Billing
Purchase Order: Meaning, Format and PO-to-Payment Process
What a purchase order is, what it should contain, how it becomes a binding contract, and how the PO, goods receipt and supplier bill are matched before you pay.
In short
A purchase order (PO) is the document a buyer sends a supplier to order goods or services at an agreed price, quantity and delivery date. Once the supplier accepts it, it is a binding contract. It is not a GST document and books nothing in your accounts; the purchase is recorded only when the supplier's bill arrives and is matched against the PO and the goods received.
- The buyer issues the purchase order; the supplier issues the invoice.
- An accepted PO is a contract: an offer by the buyer accepted by the supplier.
- A PO creates no GST liability, no input tax credit and no accounting entry.
- Three-way matching checks the PO, the goods receipt note (GRN) and the supplier's bill before payment.
- Give every PO a unique number and quote it on the GRN and the supplier's invoice, so the three can be matched.
What is a purchase order?
A purchase order (PO) is a document a buyer sends to a supplier to order goods or services. It states what is being bought, how much, at what price, when and where it should be delivered, and on what payment terms.
It turns an informal “send us 500 cartons” into a written order with a number both sides can refer to. That number then follows the purchase through the goods receipt, the supplier’s bill and the payment.
You can make one in a minute with the free purchase order generator.
Why businesses use purchase orders
- No dispute about what was ordered. The PO is the written record of quantity, price and specification.
- Control over spending. A purchase that has no approved PO behind it stands out.
- A contract once accepted. If the supplier accepts the PO, both sides are bound by its terms.
- Matching before payment. The PO is the first of the three documents you check before paying a bill.
What a purchase order should contain
There is no format prescribed by law. A complete PO has:
- The words “Purchase Order”, a PO number and the date.
- The buyer’s name, billing address and GSTIN.
- The supplier’s name, address and GSTIN.
- The delivery address, if different from the billing address.
- For each item: description, HSN code, quantity, unit and unit price.
- Discounts and the GST rate that will apply.
- Total value.
- Required delivery date.
- Payment terms — for example, 30 days from the invoice date.
- Terms and conditions: quality standards, penalties for late delivery, the right to reject defective goods.
- Authorised signature.
Ask the supplier to quote the PO number on their invoice. Without it, matching the bill to the order later is guesswork.
The purchase cycle, step by step
| Step | Document | Who issues it |
|---|---|---|
| 1 | Purchase requisition (internal) | Your store or department |
| 2 | Quotation | Supplier |
| 3 | Purchase order | Buyer |
| 4 | Order acceptance | Supplier |
| 5 | Delivery challan or tax invoice, with the goods | Supplier |
| 6 | Goods receipt note (GRN) | Your store |
| 7 | Purchase bill entered in your books | Buyer, from the supplier’s invoice |
| 8 | Payment | Buyer |
Small businesses often skip the requisition and the formal acceptance. The PO, GRN and bill are the three worth keeping.
Three-way matching
Before you pay a supplier, compare:
- The purchase order — what you ordered and at what price.
- The goods receipt note — what actually arrived, and in what condition.
- The supplier’s invoice — what you are being billed.
If the PO says 500 units at ₹40, the GRN says 480 arrived and 5 were damaged, and the invoice bills 500 units at ₹42, you have two problems to raise before paying: 25 units you did not receive in good condition, and a price you did not agree to.
This check is the main reason to use purchase orders at all. It catches over-billing, short supply and price creep before the money leaves.
Purchase order vs invoice
| Purchase order | Tax invoice | |
|---|---|---|
| Issued by | Buyer | Seller |
| Issued when | Before the supply | At the time of the supply |
| Records | What is ordered | What is sold and the GST charged |
| GST liability | None | Yes |
| Input tax credit | None | Yes, for the buyer |
| Accounting entry | None | Sale for the seller, purchase for the buyer |
GST and the purchase order
A purchase order is not a GST document. It does not create a tax liability for the supplier and you cannot claim input tax credit on it. Credit comes only from the supplier’s tax invoice, once it appears in your GSTR-2B.
It is still worth showing the GST rate on the PO. If the supplier later bills at a different rate, you notice before booking the bill, not when the credit fails to match.
Common mistakes
- No PO number on the supplier’s bill, so nobody can tell which order it belongs to.
- Booking the PO as a purchase. Nothing has been bought until the goods arrive and the bill is entered.
- Paying from the invoice alone, without checking what was received.
- Vague specifications — “steel sheets” instead of grade, thickness and size.
- No delivery date, which leaves you nothing to hold the supplier to.
How VyapRise handles purchase orders
In VyapRise, a purchase order is kept separate from the purchase bill. Raising a PO books nothing — no stock, no payable, no input tax credit. An order goes from open to approved; when the supplier’s invoice arrives, Create Bill makes the purchase bill from the approved order: the items and prices carry over, the order is marked completed, and only then are the stock, the supplier’s balance and the input tax credit recorded. Purchase orders are part of the Pro plan (a yearly plan) and open during the free trial; purchase bills are part of Pro too.
For a single PO without an account, use the free purchase order generator or create a purchase order online.
Frequently asked questions
Who issues a purchase order — the buyer or the seller?
The buyer. A purchase order is the buyer's formal order to a supplier. The seller's documents are the quotation before it and the tax invoice after the goods are supplied.
Is a purchase order legally binding?
Once the supplier accepts it — in writing, by email, or by starting to supply against it — the PO and the acceptance together form a contract under the Indian Contract Act. Before acceptance it is an offer the buyer can withdraw.
Is GST charged on a purchase order?
No. A PO records an order, not a supply, so no GST is due on it and no input tax credit can be claimed on it. It usually shows the GST rate that will apply, so both sides agree on the landed cost.
What is the difference between a purchase order and a purchase bill?
The purchase order is what you asked for. The purchase bill is the supplier's tax invoice for what they actually sent, entered in your books. The bill creates the payable and the input tax credit; the PO does neither.
What is three-way matching?
Before paying a supplier, you check three documents against each other: the purchase order (what was ordered and at what price), the goods receipt note (what actually arrived) and the supplier's invoice (what you are being billed). You pay only what all three agree on.