The short answer
A chargeback threshold is a limit set by a card network (Visa, Mastercard, Amex, Discover) on how many disputes a merchant can receive relative to their total transaction count. Exceeding a threshold triggers progressively harsher consequences: surveillance programs, per-chargeback fines, forced reserves, acquirer termination, and placement on the MATCH list.
The three thresholds that matter
Visa VAMP (Visa Acquirer Monitoring Program, formerly VDMP)
Launched April 2025, VAMP replaced the older VDMP/VFMP programs. Monitors both fraud and non-fraud disputes at the acquirer level (though pushed down to merchants).
- Early warning: 0.5% dispute ratio or 0.3% fraud ratio
- Standard: 0.9% combined dispute + fraud ratio = enrollment
- Excessive: 1.5% = escalation, monthly fines per chargeback
- Fines at Excessive: $5-$25+ per chargeback, plus $10,000+ monthly enrollment fees
Mastercard ECM (Excessive Chargeback Merchant program)
- Enrollment: ≥ 1.5% chargeback-to-transaction ratio AND ≥ 100 chargebacks in a single calendar month
- Excessive: ≥ 3.0%
- High Excessive: ≥ 5.0%
- Fines: $25 per chargeback at ECM tier, $50 at Excessive, $100 at High Excessive, plus $1,000-$25,000 monthly enrollment fees depending on tier and duration
Amex RED (Regulatory Excessive Disputes)
- Threshold: ≥ 1.0% dispute-to-transaction ratio in any calendar month with 100+ disputes
- Fine: $25 per dispute once enrolled, non-refundable even on win
How the ratio is calculated
The math is: chargebacks in month M ÷ transactions in month M-1 (yes, lagged — chargebacks land one month late for accounting purposes). This means a surge in disputes in month M gets benchmarked against last month's (possibly smaller) transaction volume, which can push the ratio higher than it feels.
What happens when you cross
- Acquirer notifies (or learns about it via the network).
- Reserve imposed or increased. The bank holds a larger slice of your settlements to cover anticipated losses. See our reserve entry.
- Remediation plan required. Acquirer may ask for refund policy changes, descriptor cleanup, fraud-screening upgrades, chargeback alert service enrollment (Verifi / Ethoca).
- Fines accrue monthly while enrolled.
- If no improvement in 60-180 days: acquirer termination. Account closed. Likely MATCH list placement, which freezes you out of the ecosystem for 5 years.
How to stay under
- Descriptor hygiene. A billing descriptor your customer recognizes prevents "I don't remember this charge" disputes — the most common category.
- Responsive support. Refund within 24 hours of request and the customer usually doesn't open a dispute.
- Chargeback alerts. Verifi CDRN and Ethoca give you 24-72 hours to refund before the dispute hits your ratio. For ~$20-$40 per resolved alert, you keep your ratio clean.
- Fraud screening. 3DS 2.0 shifts chargeback liability to the issuer on authenticated transactions. Worth the friction at high-risk thresholds.
- Representment with compelling evidence. Winning disputes removes them from the numerator.