The Hidden Tax in Google Ads: Paying for Demand You Already Own

For many advertisers, the best-looking part of a Google Ads account is also the most misleading: branded search.

Why? Because brand campaigns often produce beautiful ROAS while adding far less incremental value than the dashboard suggests. Users were already searching for you. They already knew your name. In many cases, the ad is not creating demand so much as charging you to intercept it.

That is the hidden tax.

The uncomfortable evidence

This is not just a provocative theory. In eBay’s large-scale field experiment on paid search, the authors found that “brand-keyword ads have no measurable short-term benefits”.

Google’s own research is less extreme, but still uncomfortable. In its study on the incrementality of search ads, Google reported that when an advertiser already ranks first organically, only 50% of ad clicks are incremental on average. In plain English: if you already own the top organic result, a meaningful share of paid brand clicks may simply be cannibalizing traffic you could have won anyway.

That is the elephant in the room. Brand ROAS can look exceptional precisely because it sits closest to the conversion, not because it is driving the most new business.

Why AI and automation make this worse

This problem existed long before AI. But AI and automation are accelerating it.

Google says “broad match is the default match type” and promotes it as a way to reach more searches with less manual effort. That sounds helpful for non-experts. It also makes it easier for campaigns to drift toward whatever converts most easily.

And brand traffic is often the easiest traffic in the account.

Google has effectively acknowledged the risk in its own documentation. Its help page on brand exclusions says these controls help advertisers “avoid paying for clicks from users who are already navigating to your site”. That is a remarkable admission. If Google is giving advertisers official tools to stop automated campaigns from absorbing their own navigational demand, then the inefficiency is not hypothetical.

The direction of travel is also clear: Google notes that brand exclusion controls for Search campaigns have been folded into AI Max and newer campaign workflows. In other words, the same automation layer that promises simplicity also increases the need for tighter controls.

The metric that flatters the problem

This is why branded search so often escapes scrutiny.

It tends to produce high click-through rates, strong conversion rates, and eye-catching ROAS. It makes the account look healthy. But it can also become a machine for over-attribution. The platform claims the conversion. The advertiser sees reassuring numbers. The hard question goes unasked: would this customer have arrived anyway?

Even broader search incrementality findings need to be read carefully. Google has reported that search ads are highly incremental on average overall, but the picture changes materially when the advertiser already ranks strongly in organic search. For established brands, that nuance matters a lot.

How much budget goes into this?

There is no universal rule for what percentage of search spend should go to brand. But one recent B2B benchmark from Dreamdata found the average Google Search budget split was 18% branded and 82% non-branded.

That does not mean 18% is right. It means branded search is a meaningful budget line item, not a rounding error.

The real question is not “Does branded search convert?” Of course it does. The real question is whether it is generating incremental value, or simply making demand capture look like growth.

The takeaway

This is not an argument for switching off brand campaigns blindly. There are valid reasons to bid on your own name: competitor defense, message control, reseller clutter, messy SERPs, or promotional landing pages.

But in the age of AI-led campaign setup, broad defaults, and automated expansion, advertisers need more skepticism, not less. Google’s tools are getting better at finding conversions. That does not automatically mean they are getting better at finding incremental conversions.

The hidden tax in Google Ads is not always irrelevant traffic. Sometimes it is much subtler than that.

Sometimes it is paying for demand you already own — and letting automation burn that money faster.

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