What is a purchase order? How it relates to a quote

What a purchase order is, and why both sides care

For the buyer, a PO is an internal control and a commitment. It records that someone with authority approved the spend, it tells the supplier exactly what to deliver, and it gives accounts payable a document to match against the delivery and the invoice later.

For the seller, a PO is the signal that the customer has said yes. It turns your quote into an order: stock is allocated, a sales order is created in your system, the goods are picked and shipped. If the PO says something different from the quote, you now have a problem to solve before you ship, not after.

Terminology varies. In the United States and Canada, “purchase order” and “PO” are universal. In the UK and Ireland you will also hear simply “an order” or “an order number”, particularly from trade customers. In some industries a PO number is simply the reference a customer needs on your invoice so their own system can pay it.

What a purchase order contains

There is no single legal format, but a usable PO carries the same information almost everywhere. For each field, here is what the buyer enters and what a careful distributor checks.

Types of purchase order

• Standard purchase order: a one-off order for specific items, quantities and prices. This is what most trade counters receive.
• Blanket purchase order: an agreement to buy up to a total value or quantity from you over a period, for example a year, with separate “releases” for each delivery. The prices are fixed once and each release refers to the blanket PO.
• Contract or scheduled purchase order: an order that sits under a framework agreement or lists planned deliveries over time.

Names differ between purchasing systems, so ask a customer what it means by its own term. What matters to you is whether the quantity, price and dates are final for each shipment, or whether the PO is a ceiling that releases draw against.

Purchase order vs quote vs invoice

These documents are easy to confuse because they carry the same line items. They differ in who writes them, when and what they commit anyone to.

The quote and the PO are a pair: the quote is your offer, the PO is the buyer’s acceptance. The invoice is the third step and should reflect the PO and the delivery, not the original quote. When all three agree, accounts payable at the customer can pay without a query. When they do not, payment waits.

How a purchase order moves from quote to payment

1. The customer asks for prices and you send a quote with a number and a validity date.
2. The customer’s purchaser raises a PO, referencing your quote.
3. You receive the PO by email, EDI, a portal, a PDF, a spreadsheet or even a photo, and check it against the quote.
4. You confirm with an order acknowledgement and create the sales order.
5. You pick and ship the goods, with a delivery note that cites the PO number.
6. The customer records the receipt, and its system matches the PO, the receipt and your invoice.
7. You invoice, quoting the PO number, and the customer pays under the agreed terms.

The matching in step six is often called a three-way match: the PO, the proof of receipt and the invoice must agree on items, quantities and prices. If your invoice differs from the PO in any of those, the customer’s payables team will stop and ask why.

Checking an incoming PO against your quote

Before you accept a PO, read it against the quote line by line. The goal is not to catch the customer out; it is to make sure you and the buyer mean the same thing before the truck leaves. Here is a typical check on a plumbing order.

Three outcomes are possible for a line like the elbows: the buyer made a mistake and corrects the PO, you agree to the lower price as a one-off and note it, or the quote had expired and the buyer used an older price list. Whichever it is, resolve it in writing before shipping, and cite the PO number.

Common purchase order problems

• Price differences between the PO and the quote, usually from an expired quote or a different customer tier.
• Part numbers that are not yours: the customer’s own item code, a competitor’s number or a description with no code.
• Unit-of-measure mismatches such as “each” against “per 100”, or feet against coils.
• Quantities that ignore pack sizes or minimum order quantities.
• Ship-to addresses that differ from the account’s usual delivery address.
• Delivery dates earlier than the lead time you quoted.
• No PO number on the delivery note or invoice, which delays payment.
• Accepting verbally and shipping before the discrepancy is resolved.

Checklist for a PO you have just received

• Is it addressed to the right company and account, and does it carry a PO number?
• Does it cite your quote, and is that quote still valid?
• Does every line map to one of your products, in the right unit and quantity?
• Do the unit prices equal the quote or the customer’s price tier?
• Are freight, taxes and payment terms the ones you agreed?
• Can you meet the delivery date for every line, or have you proposed a revised date?
• Has the sales order been created with the PO number on it?

How software can take the retyping out of purchase orders

Re-keying customer POs is slow because they arrive in so many forms, and every customer uses its own item codes and wording. The work is the same each time: read the lines, find your product, apply the customer’s price, check the result against the quote.

Qotora AI reads a customer’s request or PO as it arrives, whether that is a PDF, an Excel file, an email, a photo or a text message. It finds each line in your own catalogue, applies your price rules and the customer’s tier, and, when a line is unclear, asks a precise question instead of substituting. The result is a quote that a member of your team reviews and approves before anything leaves. Every price traces back to your own data, so you stay in control of what is offered.