Should You Fight or Accept This Chargeback?
Quick answer
Fight if: dispute value > contest cost ÷ win probability. With a $5 self-serve response and 80% win probability: fight any dispute above $6.25. At 50% win probability: fight disputes above $10. On a 20% success fee there is no upfront cost. Always fight if you have strong evidence - even on small disputes, to build CE 3.0 history and deter repeat disputers.
The fight-or-accept decision is a break-even calculation. With a $5 self-serve response - or a success fee with no upfront cost at all - the break-even is very low, making it worth contesting almost every dispute above $10. The more nuanced question is which disputes have high enough win probability to be worth contesting.
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The Break-Even Formula
Fight if:
(Dispute Value × Win Probability) > Contest Cost
With a $5 self-serve response: break-even = $5 ÷ Win Probability
| Estimated win probability | Break-even dispute value (at $5 per response) | Verdict |
|---|---|---|
| 90% | $5.56 | Fight almost every dispute above $6 |
| 80% | $6.25 | Fight disputes above $7 |
| 70% | $7.14 | Fight disputes above $8 |
| 50% | $10.00 | Fight disputes above $10 |
| 30% | $16.67 | Fight only if high-value or strategic |
| <20% | $25+ | Consider accepting; few disputes are worth it |
Win Probability by Dispute Type
| Dispute type | Typical win rate | Key evidence needed | Fight? |
|---|---|---|---|
| Friendly fraud w/ CE 3.0 evidence | 80–90% | IP match + prior purchases | Always fight |
| Physical goods - confirmed delivery | 75–85% | Carrier confirmation + signature | Always fight |
| SaaS - active account usage | 70–80% | Login records + usage logs | Fight above $12 |
| Physical goods - no signature | 50–65% | Tracking only (no signature) | Fight above $20 |
| Subscription - no cancellation email sent | 40–55% | ToS + usage but no advance notice | Fight above $25 |
| Genuine CNP fraud, no CE 3.0 | 20–35% | Weak without prior purchase history | Consider accepting |
| Clearly not delivered (your error) | 5–15% | None - error acknowledged | Accept + refund |
Non-Financial Reasons to Always Fight
Even when the math suggests accepting, there are strategic reasons to fight all disputes above a minimum threshold:
- CE 3.0 evidence building: Each won dispute creates prior undisputed transaction history usable in future fraud disputes. Not contesting today makes future CE 3.0 defenses weaker.
- Deterring serial disputers: Merchants who fight all disputes are less attractive targets for repeat friendly fraud. Word travels in friendly-fraud communities.
- Acquirer credibility: Acquirers look favorably on merchants who actively manage disputes - not just accept every chargeback.
Frequently Asked Questions
Should I fight or accept a chargeback?+
What is the break-even for contesting?+
Is it worth fighting a small chargeback?+
When should you never fight?+
Does winning affect my chargeback ratio?+
At $5 per response or less, fighting is worth it on almost any dispute above $10. Let ChargeMate handle the response.
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