What Is a Purchase Order and Why Small Businesses Should Use Them
Skip ahead: create a professional purchase order in minutes
Create Free Purchase OrderA purchase order is a document a buyer sends to a vendor before an order ships, spelling out the items, quantities, agreed price, and delivery date so both sides have something in writing to check the eventual invoice against. Small businesses benefit from them just as much as large companies do, since without one, a vendor invoice with a different price or quantity than what was agreed becomes your word against theirs. A PO is worth issuing for recurring vendors and any order where price needs to be locked in ahead of time.
Key takeaways
- A purchase order (PO) is issued by a buyer to a vendor, confirming exactly what's being ordered and at what price, before any invoice is sent.
- A PO number gives both sides a single reference to match against the eventual invoice and delivery.
- Small businesses that skip POs often end up disputing prices or quantities after the fact. A PO settles that before the order ships.
- A purchase order and an invoice are opposite ends of the same transaction: the PO requests goods, the invoice bills for them.
What a Purchase Order Is For
A purchase order is a document a buyer sends to a vendor, listing exactly what they're ordering, the quantity, the agreed price, and when they need it delivered. It's issued before the vendor invoices for the order, and it becomes the reference both sides check the final invoice against.
Purchase Order vs Invoice
| Purchase order | Invoice | |
|---|---|---|
| Sent by | The buyer | The vendor |
| Sent when | Before the order is fulfilled | After the order is delivered |
| Purpose | Confirms what's being ordered | Requests payment for what was delivered |
Why a Small Business Would Bother With One
Purchase orders feel like corporate paperwork, but the underlying problem they solve applies to a two-person business just as much as a large one: without something in writing, a vendor invoice showing a different price or quantity than what you agreed on is your word against theirs.
- Price protection: the PO locks in the price agreed at order time, before any supplier increase.
- Budget tracking: a running list of open POs shows what's already committed, before the invoices land.
- Fewer disputes: a mismatched invoice is easy to spot against a PO you already have on file.
When to Skip One
For a one-off, low-value purchase from a supplier you deal with regularly, a PO can be overkill. It earns its keep for recurring vendor relationships, larger orders, or any purchase where price and quantity need to be locked in writing before goods ship.
A free purchase order generator that auto-numbers each PO makes it just as fast to issue one as it would be to skip it, so there's less reason to leave a real order unrecorded.
Frequently asked questions
Do freelancers and small businesses really need purchase orders?
For recurring supplier relationships or larger orders, yes: it prevents price and quantity disputes that are otherwise your word against the vendor's.
Is a purchase order legally binding?
Once a vendor accepts it, a PO generally functions as a binding agreement on the price and quantity stated, similar to any other written contract.
What's the difference between a PO and a quote?
A quote is the vendor's proposed price before you've committed. A purchase order is the buyer's formal confirmation to proceed at that price.
Can a purchase order be changed after it's sent?
Only with the vendor's agreement: treat a sent PO the same way you'd treat a sent invoice, and issue a revised PO rather than editing the original.
Try Our Free Purchase Order Generator
Create a professional purchase order for your vendors with delivery dates.
Free forever · No sign-up · Takes 2 minutes