You've received a verbal or email go-ahead from the client, but your accounting system is asking for a Purchase Order (PO) number before you can invoice or ship the order. It's a small piece of data, but it can be the single biggest bottleneck in your billing process. Asking a client to confirm a purchase order number is a straightforward request, but it can feel awkward—you don't want to seem pushy or suggest you don't trust them. The key is to position it as a routine, necessary step to ensure accurate billing and smooth processing on both sides. This guide provides a clear, step-by-step process, professional templates, and practical tips to help you request PO confirmation politely and efficiently.
Why Confirming a PO Number Is a Critical Step in Your Billing Workflow
A PO number isn't just a reference; it's the financial skeleton key that unlocks your client's internal approval system. Many large organizations require a valid PO number on every invoice to process payments. Without it, your invoice could be rejected or indefinitely delayed, causing cash flow problems for you and frustration for everyone. Confirming the PO number upfront—and getting it in writing—ensures your invoice will be routed to the correct department and approved quickly. It also protects you from disputes later, as the PO number serves as a clear link between your work and the client's purchase authorization.
Common Mistakes That Delay Your PO Confirmation Request
Even a simple request can go sideways if you fall into these common traps. Avoiding them ensures your email is effective and client-friendly.
- Being too vague: "Can you send me the PO?" is too open-ended. Specify what you need: the PO number, the issuer's name, and the date it was issued.
- Failing to explain why you need it: Clients often don't realize that a PO is essential for your invoicing process. Briefly explain that it's required for payment processing.
- Not including a deadline: Without a timeline, your request can linger. State clearly when you need the PO to keep the project on schedule.
- Assuming the PO is on file: Never assume the client has provided a PO number in the past. Always ask for confirmation for each new project or purchase.
- Using unprofessional language: "I need your PO number" sounds demanding. Instead, say "Could you please confirm your PO number for our records?"
Send Your PO Confirmation Request at the Optimal Time
When you send your request can significantly impact how quickly you get a response. The best moment is immediately after the client has given you a verbal or email approval to proceed—ideally, before you start the work or fulfill the order. This way, the PO request feels like a natural part of the project kickoff, not a last-minute hurdle.
If you're already in the middle of a project, send the request at least 10 business days before the invoice is due. This gives the client time to locate or generate the PO number. Avoid sending the request on a Friday afternoon or during a major holiday. Mid-week, mid-morning (Tuesday or Wednesday, 10–11 AM) is generally best.
Professional Email Templates for Every Client Relationship
Below are three distinct templates—each suited for different client dynamics and levels of formality. All include subject line options and placeholders for easy personalization.
Template 1: Standard and Professional (Best for Most Clients)
Subject Line Options:
- Action Required: Confirm Your Purchase Order Number
- PO Number Needed for Invoice [Invoice #]
- Please Confirm Your PO Number – [Project Name]
Dear [Client Name],
I hope you're having a productive week. As we prepare to invoice for [Project/Order Name], we kindly ask that you confirm the Purchase Order (PO) number associated with this work.
Your PO number is required for our accounting team to process the invoice correctly and ensure timely payment. Please reply to this email with the PO number, or attach a copy of the PO document if you have it.
If a PO is not required for this project, please let us know so we can note that in our records.
We would appreciate receiving this information by [Date, e.g., in 3 business days] to avoid any delays in billing.
Thank you for your cooperation.
Best regards,
[Your Full Name]
[Your Title]
[Your Company]
[Your Phone Number]Template 2: Warm and Collaborative (Best for Long-Term Clients)
Subject Line Options:
- Quick Question – PO Number for [Project Name]
- Help Us Get This Invoiced – PO Request
- Your PO Number – Quick Confirmation
Hi [Client Name],
I hope you're doing well. We're wrapping up the first phase of [Project Name] and getting ready to invoice. To ensure everything flows smoothly, could you please confirm your Purchase Order number for this work?
We just need the PO reference number, and we'll take care of the rest. If you don't have a PO system, no problem—just let me know and we'll proceed with our standard invoice.
If you could reply by [Date], that would be perfect. Thanks in advance for your help!
Best,
[Your Full Name]
[Your Title]Template 3: Brief and Direct (Best for Follow-Up or Urgent Requests)
Subject Line Options:
- Urgent: PO Number Needed
- PO Confirmation – [Order/Project]
- Re: Invoice – Please Confirm PO
Hi [Client Name],
I'm following up on our need for a Purchase Order number for [Project/Order]. Our billing team is ready to issue the invoice, but we need the PO before we can finalize it.
Could you please reply with the PO number by [Date/Time]? If you don't have one, just let me know.
Thanks for your quick action on this.
Best,
[Your Full Name]Best Practices for a Smooth PO Confirmation Process
Follow these tips to ensure your request is answered quickly and accurately.
- Be specific: Ask for the PO number, the date it was issued, and the name of the person who issued it. This helps you validate the number if needed.
- Offer to help: If the client says they can't find the PO, offer to help by checking with their procurement department or your mutual contact.
- Document the PO: Once you receive it, save it in a secure, searchable location (like your CRM or project folder) with the client's name and project details.
- Send a confirmation: After receiving the PO, send a brief thank-you email: "Thank you for confirming the PO. We've updated our records and will include it on the invoice."
- Handle exceptions gracefully: If the client says a PO is not required, ask if they'd like a "no-PO" letter or confirmation email for your records, and proceed accordingly.
What to Do If the Client Doesn't Respond to Your Request
Sometimes, even a polite and well-timed email may not get a reply. Here's a professional follow-up plan to keep the process moving without being a nuisance.
First, wait 2–3 business days and send a gentle reminder (use Template 3). Keep the tone friendly: "I'm checking in on the PO number request—I know you're busy, but any help would be appreciated."
Second, if you still don't hear back, try a different channel. A brief phone call or a message through a shared platform (Slack, Teams, etc.) can often get a faster response.
Third, if the client is unresponsive, consider escalating internally. Ask your main contact if they can forward your request to someone else in their organization, or if they can confirm that a PO isn't required. Sometimes, the issue is a simple forwarding mishap.
Finally, if you never receive a PO, you have a choice: proceed with invoicing without one (and note that you requested it), or pause the project until you receive the PO. The right choice depends on your relationship and the client's payment history. In most cases, it's better to be firm but polite—your cash flow depends on it.
Frequently Asked Questions
Q: What if the client says they don't have a PO number and don't need one?
A: That's perfectly fine—some organizations don't use PO systems. Ask them to confirm this in writing (a simple email reply is sufficient). Note this in your records, and proceed with your standard invoicing process.
Q: Should I ask for the PO number before or after the work is done?
A: Ideally, before you start the work. This ensures that the purchase is officially authorized and that you're aligned with the client's billing requirements. If you're already finished, ask as soon as possible.
Q: What if the client gives me a PO number that doesn't match my invoice format?
A: Use the PO number exactly as given. Your invoice system may require it in a specific field. If you can't fit it, ask the client if they prefer a different format or if they can provide a reference number that works with your system.
Q: Can I send the invoice without the PO if the client hasn't confirmed it?
A: You can, but it may delay payment. Many organizations reject invoices without a valid PO. It's safer to wait until you have the PO, or at least a written statement from the client that a PO is not required.
Q: How should I store the PO number for future reference?
A: Save it in your accounting system, CRM, or project management tool. Tag it with the client's name, project ID, and the date. This will save you from asking for it again on future projects.