The purchase order (PO) is the document that formalizes the acquisition of goods or services between a buyer and a supplier. Learning to create one correctly is fundamental for any procurement professional.
What is a Purchase Order?
A purchase order (PO) is a commercial document issued by the buyer to the supplier to formally request the delivery of goods or services under specific conditions. It functions as a contract that establishes what is being purchased, in what quantity, at what price, and under what terms.
Step by Step: How to Create a Purchase Order
1. Identify the Need
Before issuing a PO, make sure the purchase is justified and approved. Clearly define what you need, in what quantity, and by when. This step is typically formalized with a purchase requisition.
2. Select the Supplier
If you've already conducted an RFQ or sourcing event, the supplier will be defined. If not, select from your approved supplier base according to price, quality, and reliability criteria.
3. Complete the Header Information
Include:
- Purchase order number (sequential)
- Issue date
- Complete buyer details (company, address, tax ID)
- Complete supplier details
4. Detail the Line Items
For each line include:
- Description of the item or service
- Reference code (if applicable)
- Quantity
- Unit of measure
- Unit price
- Total amount per line
5. Establish Commercial Terms
- Payment terms (cash, net 30, etc.)
- Delivery location
- Required delivery date
- Warranty conditions
6. Calculate Totals
Subtotal + taxes (VAT/sales tax) = Total purchase order amount.
7. Get Approval and Send
According to your company's policy, obtain the signature or electronic approval from the responsible party, and send the PO to the supplier.
Common Mistakes When Creating Purchase Orders
Even experienced procurement teams make mistakes that can generate operational and financial problems. The most frequent are:
- Ambiguous descriptions: writing "screws" instead of "M8x40 stainless steel screws" creates confusion, incorrect deliveries, and returns. The more specific the description, the smaller the margin for error.
- Not referencing the quote: every PO should include the quote or RFQ number that originated it. This facilitates traceability and avoids discussions about prices or terms.
- Omitting delivery conditions: if you don't specify exact address, receiving hours, and destination contact, the supplier may deliver at the wrong place or time.
- Not defining tolerances: for bulk or weight-based purchases, it's important to define acceptable tolerances (for example, +/- 5%). Without this, each delivery can generate discrepancies and delays in acceptance.
The Purchase Order as a Legal Instrument
It's important to understand that an accepted purchase order constitutes a contractual commitment. This means that the established conditions (price, quantity, deadline, delivery location) are binding for both parties. That's why it's fundamental that the PO is accurate and complete before sending. Modifying a PO after issuance requires formal communication and agreement from both parties, which generates additional work and can damage the commercial relationship.
In companies with master agreements, the PO functions as a "call-off" against that contract: it references the already-agreed terms and only specifies quantities and delivery dates. This simplifies the process and reduces the possibility of errors.
Types of Purchase Orders
Not all purchase orders are the same. Depending on the acquisition context, there are different variants worth knowing:
- Standard PO: the most common. Issued for a specific purchase with defined quantities, prices, and deadlines. This is what we described in the step-by-step above.
- Blanket PO (open order): establishes a price and general terms agreement with a supplier for a determined period, without fixing exact quantities. Deliveries are requested as needed against this framework PO. Ideal for recurring consumption items.
- Planned PO: defines estimated quantities for a future period, with tentative delivery dates. Allows the supplier to plan production and the buyer to ensure availability without committing to exact quantities.
Choosing the right type of PO for each situation optimizes both internal management and the supplier relationship. Using a standard PO for recurring purchases generates unnecessary repetitive work, while a blanket PO for a one-time purchase can generate unwanted commitments.
Managing Modifications and Cancellations
In practice, not all purchase orders are executed exactly as issued. Sometimes quantities change, delivery dates are modified, or the purchase is even cancelled. To manage these changes professionally, keep these best practices in mind:
- Document every change: every modification should be formally recorded, with the date of change, the reason, and the responsible party's approval. Don't make verbal changes or via informal messages.
- Issue a PO revision: instead of creating a new PO, issue a revised version (PO Rev. 1, Rev. 2) that maintains traceability with the original document.
- Communicate to the supplier in writing: the supplier must confirm in writing that they accept the modification. This avoids misunderstandings and protects both parties.
- Record cancellations with reason: if a PO is cancelled, document the reason. This information is valuable for later analysis and for improving the accuracy of future purchases.
Purchase Order Example
Here's a simplified example:
- PO #: 2026-0042
- Supplier: Industrial Supplies Inc.
- Item: M8x40 stainless steel screws — 500 units — $2.50 ea. — $1,250
- Item: M8 stainless steel nuts — 500 units — $1.20 ea. — $600
- Subtotal: $1,850 | Tax (10%): $185 | Total: $2,035
- Payment: Net 30 from invoice date
- Delivery: Main Warehouse, 02/15/2026
Download Your Free Template
We've prepared a professional purchase order template downloadable in Excel and PDF. It's completely free and ready to use.
Automate Your Purchase Orders
If your company issues more than 20 purchase orders per month, managing each one manually consumes valuable time. With Sourced, purchase orders are automatically generated when you award an RFQ, with all the correct data synchronized with your ERP. This eliminates manual work, reduces transcription errors, and ensures every PO is consistent with the approved RFQ terms.