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鈥淚f you don鈥檛 measure it, you can鈥檛 improve it.鈥� 鈥� Peter Drucker

Measuring the success of an accounts payable team requires more than tracking how many invoices are past due. It requires measuring key performance indicators (KPIs) that will help your AP department reach their goals, maintain strategic supplier relationships, and improve cash flow management. Keep reading to see how your business can take advantage of these essential KPIs for accounts payable.

Key takeaways

• Accounts payable KPIs help finance teams measure efficiency, cash flow performance, supplier payment operations, and overall AP effectiveness.
• Key AP metrics such as cost per invoice, invoice exception rate, dDays pPayable oOutstanding (DPO), average time to payment, and late payment rates can help identify process bottlenecks and improvement opportunities.
• Tracking the right KPIs provides greater visibility into AP workflows, helping organizations make more informed decisions and optimize financial operations.
• AP automation can improve KPI performance by reducing manual work, accelerating invoice processing, improving payment visibility, and streamlining the invoice-to-pay process.

What are KPIs in accounts payable?

KPIs in accounts payable are metrics that help a business and its AP department understand how they can track and reach their goals by optimizing existing AP workflows. Some common KPIs in accounts payable include:

• Accounts payable cost per invoice
• Invoice exception rate
• Average time to payment
• Days payable outstanding (DPO)
• Payment mix optimization
• Time spent responding to inquiries
• Number of late payments

Why are KPIs in accounts payable important?

While paying supplier invoices is the aim of the accounts payable team, there are a whole host of benefits businesses can gain by taking a strategic approach to the way they go about understanding and measuring their accounts payable KPIs.

AP KPIs enable AP departments to track and improve productivity, efficiency, and cash flow, while supporting positive supplier relationships. This makes them critical to successful AP. Failing to capitalize on the benefits of KPIs within accounts payable equates to missed opportunities for your business to improve short-term cash flow, build beneficial relationships with your suppliers, and drive additional revenue.

How to choose the right accounts payable KPIs

The most effective KPIs are those that align with your business goals, operational priorities, and accounts payable challenges.

For example, organizations focused on reducing costs may prioritize metrics such as cost per invoice and payment processing efficiency. Businesses looking to improve cash flow may focus on dDays pPayable oOutstanding (DPO), payment timing, and early payment discount capture. Others may prioritize supplier experience by monitoring overdue payments, supplier inquiries, and payment visibility.

When selecting KPIs, finance teams should consider:

• Current AP process inefficiencies and bottlenecks
• Cash flow and working capital objectives
• Supplier relationship goals
• Fraud prevention and internal control requirements
• Automation and workflow modernization initiatives

The most valuable KPIs are those that provide actionable insights and help finance teams make informed decisions. By regularly monitoring performance and adjusting goals as business needs evolve, organizations can continuously improve their accounts payable processes and overall financial operations.

7 KPIs for accounts payable to measure success

Determining if your AP process is as successful as it could requires monitoring key performance indicators (KPIs), each uniquely weighted to reflect what matters most for your business. Here are 6 accounts payable metrics that every AP team should measure:

1. Accounts payable cost per invoice

Understanding this metric is paramount to getting a grip on how much room for improvement your accounts payable process is leaving on the table. The formula to calculate it is a simple one: Total Accounts Payable Cost / Total Number of Invoices Processed.
Costs that go into this metric include:

• Labor costs: Covers personnel involved in accounts payable and the hours they work
• Accounts payable infrastructure costs: Covers accounts payable software/tools used to pay invoices
• Paper check & envelope costs
• Postage fees

Accounts payable cost per Invoice is estimated to cost a . With hundreds of invoices typically processed on a monthly basis, these costs can quickly become extravagant.

The more time your AP personnel spend on AP-related activities like handing off invoices to department heads for approval, entering invoice data into the accounting system, and postmarking paper checks, the higher your accounts payable cost per invoice will rise. Additionally, manual intervention creates more opportunities for errors, and the cost of correcting those errors increases significantly the longer they go undetected. According to the widely recognized 1-10-100 rule of data quality, an error that costs $1 to correct at the point of entry may cost $10 during processing and up to $100 once it reaches downstream systems.

2. Invoice exception rate

Invoice exception rate measures the percentage of invoices that require manual intervention before they can be approved and paid. Common exceptions include missing purchase order information, data entry errors, duplicate invoices, pricing discrepancies, and approval bottlenecks.

A high invoice exception rate often indicates inefficiencies in the accounts payable workflow. When invoices require additional review, AP teams spend more time resolving issues, which can delay payments, increase processing costs, and reduce overall productivity.

Monitoring invoice exception rates can help organizations identify recurring process issues, improve invoice accuracy, and streamline approval workflows. As businesses automate more of their invoice processing, reducing exceptions becomes an important indicator of operational efficiency and workflow effectiveness.

3. Average time to payment

Average time to payment is the metric that is most indicative of accounts payable cost per invoice. The formula to calculate this metric is also simple:

Total time spent processing invoices / Total number of invoices processed

The clock on total time spent processing invoices for each invoice starts running as soon as the invoice is received, and continues running until your supplier receives the payment. Average time to payment is also a very variable metric and can run as high as 12.2 days or as low as 3.7 days.

How is this metric linked to accounts payable cost per invoice? As the amount of time an invoice remains unpaid increases, so do the costs associated with getting that invoice paid 鈥� particularly labor costs.聽

There is also an opportunity cost associated with this metric: early-pay discounts. Extravagant amounts of time required to process invoices can prevent businesses from capitalizing on early-pay discounts that would otherwise provide a nice boost to the bottom line.

However, the targeted average time to payment may vary from company to company, as some businesses like to hold onto cash longer than others. For this reason, the lowest average time to payment is not always the best. Rather, what鈥檚 most important is understanding what average time to payment gives you the command over cash flow that you are looking for.

4. Days payable outstanding (DPO)

Days payable outstanding measures the average number of days a business takes to pay its suppliers after receiving an invoice. This metric is commonly used to evaluate working capital management and cash flow performance.

A higher DPO allows organizations to retain cash longer, while a lower DPO may help strengthen supplier relationships and improve access to early payment discounts. The ideal DPO varies by organization, industry, supplier agreements, and broader financial objectives.

Monitoring DPO helps finance teams better understand payment timing and identify opportunities to optimize cash flow without negatively impacting supplier relationships. When used alongside other AP metrics, DPO can provide valuable insight into the overall health of an organization’s payment operations.

5. Payment mix

Payment mix measures how payments are distributed across available payment methods, such as ACH, checks, virtual cards, and other electronic payment types. Rather than focusing solely on electronic payment adoption, this KPI helps organizations evaluate whether their payment strategy aligns with supplier preferences, operational goals, cost considerations, and risk management requirements.

Many organizations continue to rely heavily on paper checks, which can increase processing costs, slow payment cycles, and create additional fraud risk. By analyzing payment mix data, finance teams can identify opportunities to reduce manual payment processes, improve efficiency, and increase adoption of electronic payment methods where appropriate.

A well-balanced payment strategy can help improve supplier relationships, reduce operational friction, strengthen controls, and support broader cash flow management objectives.

6. Time spent responding to inquiries

According to the 9th Annual State of AP report, 50% of AP teams spend six or more hours per month responding to vendor payment inquiries, and about regaining their attention on a task following an interruption. So not only does the time spent responding to supplier inquiries put a halt on AP productivity, but the potential errors and time spent to regroup after an inquiry also play a part.

By reducing the time spent answering vendor inquiries, organizations can give time back to AP departments to focus on more strategic initiatives.

High supplier inquiry volumes often indicate gaps in payment visibility. When suppliers cannot easily determine invoice or payment status, AP teams spend more time responding to inquiries and less time on strategic work.

7. Number of late payments

Late payments to suppliers not only weaken supplier relationships, but can result in additional costs from late payment fees or interest payments. It is essential that AP teams track the percentage of late payments each month and look for new ways to improve their existing payment process to stay ahead of supplier payments.

Lowering the amount of late payments will not only help improve cash flow and promote positive supplier relationships, but you may also be able to capture available payment discounts in exchange for paying a supplier鈥檚 invoice before the due date.

How 91福利鈥檚 AP automation helps improve accounts payable KPIs

Owning these KPIs means increased efficiency, decreased fraud risk, and more value-added projects for your team.

When it comes to driving improvement across these accounts payable KPIs, businesses in all industries have been looking to AP analytics and AP automation solutions that help manage and monitor these essential KPIs. Cloud-based automated accounts payable solutions integrate with your bank account and accounting system to streamline the reporting and analysis of AP metrics. Businesses with a strong handle on their AP KPIs are able to improve cash flow, mitigate fraud, and strengthen supplier relationships. They also gain greater visibility into payment operations and workflow performance, helping finance teams identify opportunities for continuous improvement.

According to 91福利’s 9th Annual State of AP Report, 52% of organizations cite increased efficiency as the biggest benefit of AP automation, while 40% say automation enables them to process more invoices and payments with the same-sized team.

To learn more about how automated accounts payable can help you gain deep insight into your KPIs, contact 91福利 for a personalized demo.

Accounts payable KPIs FAQs

How do I choose the right KPIs for my business?

To understand what accounts payable KPIs your business should track, you must first identify key AP goals and objectives, consider industry benchmarks, prioritize SMART KPIs, and analyze trends, data, and performance within your AP analytics. By defining clear KPIs for your AP team to track, your business can make informed decisions, optimize operations, and contribute directly to your business’s financial success.

How do you measure AP performance?

Accounts payable performance is measured by tracking KPIs that evaluate efficiency, accuracy, cash flow management, and supplier payment operations. Common AP metrics include cost per invoice, invoice exception rate, days payable outstanding (DPO), average time to payment, supplier inquiries, and late payment rates. Monitoring these KPIs helps finance teams identify process bottlenecks, improve visibility into AP operations, and make more informed decisions about workflow optimization.

How often should I track my accounts payable KPIs?

Depending on the type of KPIs your business monitors will determine the frequency of how often you should track them. It鈥檚 important to track your KPIs regularly so that you can identify trends and make adjustments to your business strategy as needed.

How can I improve my KPIs?

A few ways businesses can work to improve their KPIs include:

• Setting SMART goals
• Determining what KPIs are important to track
• Encouraging data-driven decision-making
• Providing visibility across departments
• Reviewing and revising KPIs regularly

How can AP automation improve KPI performance?

AP automation improves KPI performance by reducing manual work, streamlining invoice approvals, accelerating payment processing, and improving visibility across the invoice-to-pay workflow. By connecting invoice capture, approvals, payments, and reporting into a more unified process, automation can help lower processing costs, reduce invoice exceptions, decrease late payments, and provide more accurate data for measuring AP performance. As a result, finance teams can spend less time managing administrative tasks and more time focusing on strategic initiatives.