Purchase Order vs Invoice- Key Differences

A Purchase Order (PO) is a formal document that a buyer sends to a supplier when they want to purchase goods or services. It clearly outlines what the buyer needs, including the items or services, quantities, agreed prices, delivery details, payment terms, and any other important conditions. Once the supplier accepts the PO, it acts as an official record of the order and helps both parties stay on the same page.

An Invoice, on the other hand, is issued by the seller after the goods or services have been delivered. It tells the buyer exactly how much they need to pay and usually includes details such as the products or services provided, prices, taxes, discounts, payment terms, and the payment due date.

Businesses use several documents to manage purchasing, sales, and payments. Two of the most important documents in this process are a purchase order (PO) and an invoice.

Differences Between a Purchase Order and an Invoice

Purchase orders and invoices are closely connected; they are not interchangeable. The following are the key differences between them:

Types of Purchase Orders

There are different types of purchase orders depending on the nature and frequency of the purchases. The main types include:

1. Standard Purchase Order

A standard PO is used for a specific purchase with clearly defined details. It normally states the products or services, quantities, prices, delivery date, and other terms.

2. Blanket Purchase Order

A blanket PO is used when a buyer expects to purchase the same or similar goods or services from a supplier repeatedly over a period of time. It can simplify recurring purchases and reduce the need to create a new PO for every transaction.

3. Contract Purchase Order

A contract PO is generally associated with an established agreement between a buyer and supplier. The agreement sets out terms and conditions, while individual orders may be placed under that arrangement.

4. Planned Purchase Order

A planned PO is used when a business knows that it will require certain goods or services but may not yet know the exact delivery dates or quantities for every delivery. It helps businesses plan future purchases.

5. Service Purchase Order

A service PO is used when a business purchases services rather than physical products.

Therefore, the appropriate type of PO depends on the organization's purchasing requirements, supplier relationships, and internal procurement policies.

How to Create a Purchase Order

Creating a purchase order involves the details of a proposed purchase clearly and accurately. The following steps can help:

Step 1: Identify the Purchase Requirement

Determine what goods or services are needed, including the required quantity, specifications, and expected delivery date.

Step 2: Select the Supplier

Choose a suitable supplier based on factors such as price, quality, availability, delivery terms, and previous business relationships.

Step 3: Add Buyer and Supplier Information

Include essential details such as:

• Buyer's business name and contact information
• Supplier's business name and contact information
• Billing and delivery addresses
• Relevant tax or registration details, where applicable

Step 4: Add Purchase Details

Clearly list:

• PO number
• Product or service description
• Quantity
• Unit price
• Applicable discounts
• Taxes
• Total purchase value
• Delivery date and location

Step 5: Specify Terms and Conditions

Include payment terms, delivery requirements, cancellation conditions, warranties, or other relevant contractual requirements.

Step 6: Review and Approve the PO

The purchase order should be checked for accuracy and approved according to the company's internal purchasing process.

Step 7: Send the PO to the Supplier

Once approved, the PO is sent to the supplier. The supplier can accept the order, request changes, or reject it.

How to Create an Invoice

An invoice should provide the buyer with all the information needed to understand the transaction and make the payment. The basic steps are:

Step 1: Add Seller Information

Include the seller's business name, address, contact details, and applicable tax or registration information.

Step 2: Add Buyer Information

Enter the customer's name or business name, billing address, and other relevant details.

Step 3: Assign an Invoice Number

Every invoice should have a unique invoice number. This makes it easier to track transactions and maintain accounting records.

Step 4: Include the Transaction Details

List the products or services provided, including:

• Description
• Quantity
• Unit price
• Discounts
• Taxes
• Subtotal
• Total amount due

Step 5: Mention the Purchase Order Number

If the transaction was initiated with a PO, include its number on the invoice. This allows the buyer to match the invoice with the original order.

Step 6: Add Payment Terms

Clearly state the payment due date and accepted payment methods. For example, an invoice may specify that payment is due within 30 days.

Step 7: Review and Send the Invoice

Check all calculations and transaction details before sending the invoice to the customer. A clear and accurate invoice can reduce payment delays and disputes.

Conclusion

Purchase orders and invoices are essential documents in the business purchasing and payment process, but they serve different purposes. A purchase order is created by the buyer to formally request goods or services, whereas an invoice is issued by the seller to request payment for goods or services supplied.