a confrontation.

Keep the invoice checklist

1. Identify the supplier, claimed purchase, amount and payment date.
2. Find the actual agreement, authorization and evidence of the billable event.
3. Reconcile quantities, charges, prior payments and credits.
4. Investigate discrepancies through appropriate established routes.
5. Separate supported obligations from unresolved or unrelated demands.
6. Verify payment details and authority through their own process.
7. Retain the correction and actual payment record without paying twice.