
Visa's VAMP Is Live: How Small Merchants Stay Under the 0.9% Chargeback Threshold in 2026
Visa's Acquirer Monitoring Program (VAMP) merges TC40 fraud reports and TC15 disputes into one ratio, and the 2026 merchant "excessive" threshold dropped to 0.9%. This guide shows exactly how the ratio is calculated and gives small merchants a prevention and gross-to-net bookkeeping playbook to stay under it.










