What Is a Purchase Order (PO)? Meaning, Format, GST and Legal Effect in India (2026)

Ask a supplier why an invoice hasn't been paid and the answer is often "it doesn't match the PO". Ask a buyer why goods were rejected and you'll hear the same. The purchase order is the document that sets what was agreed — and in Indian business it also decides how GST is charged, whether TDS applies, how fast an MSME must be paid and, on GeM, what the government is bound to. This guide is for owners, purchase teams, suppliers and accountants. It explains what a PO is, how it differs from an invoice, quotation and work order, what to put in one, when it becomes legally binding, the GST and TDS points to watch, the three-way match, and how POs work on GeM, with a template and ₹ examples checked in October 2026.

Quick answer

A purchase order (PO) is a document the buyer issues to a supplier to order goods or services, setting out items, quantities, prices, delivery and payment terms. It is an offer under the Indian Contract Act; once the supplier accepts it, it becomes the contract for that purchase. A PO is not a GST document — GST is charged on the supplier's tax invoice, which is matched to the PO and goods receipt before payment.

• Issued by the buyer before supply; the invoice comes from the supplier at supply

• Binding once accepted without changes; changed terms are a counter-offer

• No GST or ITC on the PO itself — only on the tax invoice

• For micro and small suppliers, agreed credit can't exceed 45 days

• On GeM, the contract the buyer generates is the purchase order

What is a purchase order?

A purchase order is a buyer's written instruction to a supplier: "please supply these items, in these quantities, at these prices, to this address, by this date, on these payment terms". It carries a unique PO number that both sides quote on every later document — the supplier's delivery challan, the e-way bill reference, the tax invoice and the payment advice.

For a business, a PO does three things at once. It controls spending, because only an approved PO lets the purchase team commit money. It records the bargain, so there's no argument later about what price or specification was agreed. And it creates the audit trail that accountants, auditors and GST officers follow from order to goods receipt to invoice to payment.

You don't need a PO for every purchase. A shop owner buying ₹500 of stationery won't raise one. But for anything recurring, high-value, made-to-order or bought on credit, a PO is the cheapest protection you can have. Many large companies and government buyers won't pay any invoice that doesn't quote a valid PO number.

Purchase order vs invoice, quotation and work order

These documents are often confused because they carry the same details at different stages.

PO vs other purchase documents

	Quotation	Purchase order	Work order	Tax invoice
Issued by	Supplier	Buyer	Buyer (or client)	Supplier
Stage	Before order	Order placement	Order for a job or service	At or after supply
Main use	Price offer	Buy goods or standard services	Get work done: construction, repair, job work, AMC	Demand payment; charge GST
Legal effect	Offer by supplier	Offer by buyer; contract once accepted	Contract once accepted; often longer terms	Statutory GST document (s.31, Rule 46)
GST	None	None	None	Charged on it
TDS link	—	Large goods purchases above ₹50 lakh	Contract work TDS	TDS deducted on payment/credit

Issued by

Quotation

Supplier

Purchase order

Buyer

Work order

Buyer (or client)

Tax invoice

Supplier

Stage

Quotation

Before order

Purchase order

Order placement

Work order

Order for a job or service

Tax invoice

At or after supply

Main use

Quotation

Price offer

Purchase order

Buy goods or standard services

Work order

Get work done: construction, repair, job work, AMC

Tax invoice

Demand payment; charge GST

Legal effect

Quotation

Offer by supplier

Purchase order

Offer by buyer; contract once accepted

Work order

Contract once accepted; often longer terms

Tax invoice

Statutory GST document (s.31, Rule 46)

GST

Quotation

None

Purchase order

None

Work order

None

Tax invoice

Charged on it

TDS link

Quotation

—

Purchase order

Large goods purchases above ₹50 lakh

Work order

Contract work TDS

Tax invoice

TDS deducted on payment/credit

Purchase order vs invoice. The PO comes from the buyer before supply; the invoice comes from the supplier when goods are dispatched or services billed. The PO says what you agreed to buy. The invoice says what you're being asked to pay. If they don't match, the invoice is wrong or the PO needs amending.

Purchase order vs work order. A PO buys a thing or a defined service at a set price. A work order engages someone to perform work — build a shed, install machinery, do job work on your material, run an annual maintenance contract. Work orders usually set out scope, milestones, materials supplied, labour, completion certificates and retention money. The distinction matters for TDS: payments to contractors for "work" attract TDS at 1% (individual/HUF) or 2% (others), now under section 393 of the Income-tax Act 2025, while a simple purchase of goods generally doesn't.

Purchase order vs proforma invoice. A proforma invoice is the supplier's firm offer before supply, often used to collect an advance. A PO is the buyer's order. In many deals one follows the other. See our guide to what a proforma invoice is.

What to include in a purchase order

A complete PO answers every question the supplier, the stores team and the accounts team will ask later.

Purchase order checklist

0/11

• Buyer's legal name, address, GSTIN and PAN; contact person
• Supplier's name, address, GSTIN and vendor code
• PO number, PO date and reference to the quotation or proforma
• Bill-to and ship-to addresses with state and state code
• Item description, make/specification, HSN or SAC, quantity, unit and rate
• Discounts, freight, packing and insurance — and who bears each
• Whether prices are inclusive or exclusive of GST, and the expected GST rate
• Delivery date or schedule, Incoterm for imports, and delivery location
• Payment terms (advance, credit days, milestones) — within the MSME limit where it applies
• Inspection, warranty, penalty for delay, cancellation and jurisdiction clauses
• Authorised signature and an acknowledgment line for the supplier

Share Print

Write the item description tightly. "MS pipe" invites a dispute; "MS ERW pipe, 50 NB, medium class, IS 1239, 6 m length" doesn't. The same goes for services: "website maintenance" is vague, "monthly maintenance for 12 months, up to 10 content updates a month, uptime above 99%" is enforceable.

Purchase order template

Use this structure as a starting point; values are illustrative.

Make a purchase order nowFree, no login — add items, delivery schedule, GST and terms, then download a PDF PO to send to your supplier.

When does a purchase order become legally binding?

The Indian Contract Act, 1872 governs this. Under section 2, when one person signifies willingness to do something to obtain another's assent, that is a proposal (offer); when the other person signifies assent, the proposal is accepted; and an agreement enforceable by law is a contract. Section 10 adds that agreements made with free consent, by competent parties, for lawful consideration and a lawful object are contracts.

Applied to POs:

• The PO is usually the offer. It becomes binding when the supplier accepts — by signing the acknowledgment copy, confirming by email, or simply starting to manufacture or dispatch against it.
• Acceptance must match. If the supplier replies "accepted, but price ₹23 instead of ₹21.50" or "delivery in 45 days", that isn't acceptance; it is a counter-offer. Nothing binds until the buyer accepts the new terms, often by issuing an amended PO.
• The PO can itself be an acceptance. If the supplier's quotation or proforma was a firm offer and your PO accepts it without changes, the contract is formed when the PO reaches the supplier.
• Conflicting fine print. When the PO's terms say one thing and the supplier's acknowledgment terms say another, courts look at what was actually agreed and how the parties behaved. Avoid the fight by agreeing key terms — price, delivery, payment, warranty, cancellation — in the body of the PO, not just in pre-printed conditions.

For goods, the Sale of Goods Act, 1930 adds rules on delivery, passing of property and the buyer's right to reject goods that don't match the description or sample. Clear specifications in the PO make those rights easy to use.

Once accepted, either side can enforce the PO. If the supplier fails to deliver, the buyer can claim the extra cost of buying elsewhere; if the buyer refuses goods that meet the PO, the supplier can claim its loss. A cancellation clause — for example, free cancellation until production starts, then a charge for work done — saves arguments.

GST and TDS points to get right on a PO

A purchase order has no status under GST. It isn't a tax invoice, doesn't fix the time of supply and can't support input tax credit — section 16 of the CGST Act allows ITC only when the buyer holds the supplier's tax invoice (or debit note) and has received the goods or services. But the PO shapes the GST outcome in several ways.

Ship-to and GSTIN decide the tax type. The supplier works out place of supply from the delivery address and your registration. A PO from your Gujarat GSTIN with a Maharashtra delivery address must say so clearly, or you may get the wrong mix of IGST or CGST/SGST and a credit you can't use. If you have several GSTINs, put the correct one on each PO.

Inclusive or exclusive of GST. "₹21.50 per box" means different things to the two sides unless the PO says "plus GST" or "inclusive of GST". Since the GST 2.0 rate rationalisation from 22 September 2025, many POs that fixed a "GST-inclusive" price were caught when the rate changed between order and supply. Safer wording: "plus GST at the rate applicable on the date of invoice".

The invoice must carry the Rule 46 details. Your accounts team should reject an invoice without your GSTIN, the HSN code, place of supply or the supplier's signature, because ITC depends on it. For unregistered buyers, invoices of ₹50,000 or more must also carry the buyer's name and delivery address.

TDS on purchases. If your turnover in the previous year exceeded ₹10 crore, you must deduct TDS at 0.1% on purchases of goods from a resident seller above ₹50 lakh in the year (old section 194Q, now within section 393). Contract work and job work under a work order attract contract TDS instead. Put the TDS treatment in the PO so the supplier isn't surprised by a short payment. Government buyers may also deduct TDS under GST. Use the TDS calculator to check amounts.

Three-way match: PO, goods receipt and invoice

Before a well-run business pays a supplier, it matches three documents:

How a three-way match works

1. 1

   Purchase order

   Confirms what was ordered — item, quantity, rate and terms — and that it was approved.

2. 2

   Goods receipt note (GRN)

   Prepared by stores when goods arrive, after counting and inspection. Records accepted and rejected quantity.

3. 3

   Supplier's tax invoice

   Checked against the PO for rate and terms, and against the GRN for quantity, and for valid GST details.

4. 4

   Approve or hold payment

   If all three agree within tolerance, the invoice is booked, ITC is claimed when it appears in GSTR-2B, and payment is scheduled. If not, the invoice is held and the difference is raised with the supplier.

Take the box order above. The PO is for 5,000 boxes at ₹21.50 in the first lot. Stores accept 4,920 and reject 80 for low burst strength. The supplier invoices 5,000 boxes at ₹21.50 — ₹1,07,500 plus GST. The three-way match flags 80 boxes (₹1,720 plus GST) not received in good order. Accounts pay for 4,920 and ask the supplier for a credit note for the rest, or a replacement lot. Many companies set a tolerance — say ±2% on quantity or ₹500 on value — to avoid holding invoices over tiny rounding differences.

A two-way match (PO and invoice only) is common for services, where there are no goods to receive; a service completion certificate or timesheet takes the place of the GRN.

Types of purchase orders

• Standard PO — one-off purchase with fixed items, quantity, price and delivery date.
• Blanket PO — an agreed rate for an item over a period (say, a year) with deliveries called off against it as needed; good for consumables and packaging.
• Planned PO — items and prices fixed, with tentative delivery dates confirmed later through release orders.
• Contract PO — a framework agreement on terms and conditions, against which separate standard POs are issued.

Small businesses rarely need all four. A standard PO for one-off buys and a blanket PO for repeat items covers most needs.

A simple PO process for a small business

You don't need ERP software to run purchase orders well. A ten-person workshop can do it with a numbered PO book or a spreadsheet and a free generator, as long as four habits stick.

First, one person raises, another approves. The supervisor who needs the material raises the PO; the owner or a partner approves anything above an agreed limit, say ₹25,000. That split alone stops most purchasing leaks, from inflated rates to orders placed with a relative's firm. Second, number POs in one series per financial year and never reuse a number, so every invoice can be traced. Third, send the PO before the supplier starts work and file the supplier's acceptance — an email reply is fine. Fourth, close the loop: when the goods arrive, stores writes the PO number on the GRN, and accounts won't book an invoice that lacks it.

PO process for a small business

Step 1

Requisition

user asks

Step 2

PO raised

numbered

Step 3

Approval

above ₹ limit

Step 4

Supplier accepts

in writing

Step 5

GRN

count + inspect

Step 6

Invoice match

pay on terms

The same discipline helps at year-end. Auditors ask how you know purchases are genuine and recorded in the right period; a file of approved POs, GRNs and matched invoices answers that in minutes. It also makes GST reconciliation easier, because every invoice in GSTR-2B can be tied back to an order you actually placed — and anything in GSTR-2B that has no PO behind it is worth questioning before you claim the credit.

Payment terms, MSME suppliers and GeM

MSME payment limits. If your supplier is a micro or small enterprise registered on Udyam, section 15 of the MSMED Act caps the payment period you can agree at 45 days from acceptance of the goods or services. A PO saying "payment in 90 days" doesn't override that. Pay late and you owe compound interest at 3× the RBI bank rate, and under section 37(2)(g) of the Income-tax Act, 2025 the expense is deductible only in the year you actually pay. Suppliers can approach the MSE Facilitation Council through MSME Samadhaan. Our guide to the MSMED Act explains the rules in detail.

Government purchases on GeM. On the Government e-Marketplace, the buyer creates a demand, obtains sanction and generates a contract. GeM's General Terms and Conditions define that contract as the purchase order created by the buyer on GeM, including the scope of supply, delivery instructions and specifications, read with the GTC and any special or additional terms. The seller accepts and delivers, the consignee inspects and issues a Consignee Receipt-cum-Acceptance Certificate (CRAC), the seller raises the bill online, and payment is due within 10 days of the CRAC and bill unless the contract says otherwise. Read the special terms (STC/ATC) on each GeM contract before accepting — they override the general ones. See GeM registration to start selling.

Imports. When you pay a foreign supplier in advance, your bank will typically ask for the supplier's proforma invoice and your purchase order showing advance terms, acknowledged by the supplier, before remitting.

Common PO mistakes and how to avoid them

• Raising the PO after the invoice ("after-the-fact POs"). It defeats spending control and auditors flag it. Raise the PO before committing.
• Vague specifications that make rejection disputes unwinnable.
• Wrong GSTIN or ship-to address, which leads to wrong tax type and lost ITC.
• Payment terms beyond 45 days for MSE suppliers, which are unenforceable and create tax disallowance.
• Not getting acceptance in writing. An email "PO accepted" from the supplier is enough; silence followed by a different invoice isn't.
• Amending by phone. Any change in price, quantity or date should go out as a numbered PO amendment.

Official links

• Indian Contract Act, 1872 (India Code)Offer, acceptance and contract — sections 2 to 10
• CGST Rules — Rule 46 (tax invoice)What the supplier's invoice must show
• CGST Act — section 16 (input tax credit)ITC conditions
• GeM General Terms and ConditionsContract = buyer's PO on GeM; CRAC and payment
• RBI FAQs — delayed payments to MSEs45-day limit and interest
• MSME SamadhaanFile a delayed-payment case

What to do next

Create your next order with the free purchase order generator, and ask suppliers to acknowledge it in writing. Set up a GRN step in stores, and match every invoice to its PO and GRN before payment. If you're the supplier, read what a proforma invoice is to handle advances correctly.

This is general information, not legal or tax advice — confirm on the official source or with a professional.

Frequently asked questions

What is a purchase order in simple words?

A purchase order (PO) is a document a buyer sends to a supplier to order goods or services. It lists what is being bought, how many, at what price, where and when to deliver, and how payment will be made. Once the supplier accepts it, the PO becomes the agreed contract for that purchase, and the supplier's invoice is checked against it before payment.

Is a purchase order legally binding in India?

A PO is an offer under the Indian Contract Act, 1872. It becomes a binding contract when the supplier accepts it without changing the terms — by signing an acknowledgment, confirming by email or starting to perform. If the supplier accepts with different terms, that is a counter-offer, and the deal binds only once the buyer accepts those changes.

Is GST charged on a purchase order?

No. A purchase order is the buyer's document and has no tax status under GST. GST is charged on the supplier's tax invoice issued at the time of supply, and the buyer claims input tax credit on that invoice, not on the PO. The PO should still state whether prices are inclusive or exclusive of GST and give the buyer's GSTIN and delivery state.

What is the difference between a purchase order and an invoice?

The buyer issues the purchase order before supply to order goods and fix the terms. The supplier issues the invoice after or at the time of supply to ask for payment and charge GST. The PO creates the commitment; the invoice records the sale. Accounts teams match the two, along with the goods receipt note, before paying.

What is the difference between a purchase order and a work order?

A purchase order is mainly used to buy goods or standard services at a fixed price. A work order is used to get a job done — construction, installation, repairs, job work or a service contract — and usually defines scope, milestones, labour and completion. Payments under work orders to contractors often attract TDS as contract work.

What is a PO on GeM?

On the Government e-Marketplace, the 'contract' generated by the buyer is the purchase order. GeM's General Terms and Conditions define the contract as the purchase order created by the buyer on GeM, with scope, delivery instructions and specifications. After delivery the consignee issues a CRAC, and payment is due within 10 days of the CRAC and online bill unless the contract says otherwise.

Sources & verification

Figures on this page were checked against the sources below when it was last reviewed on 8 October 2026. Each rate and limit is stored once with its own official source and review date, and official update channels are monitored daily so changes are picked up. How we verify

1. 1.The Indian Contract Act, 1872 — India Code, Legislative Department · accessed 8 October 2026
2. 2.CGST Rules, Rule 46 — Tax invoice — CBIC · accessed 8 October 2026
3. 3.CGST Act, section 16 — Eligibility and conditions for input tax credit — CBIC · accessed 8 October 2026
4. 4.General Terms and Conditions on GeM — Government e-Marketplace · accessed 8 October 2026
5. 5.FAQs on delayed payments to micro and small enterprises — Reserve Bank of India · accessed 8 October 2026
6. 6.Application for advance remittance towards direct import bills — HSBC India · accessed 8 October 2026
7. 7.Comprehensive analysis of seller and buyer processes on GeM — Axitrust · accessed 8 October 2026