Contra accounts: when your customer is also your supplier

If your customer owes you $800,000 and you owe them $500,000, they do not have to write you a check for $800,000. In a dispute, a bankruptcy, or just a hardball negotiation, they can set off the payable and settle for $300,000. From the lender's seat, $500,000 of that receivable was never really collateral, because a right of setoff sits ahead of the lender's claim on the cash.

This shows up constantly in supply chains where trading is genuinely two way: a food producer buying packaging from the same distributor it sells to, a manufacturer with tooling charges flowing back from its customer, marketing co-op arrangements, and rebate programs. The exposure is real even when both sides are paying on time.

Most agreements exclude receivables from a contra counterparty up to the lesser of the AR and the AP. Match counterparties across both ledgers, net the exposure, and only the excess AR stays eligible.

The $500,000 exclusion costs $425,000 of availability at an 85 percent advance rate. Some agreements are stricter and exclude the counterparty's entire balance once any material contra exists, and some are looser and only count AP that is currently due. A few carve out payables under a negotiated floor, for example $25,000, to avoid noise.

This is the only eligibility rule that needs your AP ledger, and that is exactly why it breaks. You need obligor id and open amount from AR, vendor id and open amount from AP, and a way to recognize that customer 10442 and vendor V-2913 are the same legal entity. They almost never share an identifier, and the names rarely match: the AR side says Delvane Logistics Inc while the AP side says DELVANE LOG. Matching on tax id helps when you have it; name normalization does the rest.

Timing is the second failure mode. The AR snapshot and the AP snapshot have to be cut as of the same date. A contra figure built from month end AR and mid month AP is a number nobody can reconcile, and field examiners pull both ledgers to check.

• AR obligors and AP vendors are matched to the same normalized counterparty before netting, so contra exposure is not hidden by naming differences.
• The netting method is configured per facility: lesser of AR and AP, full balance exclusion, due only payables, or a materiality floor, whichever your agreement uses.
• The calculation is deterministic and both snapshots are taken as of the same report date.
• Every contra deduction traces to the specific AP balances and source rows behind it, so the number on the certificate reconciles to both ledgers.