You pay affiliates a commission for sending you new customers. That is the deal. But some affiliates have found a shortcut: instead of creating content or building audiences, they bid on your brand name in Google Ads, intercept customers who were already heading to your site, and collect commission on sales that would have happened without them.

This is affiliate brand bidding, and it is one of the most expensive hidden costs in affiliate marketing. You are paying commission — typically 5-15% of revenue — on sales where the affiliate added zero value.

If you run an affiliate programme and have not actively checked for brand bidding, the odds are it is happening. This article explains how to detect it, prevent it, and recover control.

What Affiliate Brand Bidding Looks Like

An affiliate runs Google Ads targeting your brand name and close variations. When someone searches for "YourBrand discount code" or "YourBrand free delivery," they see the affiliate's ad. The ad typically mimics your own messaging — same offers, similar copy, often using a display URL that looks like your domain.

The user clicks the affiliate's ad, which redirects through the affiliate tracking link to your website. The affiliate cookie is set. The customer makes a purchase they were going to make anyway. The affiliate earns commission.

From your perspective, this appears as a legitimate affiliate sale in your tracking platform. The attribution looks clean. But the affiliate did not generate this customer. They simply placed themselves between an existing customer and your checkout page.

Why Affiliates Do It

The economics are straightforward. Brand keywords have:

Low cost per click: Brand CPCs are typically £0.20-£1.00 because there is limited competition (or there was, before the affiliate started bidding). If your branded CPC has suddenly increased, affiliate brand bidding is one of the most common causes.
High conversion rates: People searching your brand name convert at 10-30%, far higher than generic searches.
Easy ROI: If an affiliate pays £0.50 per click, gets a 15% conversion rate, and earns 8% commission on a £100 average order, the maths works out: £0.50 cost per click, £1.20 revenue per click. That is a 140% return.

The affiliate is not building anything. No content, no audience, no genuine marketing effort. They are simply arbitraging the gap between low brand CPCs and your commission rate.

For the affiliate, this is free money. For you, it is a direct cost on revenue you would have earned anyway.

The Scale of the Problem

The amount of money lost to affiliate brand bidding is often substantial. Consider a mid-market ecommerce business doing £2 million per year through its affiliate channel. If 20% of affiliate sales are actually from brand bidders (a conservative estimate for programmes that do not actively police this), that is £400,000 in revenue attributed to affiliates who added no value.

At an 8% commission rate, that is £32,000 per year in wasted commissions — on top of whatever those brand clicks are costing you in inflated CPCs for your own brand campaigns.

Some affiliate programmes lose far more. Coupon and deal sites are notorious for brand bidding, and they often represent a disproportionate share of affiliate revenue precisely because they are gaming the attribution.

How to Detect Affiliate Brand Bidding

Detection requires a combination of manual checks, tool-based monitoring, and network-level analysis.

Manual SERP Checks

The simplest detection method is to search for your own brand name and variations in Google, and look for ads that are not yours.

Search for:

Your brand name
Your brand name + "discount code"
Your brand name + "voucher"
Your brand name + "sale"
Your brand name + "free delivery"
Common misspellings of your brand name

Do this from multiple devices and locations, and use incognito/private browsing to avoid personalised results. Affiliate ads often only appear at certain times of day or in specific geolocations to avoid detection.

The limitations of manual checking are obvious. Affiliates know you might be searching, and they use techniques to hide their activity — dayparting (running ads only at night or weekends), geo-targeting (excluding your office location), and device targeting (showing ads only on mobile).

Google Ads Auction Insights

If you are running your own brand campaign, the Auction Insights report shows who else is appearing in the same auctions. Look for unfamiliar domains or display URLs. Cross-reference any unknown competitors with your affiliate list.

This will not catch all affiliate brand bidders — some use redirects that obscure their identity in Auction Insights — but it catches the careless ones.

Click-Through Analysis

Examine your affiliate network reports for suspicious patterns:

Affiliates with unusually high conversion rates on brand traffic. If an affiliate converts at 20% while your site average is 5%, they are likely capturing pre-existing demand, not generating new traffic.
Affiliates with very low time-to-conversion. If the click-to-sale window is consistently under 30 minutes, the affiliate is probably intercepting customers who were already in your purchase funnel.
Affiliates whose traffic spikes when your brand search volume is high. Genuine content affiliates have traffic patterns driven by their own audience. Brand bidders have traffic patterns that mirror your brand search volume.

Affiliate Network Tools

Most affiliate networks (Awin, CJ, Partnerize, Impact) offer brand bidding detection tools or reports. These vary in quality, but they can flag affiliates whose referral patterns match paid search behaviour.

Ask your network account manager specifically about brand bidding monitoring. Many networks will investigate and take action if you provide evidence.

Automated Monitoring

Manual checks and network tools have gaps. Affiliates actively evade detection. The most reliable approach is automated, continuous SERP monitoring that checks for unauthorised ads on your brand terms across locations, devices, and times of day.

Run a free brand bidding audit to get an immediate snapshot of who is currently advertising on your brand keywords — including any affiliates who might be bidding without your knowledge.

How to Prevent Affiliate Brand Bidding

Prevention requires clear policies, active enforcement, and ongoing monitoring.

1. Update Your Affiliate Terms and Conditions

Your affiliate agreement should explicitly address paid search and brand bidding. Many programmes have vague or outdated terms that do not clearly prohibit brand bidding, leaving a grey area that affiliates exploit. We have a ready-to-use affiliate brand bidding policy template you can drop straight into your programme terms.

Your terms should cover:

Prohibited keywords. Explicitly list your brand name, product names, common misspellings, and variations that affiliates may not bid on. Be thorough — affiliates will bid on anything not explicitly prohibited.

Prohibited ad practices. Ban the use of your brand name in ad copy, display URLs, and ad extensions. Prohibit direct linking (sending traffic straight to your site via an affiliate link without an intermediary landing page), as this is a hallmark of brand bidding.

Consequences. Specify what happens when violations are detected: commission reversal for all sales attributed to prohibited activity, immediate removal from the programme for repeat offenders, and potential clawback of historical commissions.

2. Template Affiliate Policy Clauses

Here are example clauses you can adapt for your affiliate agreement:

Paid search restriction: "Affiliates are prohibited from bidding on any keywords that include [Brand Name], any product names owned by [Brand Name], misspellings, or variations thereof, across all paid search platforms including but not limited to Google Ads, Microsoft Advertising, and any other search engine marketing platform."

Ad copy restriction: "Affiliates may not use [Brand Name], its product names, or any confusingly similar terms in ad headlines, descriptions, display URLs, or ad extensions."

Direct linking restriction: "Affiliates may not direct paid search traffic to [Brand Name] website URLs via affiliate tracking links without an intermediary landing page that is clearly owned and operated by the affiliate."

Enforcement clause: "Violations of this paid search policy will result in immediate commission reversal for all sales attributed to the prohibited activity. Repeated violations will result in removal from the affiliate programme. [Brand Name] reserves the right to claw back commissions paid on historically fraudulent traffic."

3. Implement Network-Level Controls

Work with your affiliate network to implement technical controls:

Keyword blacklists. Some networks allow you to upload lists of prohibited keywords that trigger automatic monitoring.
Sub-ID tracking. Require affiliates to pass sub-IDs with their traffic. This makes it easier to identify the traffic source and flag paid search activity.
Referrer analysis. Configure your tracking to capture and report on referrer data. Traffic arriving from Google Ads via an affiliate link has a distinct referrer pattern.

4. Regular Auditing and Enforcement

Policies without enforcement are meaningless. Schedule regular audits:

Weekly automated SERP monitoring for your brand terms across geolocations and times of day.
Monthly affiliate traffic analysis to flag suspicious patterns (high conversion rates, low time-to-conversion, traffic that mirrors brand search volume).
Quarterly affiliate programme review to identify and remove affiliates who consistently generate low-quality, brand-only traffic.

When you catch a violator, act immediately. Reverse commissions, issue a formal warning, and remove repeat offenders. Word travels quickly in affiliate circles — consistent enforcement deters others from trying.

5. Consider a Brand Bidding Allowance

Some programmes take a more pragmatic approach. Rather than banning all brand bidding, they allow it only under strict conditions: the affiliate must use approved ad copy, bid below a maximum CPC, and not compete with the brand's own campaigns.

This approach can work if you have the resources to monitor compliance closely. But for most businesses, a blanket prohibition is simpler and more effective.

Recovering from Affiliate Brand Bidding

If you discover that affiliates have been bidding on your brand terms, take these steps:

Document the evidence. Take screenshots of affiliate ads, record the dates and search terms, and pull attribution data from your affiliate network.
Reverse commissions. Calculate the commissions paid on sales attributed to brand bidding and issue reversals through your network.
Notify the affiliate. Issue a formal notice citing the specific policy violation and the consequences.
Update your monitoring. Implement ongoing automated monitoring to prevent recurrence.
Review your programme. Consider whether your commission structure inadvertently incentivises brand bidding. If your commission is high and your brand CPCs are low, the arbitrage opportunity will continue to attract bad actors.

The Bigger Picture

Affiliate brand bidding is a symptom of a broader problem: misaligned incentives in performance marketing. Affiliates are rewarded for driving attributed sales, not for adding genuine value. Until your programme is structured to distinguish between demand creation and demand interception, some affiliates will always take the easy route.

The solution is a combination of clear policies, consistent enforcement, and continuous monitoring. Use the brand bidding calculator to estimate how much affiliate brand bidding might be costing you, and take action accordingly.

Your affiliate programme should pay for new customers, not tax your existing ones.

Affiliate Brand Bidding: How to Detect and Prevent It