Xero Purchase Orders: A Practical Guide to Controlling Spend

The Problem Purchase Orders Actually Solve

In most small businesses, spending control works backwards. A staff member orders materials, the supplier delivers, an invoice arrives three weeks later, and only then does anyone find out what it cost. If the price was wrong, the quantity was wrong, or the order should never have been placed, you are arguing about it after the money is effectively committed.

A purchase order moves the decision point earlier. It is a document you issue to a supplier stating exactly what you are ordering, at what price, and on what terms, before anything is delivered. When the supplier's bill arrives, you compare it to the order. If they match, you pay. If they do not, you have a written record of what was agreed.

Xero includes purchase orders on all plans at no extra cost, and they are one of the more underused features in the platform. This guide covers setting them up, running them day to day, and the mistakes that turn them into a paperwork exercise instead of a control.

When Purchase Orders Are Worth the Effort

Purchase orders add a step. That step is worth it when:

• More than one person can commit company money. Once staff order materials or subcontractors, you need approval before the spend, not after.
• You buy on account from regular suppliers. Trade accounts at building supply, parts, or wholesale suppliers are where quantity and pricing disputes happen most.
• You need to attribute costs to jobs. An order can carry the job or tracking category from the outset, so the cost lands in the right place automatically.
• You order goods that arrive in stages. Partial deliveries are far easier to track against an order than against a pile of delivery dockets.

They are less useful for a sole trader buying the occasional item on a card. If every purchase is a decision you make personally, the overhead outweighs the control.

Setting Up Purchase Orders in Xero

Step 1: Find Them and Set Your Numbering

Purchase orders live under the Business menu. Before you create your first one, set the prefix and starting number in purchase order settings. Something like "PO-" followed by a sequential number is fine. Do not start at 1 if you have been issuing orders by email or on paper, because duplicate references across systems create confusion with suppliers.

Step 2: Customise the Template

Under organisation settings, invoice settings, you can brand the purchase order template. Two fields matter more than the logo. The delivery address needs to be correct, because suppliers work off what is printed on the order. If you deliver to varying job sites, leave it blank and fill it per order, because a materials delivery sent to head office instead of site is an expensive mistake. Second, the terms section is where you state the condition that the invoice must quote the purchase order number. That single line prevents a lot of unmatched bills.

Step 3: Decide Who Can Approve

Xero user roles control this. Staff who raise orders can be given a role that lets them create but not approve, so nothing reaches a supplier without a second set of eyes. This is the entire point of the feature, so do not give everyone approval rights and then wonder why spending is still uncontrolled.

Running Purchase Orders Day to Day

Raise the Order Before You Commit

The order should be issued and approved before you ring the supplier, not written up afterwards to tidy the paperwork. A retrospective purchase order is a record, not a control.

Fill In the Detail That Matters

Line-level detail is what makes the later matching work. For each line, enter the description, quantity, unit price, account code, and tax rate. If you use tracking categories or Xero Projects, assign them on the order itself, so the cost is attributed the moment the bill is created rather than recoded later.

Send It From Xero

Emailing the order from inside Xero records that it was sent and when, and gives the supplier a document carrying your purchase order number, which is what you need them to quote back on the invoice.

Convert the Order to a Bill

When the supplier's invoice arrives, open the purchase order and use the option to copy it to a bill. Xero carries across the lines, coding, and any tracking or project assignment. Then check the bill against the order line by line: quantities, prices, and any freight or surcharge the supplier has added. Adjust the bill to match what was actually delivered and agreed, and query anything that does not reconcile.

Close Orders Off

Xero tracks the status of each order: draft, awaiting approval, approved, billed, or deleted. Review the approved list regularly. An order sitting approved for two months either means a delivery never arrived or a bill was entered separately without being matched, and both are worth knowing about.

Purchase Orders Versus Quotes and Bills

These three documents are easy to confuse:

• A quote goes out to your customer, offering to do work at a price. Revenue side.
• A purchase order goes out to your supplier, committing to buy at a price. Cost side.
• A bill is what the supplier sends you, and it creates the actual liability in your accounts.

A purchase order does not affect your profit and loss or your GST position. Nothing hits the books until it becomes a bill. That is why it is a safe control point: you can approve, amend, or cancel an order without touching your financial records.

Common Mistakes

• Raising orders after the fact so the paperwork looks complete, which removes every benefit.
• Giving all staff approval rights, so there is no second review before money is committed.
• Leaving the order number off supplier invoices, which makes matching manual and slow.
• Not checking the bill against the order, so price creep flows straight through to payment.
• Never closing out old approved orders, leaving a list nobody trusts or uses.

How SortBooks Fits

Purchase orders only deliver value if the resulting bills and payments are coded accurately and reconciled promptly. If supplier bills sit in draft for a month and your bank feed is unreconciled, you cannot tell which orders have been fulfilled or what your committed spend actually is.

SortBooks connects to your Xero file and handles the categorisation layer, suggesting the account and GST code for each transaction based on your history, with nothing written back until you approve it. That keeps the cost side of your file current, so comparing what you ordered against what you were billed takes minutes instead of waiting until quarter end.

Final Thoughts

In a one-person business, purchase orders can be overkill. But the moment more than one person can spend company money, they are the cheapest spending control available to you, and in Xero they are already included in the plan you pay for.

Set the numbering, restrict approval rights, put the order number requirement in your template terms, and check every bill against its order. Do that for a quarter and the price creep you have been absorbing without noticing will start showing up before you pay for it.