ElyForma

Purchase Order Guide

Purchase Order Guide South Africa

A purchase order is a written document issued by a buyer to a supplier to confirm that the buyer wants to purchase specific goods or services on agreed terms. In South Africa, purchase orders are commonly used by businesses, schools, public bodies, contractors, property managers, and other organisations that want a clear approval trail before a supplier delivers or invoices.

This guide explains what a purchase order is, when to use one in South Africa, how it differs from an invoice, and what a good purchase order should include.

What is a purchase order?

A purchase order, often called a PO, is a document created by the buyer before payment is made. It usually confirms:

  • the buyer’s details
  • the supplier’s details
  • the goods or services being ordered
  • the quantity
  • the price
  • the delivery date or time frame
  • the delivery location
  • the purchase order number
  • any special terms or instructions

A good purchase order creates a clear record of what was ordered and on what terms. It helps the buyer control spending and helps the supplier understand exactly what must be supplied.

Why purchase orders matter in South Africa

Purchase orders matter because they create structure and control in the buying process. In South Africa, they are especially useful for:

  • internal spending approval
  • supplier order confirmation
  • matching orders to invoices
  • tracking deliveries
  • reducing disputes about price, quantity, or scope
  • keeping proper procurement and accounting records

A purchase order is often one of the easiest ways to show that a purchase was authorised before the supplier delivered the goods or services.

Purchase order vs invoice

These are related, but they are not the same.

Purchase order

A purchase order is created by the buyer before the goods or services are supplied. It is an order or authorisation to purchase.

Invoice

An invoice is created by the supplier after the goods or services are supplied, or in line with the agreed billing process. It is a request for payment.

In practice, a common sequence looks like this:

  1. Buyer issues purchase order
  2. Supplier supplies goods or services
  3. Supplier issues invoice
  4. Buyer pays supplier

A purchase order should not be treated as a substitute for an invoice.

Purchase order vs tax invoice

This is an important South African point.

A purchase order is a procurement and control document. A tax invoice is a VAT document. If the supplier is VAT-registered and VAT is being charged, the supplier may still need to issue a proper tax invoice with the required details.

That means a South African business should not assume that a purchase order is enough for VAT purposes. A PO helps manage the purchase. The invoice or tax invoice supports billing and tax records.

When to use a purchase order

A South African purchase order is useful when:

  • a business buys stock, materials, or equipment
  • a company wants management approval before money is spent
  • a supplier needs a formal order before starting work
  • the buyer wants a paper trail before delivery
  • the transaction is part of a structured procurement process
  • the goods or services must match a specific budget or project
  • the buyer wants to compare the order against the invoice later

It is especially useful where multiple people are involved in buying, approving, receiving, and paying.

When not to rely on a purchase order alone

A purchase order is useful, but it may not be enough on its own if:

  • the transaction needs a full service agreement or supply contract
  • the order is large or complex
  • the project involves milestones, penalties, IP, or confidentiality terms
  • the supplier relationship is ongoing and needs fuller commercial terms
  • the purchase also requires a tax invoice, delivery note, or signed agreement
  • the transaction is disputed or highly customised

In those situations, the PO should work together with the other documents instead of replacing them.

Common South African use cases

A purchase order is commonly used in South Africa for:

  • office supplies
  • building materials
  • maintenance work
  • equipment purchases
  • contractor services
  • event services
  • school procurement
  • business stock orders
  • facility management work
  • recurring supplier orders

It is also widely used in structured procurement environments where the organisation wants each purchase to carry its own reference number and approval record.

What to include in a South African purchase order

A strong purchase order should usually include the following.

Purchase order number

Each PO should have a unique reference number.

Buyer details

Include the legal or trading name of the buyer, contact details, and where relevant, registration or VAT details.

Supplier details

Include the supplier’s name and contact details.

Order date

State the date on which the purchase order was issued.

Delivery details

Include:

  • delivery address
  • contact person
  • expected delivery date
  • any receiving instructions

Description of goods or services

Describe the items clearly. Avoid vague wording where possible.

Quantity and unit price

State how many items are ordered and the price per unit where relevant.

Total value

Show the total order value clearly.

VAT position

It is useful to state whether prices are VAT-inclusive or VAT-exclusive where relevant.

Payment terms

If relevant, refer to the agreed payment terms, such as 30 days from invoice date.

Special instructions

This may include:

  • project reference
  • site rules
  • installation requirements
  • service timing
  • quote reference
  • authorised contact person

Authorisation

A purchase order often includes the name or signature of the person who approved the order.

Why PO numbers are useful

The purchase order number is often one of the most important parts of the document. It helps the buyer and supplier match:

  • the original order
  • the delivery
  • the invoice
  • the payment
  • the accounting record

Without a clear PO number, it becomes harder to track whether the invoice matches what was actually ordered.

Matching purchase orders to invoices

A very common business control process is matching:

  • purchase order
  • delivery note
  • invoice

This helps answer questions like:

  • Did we order this?
  • Did we receive this?
  • Is the invoice amount correct?
  • Does the quantity match?
  • Was the price the agreed price?

This is one of the main reasons purchase orders are so useful in both small and large South African organisations.

Purchase orders in public and formal procurement

In more formal procurement settings, purchase orders are often part of a wider approval and contract system. A PO may follow:

  • quotation approval
  • budget approval
  • supplier selection
  • contract award
  • internal delegation approval

That means the purchase order often acts as the operational instruction that follows the approval decision.

Common mistakes

Common South African purchase-order mistakes include:

  • issuing a PO after the goods or services were already supplied
  • not using a unique PO number
  • vague item descriptions
  • unclear VAT wording
  • not stating delivery details
  • mismatched prices between quote and PO
  • assuming the PO is the same as an invoice
  • failing to get approval before issuing the order
  • using a PO where a full agreement is actually needed

These mistakes reduce the usefulness of the purchase order and can cause accounting or supplier disputes later.

Practical questions before issuing a purchase order

Before issuing a purchase order, ask:

  • What exactly are we ordering?
  • Has the spend been approved?
  • Does the supplier need a PO before delivery?
  • Are the prices final and correct?
  • Is VAT included or excluded?
  • Do we also need a contract or service agreement?
  • Who will receive and verify the goods or services?

These questions help make the PO more accurate and useful.

Example of when this guide is useful

This guide is useful for:

  • a South African SME setting up a simple procurement process
  • a company ordering stock from suppliers
  • a property manager issuing maintenance orders
  • a business wanting better invoice control
  • an organisation wanting cleaner approval and spending records

FAQ

What is a purchase order in South Africa?

It is a written document issued by a buyer to a supplier confirming that the buyer wants to purchase specific goods or services on agreed terms.

Is a purchase order the same as an invoice?

No. A purchase order is issued by the buyer before supply. An invoice is issued by the supplier to request payment.

Is a purchase order the same as a tax invoice?

No. A purchase order is a buying and approval document. A tax invoice is a VAT document used for billing and tax purposes.

Do small businesses need purchase orders?

They are not always mandatory, but they are very useful. Even a simple PO system can improve control, reduce disputes, and help with recordkeeping.

Should a purchase order include VAT?

It should clearly state whether the prices are VAT-inclusive or VAT-exclusive where relevant.

Can a purchase order be used for services?

Yes. Purchase orders can be used for both goods and services, although complex services may also need a fuller contract.

Related guides

You may also want to read:

  • Invoice Template
  • Payment Receipt Guide
  • Equipment Sale Agreement Guide
  • Service Agreement
  • Contractor Invoice
  • Financial Statement Template Guide
  • Business Sale Agreement Guide
  • Sales Agreement

A strong South African purchase order should clearly identify the buyer, supplier, items, price, delivery details, and approval reference so the order can be matched properly to delivery, invoice, and payment.