What Is a Purchase Order? Definition, Format & Process Explained

Remember Ramesh, from our guide on accounts payable? Before he owed Ace Traders that ₹1,00,000 for cement, something else happened first.

Ramesh had to tell Ace Traders exactly what he wanted — how much cement, what price, and by when. He didn’t just call and say “send cement.” He sent a proper written order. That document is called a purchase order, and it’s the step that starts the whole chain — order, delivery, invoice, and finally, payment.

This guide explains what a purchase order actually is, what it should contain, and how the process usually flows from request to payment.

What Is a Purchase Order?

A purchase order is a document a buyer sends to a supplier, spelling out exactly what’s being ordered — the product or service, the quantity, the price, and the delivery date. It’s also called a PO for short.

Think of it like placing a food order at a restaurant counter. You don’t just say “give me something to eat.” You specify the dish, the quantity, and how you want it. The purchase order does the same job for a business transaction — it removes guesswork on both sides.

Once the supplier accepts the PO, it becomes a legally binding agreement. Both sides now know exactly what was promised — the items, the price, and the delivery terms.

What Details Go Into a Purchase Order

A purchase order usually includes:

• Products or services being ordered
• Quantities (kg, metres, numbers, etc.)
• Price agreed for the order
• Name of the vendor the order is sent to
• Delivery address where the goods should reach
• Billing address of the buyer’s company
• Payment terms and conditions
• Expected delivery date

A Sample Purchase Order Format

Every business can customize this to its own needs, but the core fields above rarely change — they’re what makes a PO clear and useful to both sides.

The Purchase Order Process, Step by Step

The exact process differs from business to business, and even from product to product within the same business. There’s no single “correct” way — only what works for how you operate. Here’s the version most organized businesses follow:

1. The department that needs the material raises a request, with basic details of what’s needed.
2. A manager, or the finance department, approves the request before the PO is created.
3. The PO is sent to the supplier, who’s automatically notified to review it.
4. The supplier either accepts the order, or declines with a reason.
5. Once accepted, and the delivery date is confirmed, the details go to the receiving department.
6. Goods are received, checked physically, the invoice arrives, and payment follows within the agreed terms.

Smaller businesses often skip a few of these steps — maybe there’s no formal approval stage at all. That’s fine. What matters is that the process fits how your business actually runs, not that it matches a textbook diagram.

Purchase Order vs. Purchase Invoice

These two documents look similar, but they’re not the same thing, and mixing them up causes real confusion in the payment process.

In Ramesh’s case: the PO is what he sent Ace Traders before the cement arrived. The invoice is what Ace Traders sent him afterward — and that invoice is exactly what turned into the accounts payable we covered in our earlier guide.

How Businesses Manage Purchase Orders Today

Once an order is placed, the item, quantity, and expected delivery date are tracked against the PO number. When goods arrive, that PO gets matched to the delivery note and later to the invoice, and finally to the payment made.

Doing this on paper works, until you’re juggling more than a handful of orders at once. Most growing businesses move this into accounting software instead, which tracks the entire journey — order placed, goods received, invoice matched, payment made — and flags anything that doesn’t line up. The same warning signs we cover in 5 signs your billing has outgrown spreadsheets apply just as much to purchase order tracking.

For businesses managing stock across multiple godowns or branches — common for wholesalers and retailers across Andhra Pradesh — this tracking matters even more. Features like the ones in Shoper 9 handle purchase orders, transfers, and stock-in-transit together, so nothing gets lost between “ordered” and “received.”

Frequently Asked Questions

About AtTally Sofper Pvt. Ltd.

We’re AtTally Sofper Pvt. Ltd., an authorized Tally partner with over 27 years of experience, and offices in Visakhapatnam (Vizag) and Vijayawada.

We help businesses across Andhra Pradesh set up TallyPrime to track their full purchase cycle — from the purchase order, right through to the final payment — so nothing slips between what was ordered and what actually arrives. We offer full online and remote support.

Want your purchase orders and payables tracked in one place? Talk to our team for a free consultation.