Glossary

The supplier overbilling rate is the percentage of supplier invoices that contain at least one pricing error, where the amount billed exceeds the contractually agreed price, the quantity invoiced differs from what was delivered, or a line item is charged that doesn't correspond to an actual purchase. It is one of the most direct indicators of financial leakage in accounts payable.

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In practice, this rate is almost never measured, because measuring it requires checking every invoice against every negotiated reference, which is precisely the task that manual processes cannot sustain at scale. Teams that do spot-check report rates between 5% and 20% of invoices containing at least one discrepancy. Phacet clients in the food & beverage segment have reported overbilling averaging €400–600 per restaurant per month, invisible until systematically verified.

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The overbilling rate compounds with volume. A company processing 300 invoices per month with a 10% error rate is absorbing 30 incorrect payments per month. Across a multi-site operation growing from 6 to 15 locations, that figure scales mechanically, without anyone noticing, because the control process hasn't scaled with it.

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Measuring and reducing the supplier overbilling rate requires supplier invoice verification at 100% coverage, not sampling. Phacet's AI agents cross-reference every invoiced line against negotiated prices, applying pre-payment controls before any amount is released. The overbilling rate becomes a tracked, reportable metric, not an estimate.

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For F&B operators and retail groups, the ROI calculation is simple: overbilling rate × monthly invoice volume × average invoice value = the annual loss that automated control eliminates.