How to fill out a purchase order online: A step-by-step guide for businesses

To fill out a purchase order, enter a unique PO number and date, the buyer and vendor details, the bill-to and ship-to addresses, each item’s quantity and unit price, the total cost, and the delivery and payment terms in a single official document. Review the purchase order details, obtain any required internal approvals, and send the completed PO to the supplier, keeping a copy for your records.

TL;DR

• A purchase order (PO) is a buyer-issued document that lists what you are buying, from whom, at what price, and under what terms.
• Gather vendor information, item details, prices, addresses, and approval requirements before you start.
• Give each PO a unique purchase order number so you can track transactions and match records later.
• Check vendor information, delivery details, totals, and approval requirements before sending the PO.
• With pdfFiller, you can fill, edit, review, and share purchase order forms online without relying on a print-and-scan workflow.

Introduction

Every business purchase raises the same questions: what is being bought, from which vendor, for how much, and when it will arrive. A purchase order answers all of them in one official document. It gives the buyer and the seller a shared record of the order details, the delivery date, and the payment terms before any money changes hands. That record helps prevent disputes, supports cash flow planning, and gives accounts payable a clear reference when the vendor invoice arrives.

This guide is for small business owners across industries, purchasing staff, operations and finance teams, and anyone preparing a first PO. You’ll learn what information a purchase order should include, how to complete each section correctly, what happens after sending it, and how to fill out a purchase order template online with pdfFiller.

Disclaimer: This article is for informational purposes only and does not constitute legal or financial advice. Always consult with a qualified legal professional regarding your specific situation.

What is a purchase order?

A purchase order, often shortened to PO, is an official request from a buyer to a vendor to purchase goods or services under specific terms. The buyer creates it, specifying quantity, unit price, delivery details, and payment terms. In simple terms, the purchase order means “this is exactly what we want to buy and the conditions we are offering.”

A PO works as an offer. When the vendor accepts it, the PO usually becomes part of a legally binding contract. In the United States, sales of goods are generally governed by Article 2 of the Uniform Commercial Code (UCC), which has been adopted with some variations. Under UCC § 2-206, a vendor can accept an order in any reasonable way, including by promptly shipping the goods.

Businesses commonly use four types of purchase orders:

• Standard purchase order: A one-time order with known items, quantities, prices, and delivery dates.
• Planned purchase order: Items and prices are set in advance, but delivery dates are estimated. The buyer later releases orders against it.
• Blanket purchase order: It covers recurring purchases from one vendor over a period, often with a spending limit, such as office supplies billed at agreed rates.
• Contract purchase order: The buyer and vendor agree on general terms first, and individual purchase orders reference that agreement.

What information do you need before filling out a purchase order?

Collecting everything first saves time and reduces errors. Use this checklist before you open your purchase order form.

When onboarding certain U.S. vendors or independent contractors, your company may separately need to collect taxpayer information on Form W-9 for applicable information-reporting purposes. The IRS explains that Form W-9 provides a payee’s correct taxpayer identification number to a requester, and you can read more in pdfFiller’s guide to how to fill out Form W-9.

How do you fill out a purchase order step by step?

The exact layout varies among purchase order forms, but the following workflow covers the fields found on most standard purchase orders.

Step 1. Assign the purchase order number and date

Enter a unique PO number in the header. A consistent numbering system makes managing purchase orders easier because employees can refer to the same identifier during approval, delivery, invoicing, and payment.

Most businesses use a sequential format, such as PO-2026-0147, that combines a prefix, the year, and a running number. Never reuse a number, because the PO number links the order to the receiving record and the vendor invoice. Next, add the PO date, which is the date you issue the order. 

Step 2. Enter the buyer’s information

Add your company’s legal name, business address, and phone number. Include the name, email address, and phone number of the person the vendor should contact with questions. If your organization uses department or cost center codes, add them here. This helps finance match business purchases to the correct budget.

Step 3. Add the supplier or vendor details

Enter the vendor information exactly as it appears in your supplier records. Usually, this includes the vendor’s business name, address, email or phone number, and contact person.

Check these details especially carefully when several branches or locations use similar names. Incorrect vendor details can cause delivery or billing delays.

Step 4. Complete the bill-to and ship-to information

The bill-to address tells the vendor where to send the invoice. This is often your accounts payable department. The shipping address tells the vendor where to deliver the goods, which may be a warehouse, job site, or branch office. Add location details, such as a suite number, dock hours, or a receiving contact, to avoid failed deliveries.

Step 5. Enter each product or service

List each item on its own line. For every line, include:

1. Item number or SKU (Stock Keeping Unit)
2. Detailed description, including size, color, model, or service scope
3. Quantity and unit of measure (each, box, case, hour)
4. Unit price
5. Line total (quantity × unit price)

A clear description prevents substitutions. For example, “Copy paper, letter size, 20 lb, white, 10 reams per case” is better than “paper.”

Step 6. Calculate the subtotal and additional charges

Multiply each quantity by its unit price and check every line total. Then calculate the subtotal and add any agreed shipping costs, fees, taxes, or other charges.

Include discounts when they apply and verify the final total cost. Tax treatment depends on the goods or services, parties, and jurisdiction, so do not assume the same tax rules apply to every purchase.

Step 7. Add delivery and payment terms

State the requested or expected delivery date and any necessary shipping instructions. If the transaction uses specific freight or delivery terms, record them clearly rather than relying on assumptions. 

Then add the agreed payment terms, such as Net 30, when applicable. Clear terms help both the buyer and supplier understand when performance and payment are expected. Common payment terms include:

• Net 30: Full payment is due 30 days after the invoice date.
• 2/10 Net 30: The buyer gets a 2% discount if they pay within 10 days. Otherwise, the full amount is due in 30 days.
• Due on receipt: Payment is due when the invoice arrives.

Step 8. Add notes, approval, or authorization information

Use the notes field for special instructions, such as “Call receiving 24 hours before delivery” or “Reference quote #4471.” Then complete the approval section. Many businesses require authorized signatures based on the order amount. For example, managers may approve orders up to $2,500, while a director must approve larger ones. 

Step 9. Review and send the purchase order

Check every field against the vendor quote. Confirm the math, the addresses, and the delivery date. Then send the PO to the vendor by email, via a vendor portal, or via electronic data interchange (EDI), if your company uses it. Save a copy for your records so you can match it later.

An example of a Purchase order fillable template opened in pdfFiller editor.

How do you fill out a purchase order using pdfFiller?

pdfFiller is an all-in-one cloud-based platform that helps millions of individuals and SMBs fill out, edit, sign, share, and securely store their documents online. It suits teams that need a reliable PO process without a complex procurement platform. Here is how to fill out a purchase order template online:

1. Find or upload a template. Search pdfFiller’s form library for a purchase order free template, or upload your own. You can also build one from scratch with the online PDF creator.
2. Fill in the fields. Enter the PO number, vendor details, and line items directly into the form fields. You can also add checkmarks, dates, and text anywhere on the page.
3. Edit the layout if needed. Customize your purchase order with your company logo and add fillable fields to create a purchase order template your team can easily reuse.
4. Sign or request approval. Add a legally binding electronic signature yourself, or send the PO to a manager for approval. See our practical guides on how to add an electronic signature to a PDF and how to collaborate on the PDF with your team.
5. Share and store. Save the completed purchase order and send it to your vendor via email or secure link. Organize your POs in your pdfFiller account using tags and smart folders for easy future document retrieval.

You can also speed up PO drafting with AI prompts in pdfFiller. For more guidelines on form workflows, explore our guide on the top 20 questions about filling out forms online.

Security and compliance 

pdfFiller protects your sensitive purchase order data with robust security and compliance standards. All files are protected using 256-bit encryption both at rest and in transit. To safeguard user privacy and meet strict organizational requirements, pdfFiller maintains SOC 2 Type II certification and full compliance with GDPR, CCPA, and PCI DSS standards. Additional security controls include detailed audit trails, password-protected, encrypted folders, and two-factor signer authentication. It also complies with the U.S. ESIGN Act, so all signatures created with pdfFiller are legally binding and court-admissible. 

What does a completed purchase order look like?

Here is a simplified purchase order example for a small dental practice ordering supplies.

PO number: PO-2026-0147 | PO date: October 5, 2026
Buyer: [Buyer’s Company Name], [Buyer’s Address]. Contact: [Name, Last Name], Procurement Manager
Vendor: [Vendor’s Company Name], Vendor ID NOS-221
Ship to: [Delivery Address], receiving hours 8 a.m. to 4 p.m.
Expected delivery date: October 15, 2026 | Payment terms: Net 30

Authorized by: [Name, Last Name], Procurement Manager, September 28, 2026

A real example purchase order form may include additional fields for taxes, shipping costs, account codes, quotation numbers, discounts, or authorized signatures. The key is that both the buyer and seller can identify what is being ordered and the terms attached to the order.

What happens after you send a purchase order?

Once the supplier receives the PO, they may accept the order, request changes, or raise questions about pricing, availability, quantity, or delivery. The exact purchase order process depends on the parties’ agreement and purchasing procedures. A typical sequence looks like this:

1. The seller reviews the order. The vendor accepts it, rejects it, or proposes changes. Many vendors send an order acknowledgment.
2. The vendor fulfills the order. The vendor ships the goods or starts the service by the delivery date.
3. You receive and inspect the goods. Your team counts the items, checks their condition, and records what arrived.
4. Accounts payable matches the documents. Many businesses use a three-way match, which compares the PO, the receiving record, and the vendor invoice before approving vendor payments.
5. You pay and close the PO. After payment, mark the PO as closed and keep it with your records.

Purchase order vs. purchase requisition vs. invoice: What’s the difference?

Although these documents may appear in the same procurement process, they perform different jobs. Here is a quick comparison outlining how these documents differ.  

A purchase requisition generally stays inside the buyer’s organization and supports the approval process. An approved requisition may lead to purchase order creation. The purchase order then goes to the vendor, while the invoice normally comes back from the vendor later.

What mistakes should you avoid when completing a purchase order?

A few simple errors can create confusion later in the purchasing process. Before issuing a PO, watch for these problems:

• Duplicate PO numbers: Each order should have a distinct reference.
• Incorrect vendor information: Confirm the business name and contact details.
• Vague descriptions: Identify products or services precisely.
• Wrong quantity or unit price: Compare the PO against an approved quote when available.
• Incorrect totals: Recheck calculations, taxes, discounts, and shipping costs.
• Missing delivery details: Include the correct address and expected delivery date.
• Unclear payment terms: Record the agreed terms on the document.
• Missing internal approval: Complete your company’s approval process before sending the order.
• Untracked changes: If the order changes, document the revision rather than relying on an informal verbal update.

Accurate purchase order forms give buyers, suppliers, and finance teams a clearer record of what was agreed and can reduce errors during receiving and payment.

Final thoughts

A well-prepared purchase order protects both the buyer and the vendor. It sets clear expectations, supports accurate vendor payments, and gives your business legal protection if something goes wrong. The process is simple once you follow the same steps every time: gather the details, complete each field, get approval, and keep a record.

You do not need an expensive purchase order system to do this well. With pdfFiller, you can create, fill out, sign, and share purchase order forms from any device and reuse your templates for recurring purchases. Start your free pdfFiller trial and prepare your next purchase order in minutes.

Glossary

• Purchase order (PO): A document a buyer issues to identify goods or services it wants to purchase and the proposed terms of the order.
• PO number: A unique identifier assigned to a purchase order so the transaction can be tracked across ordering, receiving, invoicing, and recordkeeping.
• Purchase requisition: An internal request asking an organization to approve a proposed purchase before a PO is created.
• Line item: An individual product or service listed separately on a purchasing document, usually with its description, quantity, and price.
• Payment terms: Conditions that state when and how payment is expected, such as Net 30, when agreed by the parties.
• Stock Keeping Unit: a unique alphanumeric code assigned by a business to a specific product or product variant for internal inventory tracking.

Trusted sources

• Acquisition.gov — FAR Part 2, Definitions of Words and Terms 
• Acquisition.gov — FAR 13.302-1, Purchase Orders: General
• U.S. House of Representatives — 15 U.S.C. §7001, General Rule of Validity 
• New York State Senate — UCC §2-206, Offer and Acceptance in Formation of Contract
• Internal Revenue Service — About Form W-9