BrandTaxvs.NewRevenue:MeasuringTrueIncrementality

Your Google Ads report shows a 5.0 ROAS. Impressive numbers. But here is the uncomfortable question: how much of that revenue would have happened anyway?

Brand search is the most common culprit. Someone types your brand name into Google. They were already going to buy. You paid to intercept a journey that was already heading to your checkout.

We call this the Brand Tax: the cost of paying for customers you already had. And it inflates your ROAS in ways that make scaling decisions dangerous.

The Brand Search Inflation Problem

The problem is not that brand search is worthless. Defending your brand terms from competitors has value. The problem is treating brand search revenue as new revenue when calculating your overall account performance.

Why This Matters for Scaling Decisions

When brand search inflates your blended ROAS, it masks the true performance of your prospecting campaigns. You think the account is profitable at 4.0 ROAS. But strip out brand, and your non-brand campaigns are running at 1.8.

Now someone asks you to scale. You increase budgets. The new spend goes to non-brand (where the incremental reach is). Blended ROAS crashes. Everyone panics.

This is not a scaling problem. It is an attribution problem that only becomes visible when you try to grow.

How to Measure True Incrementality

You do not need expensive incrementality tools to get a directional answer. Start with these approaches:

1. The Holdout Test

Pause brand search for 2 to 4 weeks. Measure what happens to overall revenue. If 90% of the brand search revenue still arrives through organic, direct, or other channels, you now know the true incrementality of that spend.

This is uncomfortable because it feels risky. But the cost of not knowing is paying for the same customers forever.

2. The New vs. Returning Split

Analyse your brand search conversions. What percentage are new customers versus returning customers? Returning customers are, by definition, not incremental. They were already in your ecosystem.

If 70% of your brand search conversions are returning customers, 70% of that revenue is not incremental. Adjust your expectations accordingly.

3. The Channel Overlap Analysis

Look at customers who converted through brand search. What other touchpoints did they have? If they received an email, clicked an organic result, or came through direct traffic before the brand search click, the credit is shared at best.

4. Geographic Testing

Run brand search in some regions, not others. Compare total revenue (not just paid) between the test and control groups. The difference tells you incremental value.

The Right Way to Think About Brand Spend

Brand search is not worthless. But it serves a different purpose than prospecting. Its value is:

• • Competitor defence: Preventing competitors from bidding on your terms
• • Journey completion: Ensuring customers find you after other touchpoints
• • Message control: Owning what appears when someone searches your name

These are real benefits. But they are not customer acquisition benefits. Reporting them in the same bucket as new customer acquisition distorts decision-making.

Separating Reporting for Clarity

We recommend clients report brand and non-brand performance separately. Always. The blended number is useful for finance dashboards. It is dangerous for media planning.

What True Incrementality Changes

When you know your true incrementality, several things shift:

• Budget allocation: You stop overinvesting in brand and underinvesting in prospecting.
• Target setting: You set different targets for acquisition versus defence campaigns.
• Scaling expectations: You understand that incremental spend will perform differently than your historical blended average.
• CFO conversations: You can explain why ROAS drops as spend increases, and why that is actually the right outcome.