The Performance Max Brand Leak Audit: Measuring the Spend You Would Have Won Anyway

By Joshua Uebergang - Friday August 21, 2026 Share (Twitter) WhatsApp Summarize ChatGPT Perplexity Grok Google AI Performance Max reports the best return in most ecommerce accounts I audit. That is usually a reporting artifact rather than a result.

Somewhere inside the campaign, Google is buying clicks on the store’s own name, and most of those orders were arriving regardless. Proving it used to take a geo holdout and a patient client. It no longer does.

Google now publishes individual search terms for Performance Max, supports negative keywords at both campaign and account level, and lets you exclude brands from specific inventory. The audit below uses all three and takes an afternoon. What a brand leak is, and why the system creates one None of this is Google acting in bad faith.

Performance Max is a bidding system pointed at a target you set, and it takes the cheapest available path to that target. In a typical store, brand queries convert several times better than everything else and cost less per click. Give the system a return target and no instruction about brand, and your own name is the most efficient inventory it can find.

The cost shows up in the number you report. Campaign return becomes a blend of demand you created and demand you already had, and a blend is not something you can set a target against. Every decision downstream, budget increases included, gets made on a figure that is partly a measurement of your own brand equity.

Above: Image made by the author with AI Step 1: Pull the search terms Go to Search terms in the Campaigns menu, then switch the dropdown to the Performance Max search terms report. You get individual terms with their landing pages and ad formats, and history reaching back to March 2023.

Segment by ad format so Shopping ads and text ads sit in separate rows, because the remedy for each one is different. Export it and classify every term. Use a regex on your brand token and its misspellings rather than working down the list by eye, because a four thousand row export will beat your patience long before it beats your judgment.

Five buckets are enough: 1. Pure brand. The brand name on its own, plus misspellings, plural forms and spacing variants. 2. Brand plus product. “brandname trail shoes” and the like. This is still brand demand, and the shopper has already chosen you. 3. Brand plus qualifier. Reviews, discount code, sizing, returns, login. Often existing customers. 4.

Brand plus competitor. Genuinely contested, so keep it separate from the rest. 5. Nonbrand. Everything else. One caveat belongs in your notes before you present any of this. The report covers Search and Shopping inventory, so it says nothing about Display, YouTube or Discover impressions.

What you are calculating is a brand share of search-originated traffic, which is where the leak lives, not a brand share of the whole campaign. Step 2: Size the leak in dollars and in orders Most audits produce one number where they need two. Brand share of cost tells you what you are spending.

Brand share of conversion value tells you what the campaign’s reported success is actually made of. Then rebuild the campaign without brand. Strip brand cost and brand conversion value out, and calculate the return on what is left.

That figure is what your nonbrand advertising is genuinely delivering, and it is the only version of the number that a target should ever be set against. The gap between the two is usually where the conversation changes.

A campaign reporting a comfortable blended return can be running well under break-even on nonbrand once the store’s own name comes out, and nobody in the account had a report that would have shown it. Corroborate it outside the platform while you are in there.

Pull clicks for the same brand queries out of Search Console and compare the trend against paid brand clicks. Total brand search volume sitting flat while paid brand clicks climb is about as clear as this evidence gets.

Step 3: Decide whether the leak is worth plugging Not all brand spend is waste, and an audit that recommends cutting it unconditionally is a bad audit. Four situations make paying for your own name defensible: Competitors or affiliates bid on your brand, so you lose the top slot the moment you stop.

Resellers and marketplace listings outrank your own product pages, which means the click you decline lands on a page you do not control. The brand name doubles as a category word, so the traffic is genuinely mixed and cannot be cleanly separated.

You hold the top organic result but the Shopping unit sits above it, so the visible top of the page is paid whatever you do. The point of the audit is not to stop paying for branded searches. It is to pay for it deliberately, at a price you chose, in a line item you can read, instead of accidentally at whatever Performance Max decides your name is worth