Purchase order best practices for 2026 finance teams (Malaysia guide)

Key takeaways:

• Purchase orders work best when approval limits reflect your budget structure and every approver has a designated backup.

• Under MyInvois, a mismatch between the purchase order, invoice, and goods received may require a validated e-invoice to be cancelled and reissued within LHDN's 72-hour window.

• Airwallex Purchase Orders helps Malaysian finance teams manage the entire purchasing workflow, from request and approval to invoice matching and payment.

Purchase order best practices help finance teams control spending before it happens, rather than trying to fix problems after an invoice arrives.

As Malaysian businesses grow, manual approvals, inconsistent purchasing processes, and MyInvois compliance requirements make a structured purchase order workflow increasingly important.

This guide covers the purchase order best practices every Malaysian finance team should follow in 2026, from approval workflows and three-way matching to supplier management and automation.

If you need a refresher on POs and how they work, read our article What is a purchase order? first.

Best practice 1: Use three-way matching to resolve purchase order mismatches

Three-way matching is one of the most effective controls in the purchase order process. Before approving payment, finance compares three documents:

• The purchase order (what was ordered)

• The delivery order or goods received note (what was received)

• The supplier invoice (what was billed)

When all three match, the invoice can move through the approval process. When they don't, someone needs to investigate before payment is released.

Most mismatches fall into a few common categories:

Not every mismatch requires the same response.

Many finance teams define tolerance thresholds for small differences, such as minor rounding variances or freight adjustments, so low-risk invoices don't become unnecessary bottlenecks. Larger discrepancies should always be reviewed before payment is approved.

This becomes even more important under MyInvois. If a supplier has already validated an e-invoice with LHDN and a material error is discovered afterwards, the supplier generally has 72 hours to cancel and reissue the e-invoice.

After that, corrections typically have to be made using a credit note, debit note, or refund note instead.¹

For that reason, purchase order mismatches shouldn't sit in an approval queue for days. Give every exception a clear owner, define when finance can approve a variance and when it must be escalated, and resolve discrepancies as early as possible. The faster mismatches are identified, the less likely they are to delay supplier payments or create extra work for both your finance team and your vendors.

Best practice 2: Build a purchase order approval workflow that scales with your business

A scalable approval workflow balances speed with control. Instead of relying on a single approver or a flat spend table, approvals should reflect both the value and nature of the purchase.

Here’s an example:

The exact thresholds will vary by business, but a few principles apply regardless of company size.

Don't rely on spend limits alone

Purchase value is only part of the picture. Some purchases carry greater financial or operational risk regardless of cost.

For example, a RM3,000 software subscription that processes customer data may require finance or IT approval, while a RM10,000 office furniture purchase may only need departmental approval.

Consider the total commitment

Recurring purchases should be approved based on their total value, not just the monthly payment.

A RM500 monthly subscription represents a RM6,000 annual commitment. Looking only at the monthly cost can result in recurring spend being approved at a lower level than intended.

Plan for approver absences

Every approval level should have a designated backup approver.

Requests often stall simply because the primary approver is on leave or travelling. Clear delegation rules keep purchases moving without encouraging employees to bypass the approval process.

Review your approval matrix regularly

Approval limits shouldn't be set once and forgotten. As budgets, headcount, and purchasing patterns change, thresholds that worked for a 30-person business may no longer be appropriate for a company with multiple departments or legal entities.

Reviewing your approval matrix annually helps ensure it still reflects how your business operates.

Best practice 3: Keep supplier records accurate to improve purchase order matching

Even the best purchase order process breaks down if your supplier information isn't accurate.

Duplicate supplier records, inconsistent naming, or outdated tax details make it harder to match purchase orders with invoices and can create unnecessary delays during invoice processing.

A good starting point is to maintain one record for each supplier. That record should include:

• Legal business name

• SSM registration number

• Tax Identification Number (TIN)

• SST registration number (where applicable)

• Verified bank account details

• Primary contact details

For example, if the same supplier appears in your system as ABC Trading Sdn. Bhd., ABC Trading, and A.B.C Trading, your finance team may end up creating multiple purchase orders for what is actually the same business.

Besides making reporting less reliable, duplicate records also increase the risk of paying the wrong supplier or matching invoices to the wrong purchase order.

Also, restrict free-text fields wherever possible. Let employees choose suppliers, cost centres, and GL codes from approved lists instead of typing them manually. Small data-entry errors can create unnecessary work later, especially when invoices need to be matched and reconciled.

Best practice 4: Track committed spend, not just actual spend

Once a purchase order is approved, your business has committed to spending that money, even if the invoice hasn't arrived yet.

If you only track invoices that have been received and paid, your budget reports won't show the full picture. Finance may think there's money available when a large portion of the budget has already been committed through open purchase orders.

Here’s an example:

If you looked only at actual spend, it would appear that RM340,000 remains. In reality, RM300,000 has already been committed, leaving only RM40,000 available for new purchases.

Monitor commitments in real time

Committed spend should be updated as soon as a purchase order is approved, not when the supplier invoice arrives.

This gives department managers and finance teams a more accurate view of available budget and helps prevent accidental overspending.

Don't overlook foreign currency exposure

For businesses buying from overseas suppliers, there's another layer to consider. If you approve a purchase order in USD or EUR but won't pay the invoice for several weeks, exchange rate movements can increase the final cost before payment is made.

Tracking committed spend alongside the purchase currency gives finance better visibility into potential FX exposure before invoices fall due.

Compare budget, committed spend, and actual spend together

The most useful budget reports show all three figures side by side:

• Budget allocated: what has been approved for the period.

• Committed spend: approved purchase orders that haven't yet been invoiced.

• Actual spend: invoices that have been received and paid.

Looking at these together helps finance teams make better purchasing decisions throughout the month instead of discovering budget overruns at month-end.

Best practice 5: Review and continuously improve your purchase order process

Even with a documented purchase order process, the same problems tend to appear over time. Here are some of the most common mistakes Malaysian finance teams should watch for:

Treating purchase orders as a finance-only process

A purchase order workflow only works if every department follows it. If employees see it as "finance paperwork", they'll find ways around it.

Department heads should help define approval rules and be accountable for following them. Purchasing controls are much easier to enforce when they're owned by the business, not just finance.

Raising purchase orders after work has started

A purchase order should be approved before goods are ordered or services begin.

Creating a PO after receiving an invoice defeats the purpose of the process. Finance loses visibility over committed spend, approvals become retrospective, and unauthorised purchases are much harder to challenge.

Letting exceptions become the norm

Most finance teams occasionally make exceptions for urgent purchases. The problem starts when "urgent" becomes the default.

Review exception requests regularly. If the same type of purchase repeatedly bypasses the normal workflow, it's usually a sign that the approval process needs to be updated rather than ignored.

Reviewing your process only when something goes wrong

Purchase order policies shouldn't only be revisited after an audit finding or payment dispute.

As your business grows, review your approval limits, supplier records, and purchasing workflows regularly to make sure they still reflect how the business operates. Small adjustments made over time are far easier than redesigning the process from scratch.

How Airwallex helps you manage the PO process

Following purchase order best practices is much easier when your approvals, purchasing, invoice processing, and payments all happen in the same system.

Airwallex Purchase Orders connects the entire purchasing workflow, so you spend less time chasing paperwork and reconciling transactions. Here’s what you can do with Airwallex:

Build approval workflows without manual follow-up

Create approval workflows based on spend amount, department, entity, or other custom rules. If an approver is unavailable, delegated approvals help keep requests moving without bypassing your purchasing policy.

Match purchase orders and invoices automatically

When supplier invoices arrive, Airwallex uses AI-powered OCR to capture invoice data and match it against the relevant purchase order.

Configurable matching tolerances automatically clear minor differences while flagging larger discrepancies for review, reducing manual checking and helping finance resolve exceptions sooner.

Keep purchasing and payments connected

Once an invoice is approved, finance can pay suppliers from the same platform instead of exporting payment files or logging into separate banking portals.

Pay Malaysian suppliers using local payment rails, or pay overseas suppliers in multiple currencies while keeping every purchase order, approval, invoice, and payment linked in a single audit trail.

See committed and actual spend in one place

Because purchase requests, purchase orders, invoices, and payments are connected, finance teams can monitor committed spend alongside actual spend and make purchasing decisions using a more complete view of their budgets.

Frequently asked questions (FAQs)

What are purchase order best practices?

Purchase order best practices are the processes and controls that help businesses manage purchasing consistently and reduce unnecessary spending. These include setting clear approval workflows, maintaining accurate supplier records, tracking committed spend, performing three-way matching before payment, and reviewing the process regularly as the business grows.

How often should purchase order approval limits be reviewed?

Most businesses should review their approval limits at least once a year, or whenever there are significant changes to budgets, organisational structure, or purchasing responsibilities. Approval limits that worked for a smaller business may no longer be appropriate as headcount and spending increase.

What happens if an invoice doesn't match the purchase order?

If an invoice doesn't match the purchase order, finance should investigate the discrepancy before payment is approved. Depending on the cause, this may involve updating the purchase order, requesting a corrected invoice from the supplier, or confirming that the goods or services were received as ordered.

If the supplier's e-invoice has already been validated through MyInvois, any correction must follow LHDN's cancellation and credit note requirements.

Why is tracking committed spend important?

Committed spend represents the value of approved purchase orders that haven't yet been invoiced or paid. Tracking it alongside actual spend gives finance teams a more accurate view of available budget and helps prevent departments from overspending before invoices arrive.

What information should every supplier record include?

Supplier records should include the supplier's legal business name, SSM registration number, Tax Identification Number (TIN), SST registration number (where applicable), verified bank account details, and up-to-date contact information. Keeping this information consistent helps reduce invoice matching issues and duplicate supplier records.

Can purchase order approvals be automated?

Yes. Many purchase order systems let businesses automatically route requests based on factors such as purchase value, department, entity, or spend category. Automation helps reduce manual follow-up while ensuring purchases are reviewed by the appropriate approvers before an order is placed.

What should you look for in purchase order software?

Look for software that supports configurable approval workflows, automated purchase order and invoice matching, real-time visibility of committed spend, and integrations with your accounting software. If you purchase from overseas suppliers, multi-currency payments and strong audit trails are also valuable features.

Sources:

1. https://www.hasil.gov.my/en/e-invoice/reference-for-the-implementation-of-e-invoice/guidelines/

2. https://mysst.customs.gov.my/registerbussiness

3. https://www.eperolehan.gov.my/en/online-registration