Your brand campaign probably shows a 10x ROAS. Your agency calls it a top performer. Your CFO sees a number that looks great in a slide deck. But here is the uncomfortable question nobody wants to ask: would those sales have happened anyway?

For most businesses, the answer is yes. The vast majority of clicks on brand ads come from people who were already searching for your company by name. They were going to find you regardless. Your brand campaign is simply paying for traffic that organic search would have delivered for free.

The only way to know for certain is to run an incrementality test. This article walks you through exactly how to do it.

What Incrementality Actually Means

Incrementality measures the true additional value created by an advertising campaign. It answers a simple question: what revenue would I lose if I stopped running this campaign entirely?

For non-brand campaigns, the answer is usually significant. People searching for "best project management software" might click on any of the ten results. Your ad genuinely influences which product they choose.

For brand campaigns, the picture is very different. Someone searching for "Acme Software login" is not comparison shopping. They are already your customer. Paying to appear above your own organic listing for that search is not creating value — it is buying something you already own.

The gap between reported ROAS and incremental ROAS on brand campaigns is often enormous. A campaign reporting 12x ROAS might have an incremental ROAS of 2x or even less. The difference is cannibalised organic traffic — clicks you paid for that would have come through your free organic listing. We explore this measurement problem in detail in why brand ROAS is a lie.

Why Brand ROAS Is Misleading

Google Ads attributes a conversion to your brand campaign whenever someone clicks a brand ad and then converts. The platform cannot distinguish between a customer who would have found you organically and one who genuinely needed the ad to reach your site.

This creates a structural measurement problem. Brand campaigns always look profitable because they are capturing existing demand, not creating new demand. The ROAS figure tells you "people who clicked this ad spent money," not "this ad caused people to spend money."

Consider this scenario. You spend £5,000 per month on brand ads. Those ads generate £60,000 in revenue, giving you a 12x ROAS. Brilliant, right? But if you paused the campaign, organic search would pick up 75% of that traffic. Your actual incremental revenue from the ads is closer to £15,000 — and your true ROAS drops to 3x.

That £5,000 might deliver far more value if redirected to non-brand campaigns where the incremental impact is real.

How to Run a Geo-Based Incrementality Test

The gold standard for measuring brand campaign incrementality is a geo-based test. You pause brand ads in one geographic region while keeping them running everywhere else, then compare the results.

Here is the step-by-step process.

Step 1: Choose Your Test and Control Regions

Select two regions that are as similar as possible in terms of traffic volume, conversion rate, and seasonal patterns. For UK businesses, this might mean testing Scotland versus the North West, or two similarly-sized metropolitan areas.

Review at least three months of historical data to confirm the regions behave similarly. You need comparable search volumes, conversion rates, and revenue per visitor. If one region converts at 4% and the other at 2%, your test results will be unreliable.

Step 2: Establish Your Baseline

Run both regions with brand ads active for two weeks before the test begins. Record daily metrics for each region: brand impressions, brand clicks, organic brand clicks (from Search Console), total site sessions, and conversions.

Calculate the ratio between the two regions. If your test region typically generates 80% of the control region's conversions, you will need this ratio to interpret results later.

Step 3: Pause Brand Ads in the Test Region

Create a campaign-level location exclusion for your test region, or set up separate brand campaigns by geography if you have not already. Pause brand ads only in the test region. Keep everything else identical — non-brand campaigns, landing pages, offers, and budgets should remain unchanged.

Step 4: Run the Test for 2-4 Weeks

The minimum test duration is two weeks. Three to four weeks is better, particularly if your conversion cycle is longer than a few days. Shorter tests produce noisy data that is difficult to interpret.

During the test, monitor these metrics daily in the test region:

Organic brand clicks (Google Search Console)
Total site sessions from the test region (Google Analytics)
Conversions from the test region
Revenue from the test region

Step 5: Measure the Organic Uplift

When brand ads stop, organic clicks should increase. This is the cannibalisation effect in reverse — traffic that was going to paid ads now flows to organic listings.

The key metric is the organic recovery rate: what percentage of lost paid clicks were recovered by organic? Across hundreds of tests, the typical range is 70-90%. Some brands see recovery rates above 95%.

Step 6: Calculate Incremental Value

Here is the maths. Suppose your test region data looks like this:

Before test: 10,000 brand ad clicks, 15,000 organic brand clicks, 500 conversions
During test: 0 brand ad clicks, 22,500 organic brand clicks, 460 conversions

Organic recovered 7,500 of the 10,000 lost paid clicks (75% recovery rate). Conversions dropped from 500 to 460 — a loss of 40 conversions, or 8%.

If each conversion is worth £120, the 40 lost conversions represent £4,800 in monthly revenue. If you were spending £5,000 per month on brand ads in this region, your brand campaign has an incremental ROAS of less than 1x. You are spending more on the ads than the additional revenue they generate.

Interpreting Your Results

Results generally fall into three categories.

High organic recovery (85%+ of traffic, minimal conversion loss): Your brand campaign is mostly cannibalising organic traffic. The incremental value is low, and your budget is better spent elsewhere. Consider pausing brand ads entirely or running them only when competitors are actively bidding on your terms.

Moderate organic recovery (70-85% of traffic, noticeable conversion loss): There is some incremental value, but it is likely far less than your reported ROAS suggests. You may want to reduce brand spend significantly and redirect the savings to non-brand campaigns.

Low organic recovery (below 70% of traffic, significant conversion loss): Your brand campaign is providing genuine incremental value. This is less common but does occur, particularly in competitive markets where competitors bid aggressively on your brand terms. In this case, maintaining brand coverage makes sense.

What to Do After Your Test

If your test reveals high cannibalisation (which it usually does), you have several options.

Reduce brand spend gradually. Rather than switching off brand campaigns overnight, lower bids over 2-4 weeks while monitoring organic performance. This gives you time to react if competitors increase their brand bidding.

Redirect budget to non-brand campaigns. The money you save on brand ads can fund campaigns that genuinely create new demand. Non-brand campaigns typically have lower ROAS on paper, but higher incremental ROAS in reality.

Set up ongoing monitoring. The competitive landscape changes. A competitor might start bidding on your brand terms next month. You need a system that alerts you when this happens so you can respond quickly. Use our free brand bidding audit to check whether competitors are currently targeting your brand keywords.

Run the numbers. Before making any changes, use our brand bidding calculator to model the financial impact of reducing or pausing your brand spend. It quantifies the potential savings based on your actual campaign data.

Common Objections (and Why They Are Usually Wrong)

"We need brand ads for messaging control." You can control your messaging through organic meta descriptions and sitelinks. Google increasingly respects well-structured organic listings.

"Competitors will steal our traffic." This is the one legitimate concern. But it is testable — your incrementality test will reveal exactly how much traffic you lose. And the solution is not to run brand ads permanently. It is to monitor competitor activity and respond when necessary. For a detailed look at what actually happens when you turn off brand ads, see what happens when you pause your brand campaign.

"Our agency says brand campaigns are essential." Your agency earns management fees on every pound you spend. They have a financial incentive to keep brand campaigns running. That does not mean they are wrong, but it does mean you should verify their claims with data.

The Bottom Line

Most brand campaigns waste 60-80% of their budget on clicks that would have arrived through organic search. An incrementality test takes 2-4 weeks and gives you hard data on what your brand ads are actually worth.

The businesses that run these tests almost always discover significant waste. The ones that act on those findings free up budget for campaigns that genuinely grow their revenue.

Stop guessing. Test it. The data will tell you everything you need to know.

Brand Campaign Incrementality: How to Test if Your Brand Ads Are Worth It