Essential Purchase Order Checklist for Buyers

Purchase order checklist

A purchase order (PO) is the document in which a buyer asks a vendor for goods or services at a stated price. Use this checklist before you send a PO:

Section	Item	Notes
Header	Unique PO number	Never skip or reuse a number, also for a cancelled PO
Header	Date of issue
Header	Buyer’s legal name, address and contact person
Vendor	Vendor’s legal name, address and contact	Use the registered legal name, not a trade name only
Vendor	Vendor ID or tax ID from your vendor list
Reference	Quote number, contract number or project code	Connects the PO to the agreed price
Line items	Item number (vendor SKU, part number or your internal code)	One line for each item
Line items	Full description, quantity and unit of measure	For example “case of 10 reams”, not “paper”
Line items	Unit price and line total	Line total = quantity × unit price
Totals	Subtotal, shipping, tax and PO total	Make sure that the numbers add up
Terms	Payment terms and currency	For example Net 30
Terms	Shipping terms	Who pays freight and when ownership passes
Delivery	Ship-to address and contact at that address	Make sure that the address is current
Delivery	Required-by date	A date, not “as soon as possible”
Delivery	Delivery instructions	Dock, liftgate, signature, delivery hours
Internal	Budget code or cost center	If your accounting system needs it
Internal	Approver name and approval date	Follow your approval limits
Services	Rate, estimated hours, deliverables and a maximum amount	For a PO for services

When a purchase order becomes binding

A PO is an offer to buy. It becomes a contract when the vendor accepts it. In the US, the Uniform Commercial Code covers sales of goods. Under UCC section 2-206, a vendor can accept an order for prompt shipment in two ways. The vendor can promise to ship promptly, or it can ship the goods.

After acceptance, the PO is evidence of what both sides agreed. If the PO has the wrong address or no delivery date, you have less to point to in a dispute. Contract law differs between countries and for services. For a large or unusual order, ask your legal team which terms apply.

Payment terms

Write the payment terms on every PO. These are the usual forms:

• Net 30: the buyer pays the full amount within 30 days of the invoice date. Net 60 gives 60 days.
• 2/10 Net 30: the buyer can take a 2% discount for payment within 10 days. Otherwise, the full amount is due in 30 days.
• Due on receipt: the buyer pays when the invoice arrives.

Make sure that the terms on the PO are the same as the terms in the quote or the contract. If they are different, the invoice and the PO will not match, and the payment will wait.

Line items

The line items tell the vendor exactly what to ship. Make each description specific enough that a stranger can pick the correct item from a shelf. “Office supplies” is too vague. “Stapler, Swingline 747, black” is specific.

These are the details that prevent the wrong item:

• Brand, model or part number
• Size, color, grade or weight
• Unit of measure (each, box, case, pallet) and the number in each unit
• Required certifications or standards, if your industry needs them

For example, “copy paper” can arrive as the wrong weight. “Copy paper, 8.5 x 11, 24 lb, 10 reams per case” cannot.

Before you send the PO

1. Make sure that the budget is available and approved for this purchase.
2. Make sure that the approver has the authority for this amount under your approval limits.
3. Compare the vendor’s legal name, address and tax ID with your vendor list.
4. If the vendor’s address or bank details changed by email, call the vendor at a number that you already have.
5. Open the quote or the contract. Make sure that each unit price on the PO agrees with it.
6. If the quote has expired, get a new price from the vendor before you send the PO.
7. Multiply quantity by unit price for each line. Make sure that the line totals, shipping and tax add up to the PO total.
8. Make sure that the ship-to address is current and that the required-by date is realistic.
9. Add the delivery instructions, for example dock delivery, liftgate or signature.

Common purchase order errors

Error	Result	Prevention
Vague description	The vendor ships an item that matches the words but not your need	Add brand, model, size and unit
Old ship-to address	Goods go to a closed site or to the wrong site	Make sure that the address is current on every PO
Expired quote	The vendor invoices at a higher price	Get a new price before you send
No required-by date	The vendor ships when it is convenient for the vendor	Always add a date
Decimal error in a line total	The invoice does not match the PO, and payment waits	Recalculate each line
Vendor with a similar name	The PO and the payment go to the wrong company	Match the tax ID with your vendor list
Blanket PO with no release schedule	The vendor ships everything at once	Attach the delivery schedule
Service PO with only a maximum amount	The vendor bills hours up to the maximum but delivers less work	Add rates, deliverables and milestones

Purchase order types

Type	Use it for	What it must also show
Standard	One purchase with a known item, quantity and date	The full checklist above
Blanket	Repeated purchases from one vendor over a period, up to a maximum amount	The period, the maximum amount, how you release orders and the invoice schedule
Contract	Orders under a contract that sets prices and terms	A reference to the contract, plus quantity, date and ship-to address for this order
Planned	Large items with staged deliveries or staged payments	Each delivery date and the payment for each milestone

Changes after you send a PO

If you must change a PO after you send it, issue a revision of the same PO. For example, change PO-1001 to PO-1001 Rev A. Do not issue a new PO number. Write down what changed and when. Get the vendor’s acceptance of the revision. Then receiving and accounts payable know which version is current.

Use this checklist with Claude or ChatGPT

Claude or ChatGPT can do a first pass on a PO draft. Paste the checklist into the chat. Then paste or attach the PO and, if you have it, the vendor’s quote. Ask the AI to compare them:

Below is my purchase order checklist, a draft PO and the vendor's quote.
Go through the checklist item by item and say whether the PO has it.
Compare every unit price, quantity and term on the PO with the quote.
Recalculate each line total and the PO total. List every missing
item and every difference.

Do not send the PO based on the AI answer alone. The AI can make arithmetic errors or report a difference that is not there. Recalculate the totals yourself and find each reported problem in the documents. Remove bank details and personal data that the AI does not need before you upload. Make sure that your company permits you to share vendor prices with an AI tool.

A docs portal with Ask AI
and support tickets

Connect a repository, or describe your product to start. Each docs site has search, Ask AI, an API console, an MCP server and support tickets.

• Publishes from GitHub on every push
• Works with Mintlify repositories
• API console from your OpenAPI file
• MCP server and llms.txt for AI agents
• Ask AI and support tickets
• Analytics for people and AI agents

Start Free→ Questions? Ask AI in our docs

No card required.