In this article
When your business buys goods or services — raw materials, stock, office equipment, a printing job — misunderstandings are expensive. Wrong quantities, different prices on the invoice, late deliveries, “we never agreed to that”. A purchase order (PO) prevents most of these problems by putting the order in writing before anything is delivered.
What is a purchase order?
A purchase order is a document the buyer sends to a supplier to officially place an order. It states exactly what is being bought, how many, at what price, and on what terms. When the supplier accepts it, both sides have a clear, shared record of the deal.
What a PO should include
- PO number — unique, so everyone can refer to it (e.g. PO-2026-0042)
- Date of the order
- Buyer details — company name, address, GSTIN, contact person
- Vendor details — supplier’s name, address, GSTIN
- Ship-to address, if different from the buyer’s office
- Item table — description, quantity, unit, rate, tax and amount
- Delivery date or schedule
- Payment terms — e.g. 30 days from invoice, 50% advance
- Other terms — quality, inspection, warranty, penalties for delays
- Authorised signature
Where a PO fits in the buying process
| Step | Document | Who sends it |
|---|---|---|
| 1. Ask for prices | Request for quotation (RFQ) | Buyer |
| 2. Offer prices | Quotation | Supplier |
| 3. Place the order | Purchase order | Buyer |
| 4. Deliver | Delivery challan / note | Supplier |
| 5. Request payment | Invoice | Supplier |
| 6. Pay | Payment | Buyer |
Why businesses use POs
1. Fewer disputes
Price, quantity, delivery date and terms are agreed in writing before goods arrive.
2. Budget control
Requiring a PO for purchases means someone approves spending before it happens, not after.
3. Easier accounting
Every invoice can be traced back to an approved PO, which helps with audits, GST input credit checks and tracking what’s still on order.
4. Three-way matching
Before paying, compare three documents:
PO: 500 units at ₹40 = ₹20,000 + GST
Delivery note: 480 units received
Invoice: 500 units at ₹42
Matching reveals two problems — 20 units short and a higher rate — before you pay ₹21,000 + GST instead of ₹19,200 + GST.
Tips for using POs well
- Number POs sequentially and never reuse a number.
- Ask suppliers to quote your PO number on delivery notes and invoices.
- Include clear specifications — sizes, grades, brands, packaging — to avoid “that’s not what we meant”.
- Set an approval limit — e.g. purchases above ₹25,000 need a manager’s sign-off.
- Keep copies of every PO with its matching invoice and delivery note.
Create a PO in minutes
Our Purchase Order Generator includes buyer, vendor and ship-to sections, an item table with tax, discounts and totals, amount in words, delivery date and terms. It remembers your company details and logo on your device and numbers your POs automatically. Download it as a PDF and send it to your supplier.
Free toolTry the Purchase Order GeneratorCreate a professional purchase order to send to your supplier.Frequently asked questions
Is a purchase order legally binding?
Generally, once the supplier accepts it (in writing or by delivering), a PO can form a contract. The exact position depends on its terms and applicable law, so consult a professional for important orders.
Who issues the purchase order?
The buyer issues the PO to the supplier (vendor). The supplier later sends an invoice that refers to the PO number.
Do I need a PO for every purchase?
Many businesses use POs for orders above a set value or for recurring suppliers, and skip them for very small, one-off purchases.
Written by the Toolsopedia team. Spotted an error? Tell us and we’ll fix it.