Invoice/payment matching, also called accounting lettrage or payment reconciliation, is the process of linking each outgoing payment to the specific invoice it settles, and marking both as reconciled in the general ledger. It is one of the foundational tasks of accounts payable management, and one of the most time-consuming to perform manually at scale.
In a clean workflow, the process is straightforward: invoice received, payment issued, both entries matched, account closed. In reality, it breaks down quickly. Partial payments leave invoices partially open. A single wire covers multiple invoices. Payment references don't match invoice numbers. Supplier statements include items from multiple periods. Foreign currency payments add conversion complexity. Each of these scenarios requires manual investigation to resolve, consuming hours that scale directly with invoice volume.
The cost of unresolved matching is twofold: outstanding invoices remain open on the balance sheet, distorting supplier balance aging reports; and the finance team loses visibility on what is genuinely unpaid versus what is simply unmatched. In multi-entity or multi-site structures, the problem multiplies across each legal entity.
Phacet's bank reconciliation automation and payment matching capabilities apply semantic matching logic to automatically reconcile payments against invoices, handling partial payments, consolidated wires, and reference mismatches without manual intervention. Matched items are flagged as reconciled; unmatched items are escalated as exceptions for human review.
For accounting firms and finance ops teams processing hundreds of invoices per month, automated lettrage reduces the month-end reconciliation workload by 60–80%, and ensures that supplier balance aging always reflects reality, not a backlog of unmatched transactions.
