Attribution
The True Cost of Brand Cannibalisation
Brand campaigns can report strong ROAS while the business gains less than the report suggests. The question is what those ads added, not simply what Google credited.
Updated 26 September 2026 · 5 min read
Brand intent is not one thing
A search for your homepage differs from a search comparing your products with a competitor. Paid Search can defend a listing, communicate a new offer or reach a buyer who would otherwise choose another shop. Equally, some attributed orders might have come through unpaid listings. Neither possibility is a fixed percentage of spend.
Read the account before changing it
Separate navigational, product and competitor-related queries where reporting allows it. Compare brand Search with organic visibility, total orders and contribution after ad spend. Check auction insights for competitor presence, but do not turn their presence or absence into a universal budget rule.
For PMax, inspect available search terms and channel reporting separately from Search. Brand exclusions affect specified search inventory; they do not remove all existing customers or prove the remaining orders were new. Our PMax brand diagnostic maps each signal to a next check.
Put the decision to a test
Agree what would change your budget before testing: a total-business outcome such as contribution after advertising, with practical guardrails. If a controlled geographic comparison is feasible, balance test and control areas, allow for conversion lag and record stock, promotions, prices and other media. A sequential pause can raise a question, but cannot isolate a causal effect on its own.
That is the commercial cost to investigate: not a claimed universal brand tax, but money whose contribution is still unproven. See our Performance Max service for how account decisions are reviewed.
Common questions
What is brand cannibalisation in Google Ads?
It is the risk of paying for brand demand that would have reached the business without the ad. Brand-query exposure alone does not tell you how much, if any, spend was avoidable.
How do I measure incremental lift from brand campaigns?
Where feasible, compare balanced test and control groups against a pre-agreed total-business outcome, allowing for stock, promotions, competitor activity and conversion lag. A simple before-and-after comparison is not causal proof.
Should I ever run brand campaigns?
Yes, when the commercial case warrants it, for example to defend against competitors or control a product-launch message. Test the effect where feasible rather than assuming every attributed brand order is additional or every brand click is wasted.
Google Ads documentation
Next step
What would we question in your account?
A 30-minute commercial review. We read the account against profit, stock and customer quality, and tell you what we would look at first.