Inside the payment process: what happens on both sides of an invoice

QUESTION 01

What happens inside a customer’s company after I send an invoice?

An invoice may pass through intake, supplier and purchasing checks, confirmation that the work was accepted, approval, payment scheduling and bank processing. A small customer may combine these responsibilities; a larger buyer may divide them across several teams. “Sent” proves only that your business attempted submission. It does not establish that the buyer accepted the document into its payment workflow.

Ask for the submission reference, current stage, remaining requirement and responsible person. UCLA’s published process, for example, can reject an invoice before it enters the approval system at all. Use that example to ask better questions, not to infer your client’s process. Your own billing owner should retain the agreement, invoice version, delivery evidence and correspondence so each request can be answered without restarting the investigation.

Subject: Processing status for invoice [number]

Hi [name],

We submitted invoice [number], [currency and amount], on [date] through [agreed channel]. Its stated due date is [date].

Could you confirm:
1. Has it been accepted into your invoice system, and what is the reference?
2. Is anything missing or disputed?
3. Which approval or payment step remains, and who owns it?
4. What payment initiation and expected receipt dates can you confirm?

Please let us know the next action and owner by [date]. We can provide [relevant evidence] if needed.

Thank you,
[name and business]

QUESTION 02

Why can accounts payable say they cannot approve my invoice?

Accounts payable may check invoice information and process an approved payment without having authority to accept the work, create a PO or increase a project budget. The project owner may need to confirm delivery; procurement may need to correct purchasing authorization; a finance approver may need to release the payment. Repeating the same demand to AP cannot complete an action that belongs to another person.

Ask AP to identify the missing action and the relevant role, then involve your client sponsor to find the named owner. Keep AP in the loop with the resulting approval or corrected record. UCLA explicitly directs suppliers with missing purchase orders to the customer who placed the order. Other buyers differ, so confirm your account’s responsibility map rather than treating an AP employee’s inability to authorize something as unwillingness to help.

QUESTION 03

What is invoice matching, and why can a purchase order block payment?

Matching checks whether an invoice agrees with the buyer’s purchasing and, where required, delivery or acceptance records. The invoice might refer to a closed PO, exceed the approved amount, identify the wrong entity or omit the relevant service line. A PO number is a reference to authorization; merely adding any number will not resolve an underlying mismatch.

Request the exact failed check and compare the agreed scope, amount, currency, dates and purchasing reference. If extra work exceeded authorization, involve the commercial owner to resolve it. If the invoice is wrong, use your normal correction process and retain the original history. Do not invent a number, backdate approval or split an invoice to bypass a control. An administrative rejection and the contractual question of what is due are separate matters.

Resolve a missing or invalid PO ↗

QUESTION 04

Why does the client still need approval when we already delivered the work?

Delivery and contractual acceptance can be different events. A service agreement might require approved timesheets, a milestone sign-off or evidence that stated acceptance criteria were met. The buyer’s internal process may also require the project owner to record that acceptance. Conversely, an internal approval delay does not automatically change the payment obligation you agreed with the customer.

Find the precise billing trigger and acceptance procedure in the contract, then gather the relevant evidence. Ask the authorized client contact to identify any unmet criterion or record the approval. Avoid sending AP a large archive without explaining which document answers the outstanding question. For future work, agree the approver, evidence format, review period and route for a disputed deliverable before starting; have material acceptance clauses reviewed for the relevant legal context.

QUESTION 05

Can incomplete supplier onboarding stop an otherwise correct invoice?

Yes, in a buyer process that requires an active supplier record before accepting or paying an invoice. The client may need the correct supplier legal entity, tax information, bank verification or onboarding approval. UCLA lists incomplete vendor registration as a reason for rejecting a submission before its approval workflow. That explains a possible processing blocker; it does not determine the legal payment deadline in every transaction.

Ask which registration item is missing, who can approve it and how completion will be confirmed. Use the verified onboarding channel and provide only the information reasonably required. Check that the invoicing entity and approved supplier record agree. Preserve the original invoice and submission dates, then confirm the corrected submission was accepted. Do not repeatedly send the same document while an unresolved supplier setup problem remains.

QUESTION 06

Why is an approved invoice still unpaid?

Approval may mean the invoice is eligible for payment, not that money has been issued or received. It can still be waiting for the due date, a payment run, a release authorization or bank processing. UCLA’s published statuses illustrate the distinction: “Payable” means an approved invoice has reached its payment system, while “Paid” means payment has been issued. Those labels and timelines are specific to that buyer.

Ask what “approved” means in this account, whether any payment hold remains, and the confirmed payment initiation date. Request the payment reference once issued, then reconcile it to your bank receipt. Record the original contractual due date separately from the latest forecast. A processing estimate can help plan cash, but it should not silently replace the agreement or be treated as settled money.

QUESTION 07

What should I ask when the client says we missed the payment run?

Ask which deadline was missed, why the invoice was excluded and the next available payment date. “Payment run” can describe a buyer’s scheduled batch of payments, but not every business uses one. Confirm whether the invoice is fully approved for the next run or whether an unresolved issue will exclude it again. Ask who can authorize an earlier exception if the agreed due date has passed.

Keep the explanation and commitment in writing, including initiation and expected receipt dates. Use the information to improve future submission timing while retaining the original contract terms. The Small Business Commissioner recommends confirming when funds should reach your account, rather than relying on ambiguous terms. A buyer’s internal calendar can explain a delay; it does not, by itself, establish that the supplier agreed to extend credit.

QUESTION 08

How can a profitable customer still struggle to pay an invoice?

The cited cash-buffer evidence is historical and US-specific; the response to a payment proposal depends on the account and applicable law.

Profit and available cash measure different things. A customer can earn accounting profit while cash is tied up in its own receivables, inventory or investments, or needed for payroll and other obligations. This is one possible explanation for a delay, not a diagnosis of your customer’s finances. Do not infer insolvency or deliberate withholding from an unanswered email.

For historical context, a JPMorgan Chase Institute report published in 2016 found a median cash buffer of 27 days in its sample of 597,000 selected US small-business banking customers, using February–October 2015 activity. That is not a current worldwide benchmark or a study proving why your client paid late. If the client reports a cash constraint, ask an authorized decision-maker for a specific, realistic proposal and assess its effect on your own cash forecast before accepting revised terms.

Model delayed receipts in a 13-week cash forecast ↗

QUESTION 09

Why can an invoice be rejected as a duplicate when we still have not been paid?

A duplicate flag may refer to an earlier submission of the same invoice, not a second payment already received. The earlier record may still be processing, or payment may have been issued under another reference. UCLA’s rejection guidance includes invoices paid under a different submission, illustrating why the rejection message alone cannot explain your bank position. Ask AP to identify the original payable record and its status.

Compare the invoice number, amount, buyer entity, submission history and any payment reference, then reconcile against actual receipts. If the original record is valid, follow that record instead of creating another invoice to bypass the duplicate check. If the match is wrong, ask the buyer to investigate and preserve the explanation. Your own ledger should show one receivable for the same charge, with replacement documents and credits linked through the approved accounting process.

QUESTION 10

What should our team record so sales and finance do not send conflicting chases?

Maintain one account record with the open balance, original due date, last verified status, client explanation, next action, responsible person and review date. Separate a customer’s promise from evidence that an approval or payment actually happened. Sales may know the relationship context, delivery may hold acceptance evidence, and finance may know the bank position; a useful record brings those facts together without requiring everyone to contact the client.

Name one person to coordinate external follow-ups and another authorized decision-maker for concessions, if needed. Log pauses and their reasons so an automatic sequence does not continue during a dispute or payment trace. This is a recommended operating practice, not a universal organizational model. The goal is an accurate shared view: a colleague taking over tomorrow should know what changed, what remains uncertain and who is expected to act next.

Invoice and customer legal entity:
Currency and current open balance:
Original due date:
Submission reference and accepted date:
Latest verified stage and supporting evidence:
Client’s explanation, recorded without interpretation:
Work or invoice issue requiring resolution:
Client action owner:
Our coordinating owner:
Promised payment initiation date:
Expected bank receipt date:
Next action and review date:
Reminder pause, reason and review date:
Who may approve changed terms or credits:

Build an agency receivables workflow ↗