Check It Out: 2-Way Matching in Accounts Payable

Invoice issues are expensive. Industry data reveals that 4.2% of invoices contain discrepancies, costing companies an average of $180/hour. Price mismatches, duplicate payments, and missing approvals will quietly drain your cash flow and delay the entire procure-to-pay process. The more invoices you add, the greater the problem gets.

This is where 2 way matching in accounts payable can really help out. In this article, we’ll take a look at the PO matching process (2, 3, and 4), a step-by-step guide on how it works, why you need it, and how automation can help accelerate approvals, strengthen controls, and protect your working capital.  

What is 2-Way Matching in Accounts Payable?

2-way matching is a process that compares supplier invoices against their corresponding purchase orders. It verifies key fields like PO number, price, quantity, line items, tax, invoice total, and more. If a value falls within a predefined tolerance level, the invoice is automatically approved. If it doesn’t, the invoice is flagged as an exception and reviewed.

When people ask what is two way matching, the simple answer is that the process confirms what you ordered is what they billed.  

2 way matching in accounts payable is most commonly used for:

• Services
• Subscriptions
• Low-risk purchases  

Any type of transaction that needs minimal oversight and is pretty simple.

Real-World Scenario for 2-Way Matching

One example is a first-time purchase from a new vendor who doesn’t have a track record with your company. Such cases may require additional checks, like a two-way match, to ensure everything is in order, before you approve and initiate payment.

2-way matching is just the beginning of how automated invoice processing can save your business extensive time and money.

3-Way Matching Adds a Layer of Security

If you bring in one more data set to validate an invoice, both accuracy and security increase. A 3-way match compares an invoice not only with a PO, but also with a note of goods received. That third data source ensures that the products or services were indeed ordered, billed, and received as specified.

A modern platform for AP automation can perform 3-way matching in accounts payable very quickly and at scale. It drastically reduces the number of faulty invoices slipping through and speeds up handling the correct ones.

Real-World Scenario for 3-Way Matching

Say your company ordered 100 chairs and was billed for the full amount. However, if you only received 75 of them, a 3-way automated matching process will immediately catch the discrepancy. 

It will flag the issue as an exception and escalate it for review by the Accounts Payable (AP) staff. Only if the numbers match up within the predefined tolerances will that invoice be routed for approval.

4-Way Matching Considers Inspection

Some invoices may require a deeper audit, and that’s where 4-way invoice matching comes in. It compares the details from the invoice, purchase order, and receipt notes, with inspection information tied to quantity and quality.

While 4-way matching is not the standard operating procedure, it can be easily handled by automated invoice processing. That’s because an intelligent platform can read the rules for each invoice and pull all relevant data points to perform precise matching at scale.

Real-World Scenario for 4-Way Matching

A medical device manufacturer orders 500 sensors from an approved supplier, with the PO specifying the exact model, quantity, and regulatory quality standards required for hospital use. 

When the shipment arrives, the team confirms delivery of all 500 units, but a quality inspection reveals that 40 units fail testing and do not meet FDA compliance requirements. 

Since the inspection results do not align with the invoice, the invoice is automatically flagged as an exception and routed for resolution. 4-way matching results in the payment being approved for the 460 accepted units, while a credit is issued for the rejected items. 

The invoice management software saved the business from overpaying for products that did not meet standards. 

When to Use Invoice Matching: A Helpful Chart

If your head is spinning with questions like “What is 2-way and 3-way matching in accounts payable?” or you’re wondering when to use which kind, here’s a quick chart to help you stay organized:

When There’s a Bump in the Road: Invoices That are Rejected

Automated systems are designed to find problems and address them quickly. Invoice matching is no different. When an invoice and the corresponding document do not match (according to the rules you set), then it is flagged as an “exception” and placed on hold for inspection.

What Is a Tolerance Threshold?

To determine whether an invoice makes it or breaks it, you have to set up tolerance thresholds in your system. This is a predefined range of acceptable variance between what the invoice says and what is on the purchase order. It will define just how much of a difference is acceptable and can be auto-approved, and what needs another look. 

For example, a business might allow:

• A price variance of up to 2% to account for rounding or differences in currency
• A quantity variance of “0” for any physical goods (you either receive it or you don’t)
• No tolerance for tax or duplicate invoices

Tolerance thresholds are there to balance efficiency with control. They keep AP teams from having to manually review tiny differences and ensure large issues are immediately flagged for review. 

The more time you spend on configuring these thresholds, the fewer exceptions you’ll have to manage. There will be fewer bottlenecks and faster approvals. 

What is an Invoice Exception?

When it comes to the invoice payment process, an “exception” is triggered when there is an issue with the invoice. This can include various reasons like:

• The quantity billed is different from the quantity received
• Unit price exceeds approved PO
• Tax amounts do not align with expected rates
• Vendor data does not match records
• Duplicate invoice numbers or amounts
• Currency or payment terms differ from the PO

It can catch a wide range of issues, from extra line items to missing data, helping you combat fraud and eliminate duplicate or erroneous payments. 

What Happens After an Invoice Mismatch?

After the system detects an exception, it will automatically:

1. Place the payment on hold (Can’t pay an invoice if it’s wrong).
2. Route the invoice to the appropriate party for review
3. Send notifications of exception to AP staff
4. Display side-by-side comparisons of data in questions 
5. Apply escalation rules (if exception is not resolved)

An efficient AP automation system, such as Yooz, will also log every action for audit and compliance purposes. After the discrepancies are resolved, the invoice is released for payment. 

Best Practices for Exception Resolution

In order to reduce the number of exceptions in your system, here are a few simple rules:

• Define clear tolerance thresholds by risk and spend category
• Use reason codes for every exception to support reporting
• Integrate AP workflows with procurement
• Standardize approvals to avoid bottlenecks
• Track exception cycle times and resolution rates
• Define clear tolerance thresholds by spend category and supplier risk
• Standardize approval paths to avoid bottlenecks
• Use reason codes for every exception to support reporting and root cause analysis
• Integrate AP workflows with procurement and receiving systems
• Track exception cycle time and resolution rates as key performance indicators

Automated vs Manual Exception Workflows: A Simple Chart

Automated exception handling provides significant advantages over manual processes:

Why is Invoice Matching Important?

Humans can’t be everywhere, all at once—but robots can. By simply automating lengthy, manual AP tasks, a business frees up its staff to focus on more innovative projects. 

Here are just a few of the reasons why automation increases your financial efficiency and decreases mistakes:

Fewer Mistakes

Automated two-way matching reduces the need for manual invoice data entry. It can reduce invoice errors by 60-90% by validating prices, quantities, and totals against an approved PO. This significantly lowers duplicate payments, incorrect billing, and unauthorized price changes. 

Faster Processing

Companies using automation can typically cut invoice cycle time by 40-70% and increase the number of invoices processed per AP team member by 2-5x. Fewer manual tasks result in lower processing costs per invoice and a faster approval turnaround. 

Stronger Vendor Relationships

On-time and accurate payments improve vendor trust and reduce the number of disputes. Clear and concise matching with defined exception workflows enables faster resolutions, helping vendors get paid correctly, the first time around. 

Cost Efficiency

Matching invoices to a purchase order catches potential mistakes, duplicates, and fraud attempts early on without tying up precious labor down the road. For organizations suffering from inflation or ongoing supply chain hiccups, anything that improves cost efficiency is at the forefront of their minds. AP automation processing helps keep the cost pressures in check.

Increased Visibility

2-way matching increases visibility across the entire organization throughout the procure-to-pay cycle. Automated invoice processing generates a continuous stream of real-time financial intelligence and makes it available in a single central place.

Additional Benefits:

• Improved compliance and expedited approvals
• Audit readiness for external financial reviews
• Improved cash forecasting accuracy and predictive analytics

The key to all this is taking steps to consistently ensure that what you’re billed for on the invoice matches what you actually ordered.  

When Invoice Matching Doesn’t Work

Although invoice matching is a powerful control, it’s not always the silver bullet. There are times when matching fails to deliver accurate results or creates new issues and bottlenecks. It can break down when invoices lack clean data, such as missing PO numbers or inconsistent vendor details. This is typically the vendor’s responsibility and can be corrected with clear communication.

Invoice matching cannot verify quality or performance, only that prices and quantities match. If you are dissatisfied with a service, the system will not know that. Again, speaking up can resolve this issue. 

One-off purchases or contracts without formal purchase orders will often require manual review. Finally, poorly set tolerance thresholds will result in too many false exceptions or allow errors to slip through.

Summing it Up: 2 Way Matching is a Smart Move

Every invoice that slips through the cracks, snowballs into a larger issue. Invoices with incorrect prices, quantities, or approvals drain cash flow, pose compliance risks, and signal that manual controls can’t keep pace with modern transaction volumes. 

As your invoices grow, small mismatches quickly compound into late payments, duplications, audit exposure, and an unnecessary strain on AP teams.

2-way, 3-way, and 4-way matching give finance teams an easy way to control errors. With the right level of matching and automation, invoices are validated before money ever leaves the table, exceptions are resolved quickly, audits are smoother, and working capital is more predictable. 

Instead of a reactive approach, companies can prevent problems upstream, enabling a faster and more accurate procure-to-pay process. 

All of this means that invoice matching is no longer just an AP task. It’s a core financial control that safeguards your revenue, strengthens business relationships, and supports efficient growth. Because when accuracy becomes automated, finance teams stop reacting to problems and start preventing them.

Ready to crush 2-way matching for your business? Watch how Yooz can streamline your invoice matching and exception handling with a personalized demo.