Cross-aging: when one customer's late invoices take out the current ones

The plain aging cutoff treats each invoice on its own. Cross-aging asks a sharper question: is this customer still paying? When a meaningful share of an obligor's balance goes past the cutoff, lenders stop trusting the current invoices too, because the same cash flow problem or dispute that stalled the old invoices is usually coming for the new ones.

Most agreements set the threshold at 25 or 50 percent of the obligor's total balance, measured against the same aging cutoff used elsewhere in the facility, typically 90 days from invoice date. ABL facilities lean toward 25 percent; some factoring and securitization structures use 50. The threshold and the measurement basis, gross balance or open balance, come from your agreement.

Group all open invoices by obligor, measure the share past the cutoff, and compare it to the threshold. Cross the threshold and the whole balance becomes ineligible, not just the late portion. Here is one customer tested under a 25 percent threshold.

Without cross-aging, only the $300,000 of aged invoices would fall out. With it, the full $1,000,000 is excluded, an extra $700,000 of ineligibles. At an 85 percent advance rate that is $595,000 of availability lost to invoices that are individually current. This is the rule that surprises controllers most, because a single slow paying customer can move the borrowing base by seven figures overnight.

Cross-aging needs invoice date, due date, open amount, and critically a reliable obligor id. The invoice level inputs are the same as the aging test. The obligor grouping is where it breaks. If Brackford Manufacturing exists as three customer records across your business units, each record might individually sit under the threshold while the real combined customer is well over it. Most agreements measure at the obligor or obligor group level, so fragmented customer masters understate cross-aged ineligibles.

Credit memos and unapplied cash parked in old aging buckets are the other failure mode. A $200,000 unapplied payment sitting in the over 90 column can push a healthy customer over the threshold, or hide a genuinely troubled one, depending on where it lands.

• Invoices are grouped to normalized obligors before the ratio is measured, so fragmented customer records cannot hide a cross-aged customer.
• The threshold, the aging convention, and whether the test runs on gross or open balances are configured per facility to match the agreement.
• The test is deterministic and ordered correctly against the other rules, since cross-aging typically runs before concentration is measured.
• Every cross-aged exclusion shows the obligor's full aging, the computed ratio, and the specific invoices that pushed it over, so the deduction is defensible in a field exam.