PO Aging

In one sentence: PO aging measures the elapsed time between when a purchase order is created and when it is fully received, invoiced, and closed, highlighting orders that remain open longer than expected.

What Is PO Aging?

A purchase order (PO) is "open" from the moment it's issued until all ordered items are received, matched against invoices, and the PO is closed. PO aging reports track how long each PO has been open and flag those that exceed expected timeframes.

A healthy PO lifecycle is predictable: order placed, goods received within the lead time, invoice matched within days, PO closed. When POs remain open for weeks or months beyond their expected delivery date, it signals a problem, either operational (goods not received, invoices missing) or procedural (nobody is closing completed POs).

Why It Matters

Open POs aren't just administrative clutter. They have direct financial consequences:

• Distorted accruals: Open POs represent commitments that may need to be accrued. Stale POs inflate accrual balances and misrepresent outstanding liabilities.
• Budget inaccuracy: Encumbered funds tied to aging POs reduce available budget even when the spend is unlikely to occur.
• Audit findings: Auditors flag large volumes of aged POs as a control weakness, questioning whether the company can accurately state its obligations.
• Matching failures: When invoices arrive months after the PO was created, 3-way matching is more likely to fail due to price changes, partial deliveries, or personnel turnover.

How It Works

PO aging is typically measured in aging buckets, similar to accounts receivable aging:

• 0-30 days: Normal; within expected delivery and invoicing cycle.
• 31-60 days: Monitor; may indicate delivery delays or missing invoices.
• 61-90 days: Investigate; contact the vendor or internal requester for status.
• 90+ days: Action required; close, cancel, or document the reason for delay.

Finance teams review PO aging reports weekly or monthly, prioritizing investigation of high-value aged POs. The goal is to keep the majority of POs in the 0-30 day bucket and maintain a clear trail for anything older.

Common Problems

• No one owns the cleanup. Procurement creates POs, AP matches invoices, but nobody is accountable for closing stale POs in the gap between.
• Partial receipts create permanent open POs. When 95% of an order is received but the last 5% never ships, the PO stays open indefinitely.
• Manual tracking in spreadsheets. Without automated aging reports, stale POs accumulate silently until month-end or audit.
• Cultural resistance to closing POs. Teams keep POs open "just in case" the vendor sends a final invoice, creating a growing backlog of zombie POs.

FAQ

What is a healthy PO aging profile?

A well-managed AP function typically has 70-80% of POs in the 0-30 day bucket, with less than 10% exceeding 90 days. Companies with significant POs in the 90+ day bucket should investigate root causes: vendor delivery issues, missing GRNs, or process gaps between procurement and AP.

How does PO aging affect month-end close?

Aged POs require accrual adjustments: finance must estimate the liability for goods or services that were ordered but not yet invoiced. A high volume of aged POs makes these estimates less accurate and adds manual work to the close process.

Should old POs just be cancelled?

Not automatically. Each aged PO should be investigated before closure. Some represent legitimate open orders (e.g., long-lead-time equipment). Others represent completed transactions where the PO was never formally closed. Cancelling without review can create problems if a vendor invoice arrives later with no PO to match against.