Affiliate fraud is more common than most program managers want to admit. Industry estimates put fraudulent commissions at somewhere between 10 and 15 percent of total affiliate spend globally — and in poorly monitored programs, the figure is often higher.
The uncomfortable truth is that some of this fraud comes from affiliates who know exactly what they’re doing, and some comes from low-quality affiliates who don’t fully understand what constitutes a violation. Effective fraud prevention addresses both.
The Most Common Types of Affiliate Fraud
Trademark bidding is the most widespread. An affiliate bids on your brand name in paid search, intercepts traffic that was already coming to you organically, and claims commission on sales you would have made anyway. It’s easy to detect with periodic brand name search monitoring and almost always violates program terms.
Cookie stuffing involves placing affiliate tracking cookies on users’ browsers without them having actually clicked an affiliate link. When those users later make a purchase, the affiliate claims commission. This is outright fraud and typically requires more technical sophistication — but it happens.
Coupon code misuse covers a range of behaviors: affiliates publishing coupon codes they weren’t authorised to share, aggregator sites picking up codes and distributing them widely, and “deal” sites intercepting last-click attribution by inserting themselves at the end of a customer journey that started elsewhere.
Incentivised traffic means affiliates paying or rewarding users to click affiliate links or complete purchases, producing conversions that don’t represent genuine commercial intent and typically have high return and churn rates.
Transaction fraud is less common but most damaging — affiliates using stolen credit cards or generating fake transactions to claim commissions, then reversing the charges. Monitoring for unusual transaction patterns and high reversal rates catches most of this.
How to Detect Fraud in Your Program
Most fraud leaves visible traces in your data if you know what to look for. A few things to monitor regularly:
Abnormally high conversion rates from specific partners. If a partner is converting at 15 percent when your site average is 3 percent, something is wrong. Either they’re sending highly qualified, highly targeted traffic — or they’re inflating conversions through fraud. Investigate before assuming the positive explanation.
High reversal rates from specific partners. If one affiliate’s referred customers return products or cancel subscriptions at a significantly higher rate than average, their traffic quality is poor or their traffic is fraudulent. Both warrant termination.
Traffic that looks like direct. Affiliate-referred traffic should come from a referral source. If you see affiliate commissions being claimed but the sessions show no referrer, cookie stuffing is a likely explanation.
Brand name search intercepts. Run regular searches for your brand name across major search engines and check whether affiliate ads appear. If they do, and your terms prohibit trademark bidding, terminate immediately and claw back the commissions.
Unusual geographic patterns. If an affiliate is sending significant traffic from countries where your product has no market presence, the traffic quality is likely negligible.
Prevention: Building a Program That’s Harder to Defraud
Clear terms and conditions, communicated upfront, prevent a significant portion of violations that happen simply because affiliates didn’t know certain activities were prohibited. Your program terms should explicitly cover: trademark bidding restrictions, prohibited traffic sources, coupon code authorisation requirements, and consequences for violations.
Vetting affiliates properly before approval is the most effective preventative measure. Reviewing each application for legitimate content, genuine audience, and relevance to your product filters out the majority of bad actors before they’re ever in the program.
Monitoring regularly — not just in response to anomalies — creates a deterrent effect. Affiliates who know a program is actively monitored are significantly less likely to attempt violations.
Handling Violations
When you find a violation, the response should be proportionate and consistent. For first-time, less serious violations from otherwise legitimate partners — a warning, commission clawback for the affected period, and a requirement to remedy. For serious violations or repeat offenders — immediate termination and full commission reversal.
Document every violation and every response. If a terminated affiliate disputes the decision, having clear records of what was found and what terms were violated protects you.
The partners you want in your program will respect proper compliance management. The ones who complain about it are usually the ones who were exploiting the lack of it.
Compliance monitoring is part of every program we manage at ChampionClaw. If you’d like to understand how we approach it, the free strategy session is a good place to start.