“No PO, no pay” is usually not a rejection of your work. It is a signal that the invoice cannot be matched to the buyer’s internal approval record. Before you send a B2B invoice, confirm the purchase order number, legal entity, billing mailbox, required attachments and the person who accepts the work.
This workflow is for freelancers, consultants and small agencies billing larger companies. A purchase order requirement varies by buyer and contract; never invent a PO number or assume a missing number can be fixed after submission.
What “no PO, no pay” actually means
Some organisations will not route an invoice for approval unless it references an approved purchase order. Others allow non-PO invoices but require a named budget owner or an exception form. The practical consequence is the same: an invoice can be correct, delivered and still sit outside the payment queue.
The University of California, Los Angeles invoice guidance documents missing or invalid PO numbers as a reason an invoice may be rejected. A supplier guide from Fidelity International likewise tells suppliers to quote the PO number on the invoice when a PO is required. Treat the buyer’s own supplier instructions as the controlling source.
Ask these questions before the work starts
Use this original pre-invoice checklist in the sales call, proposal or onboarding form:
| Question | Why it matters | Record it as |
|---|---|---|
| Does this client require a PO? | A valid invoice may still be blocked without one | PO required: yes/no |
| Who creates the PO? | The person approving the work may not issue it | Name and department |
| Which legal entity should be billed? | Group companies can have different addresses and VAT details | Exact bill-to entity |
| Where must the invoice be submitted? | AP portals and email inboxes often differ | Portal or mailbox |
| What must the invoice reference? | Buyers may require a project, cost centre or supplier ID | Required references |
| Who confirms delivery or acceptance? | Services may need an internal receipt before AP can approve | Approver and evidence |
Send the invoice only when you can answer each row. If the client says “just invoice me,” reply with one precise question: “Should I reference a PO, project code or approver on the invoice, and which mailbox or portal should receive it?”
Match the invoice to the buyer’s record
For goods, accounts payable may compare the purchase order, receiving record and invoice. For services, the buyer may use a simpler two-way match between the PO or contract and the invoice, plus confirmation that the work was accepted. The exact workflow belongs to the buyer, but your invoice should make the match easy.
At minimum, carry the same identifiers across the proposal, work record and invoice:
- PO number, if one exists
- project, engagement or contract reference
- service period or milestone date
- name of the internal requester
- your supplier or vendor ID, if provided
- exact legal names and billing addresses
Do not put confidential credentials, internal passwords or private client notes in a line description. Put only the reference an AP reviewer needs to identify the approved work.
What to do if the client says a PO is missing
Do not silently change the invoice to a guessed PO number. Ask the person who commissioned the work to confirm one of three paths:
- A PO exists: request the exact number and resubmit through the stated channel.
- A PO is not required: ask for written confirmation or the non-PO submission route.
- The work was urgent: ask who approves the exception and what reference AP wants instead.
Keep the original invoice number and label a corrected document according to the client’s process. If the buyer requires a replacement invoice, void or credit the original only in the way your accounting process and local rules allow. Do not create duplicate “new” invoices that could both be paid.
A practical B2B invoice submission record
For every larger client, keep one short record containing:
| Field | Example |
|---|---|
| Customer | Acme BV |
| Legal entity billed | Acme BV, Amsterdam |
| PO or exception | PO-10482 |
| Work accepted by | Project owner and email |
| Submission route | [email protected] or supplier portal |
| Required attachments | Invoice PDF, acceptance note |
| Terms | As agreed in PO or contract |
| Submitted | 17 September 2026, 10:14 CET |
| Next check | 24 September 2026 |
The date and next check are operational controls, not a promise that the buyer will pay on that date. If the invoice is returned, record the reason before resubmitting.
Create an invoice that is easy to approve
PayRequest invoicing gives you a customer-specific invoice with a professional PDF and an online payment route. Add the confirmed PO or project reference, the service period, clear line items and the correct billing entity before sending. The built-in payment link helps once the buyer has approved the invoice; it does not replace the buyer’s procurement rules.
For smaller clients without a procurement process, the same workflow stays lightweight: create the invoice, share it by email or link, and let the client pay online. PayRequest’s Free plan currently charges 2% per successful payment, capped at €25 per transaction; provider fees and the buyer’s own terms are separate.
Editorial note: AI assisted with this article and illustrative cover. The checklist and sample submission record are original planning tools. This article does not provide legal, tax or procurement advice; follow the client’s written supplier instructions and local requirements.
