Performance Max and Search campaigns in Google Ads offer a feature specifically designed to optimize new buyer acquisition: New Customer Acquisition (NCA) bidding.
This option allows you to direct your smart bidding strategy to recognize the difference in value between someone who has already bought from you and someone who has never interacted with your brand.
Google Ads uses your remarketing lists, Enhanced Conversions data, and its own machine learning algorithm to identify who is a returning user and who is a new user.
- New Customer Value (Recommended mode): Keeps bidding for all users, but assigns an additional value (a conversion "bonus") to new users. This tells the algorithm that you are willing to pay a higher Cost Per Acquisition (CPA) or accept a lower ROAS in the short term just to acquire that customer.
- New Customers Only: The campaign only shows ads to people who have never bought from your business. This is a much more aggressive approach, ideal for brands with budgets dedicated exclusively to prospecting.
1. First-Party Data: It is essential to have your customer lists (Customer Match) and conversion remarketing tags set up and updated.
2. Conversion tagging: Activate enhanced conversions so that the margin of error when identifying existing customers is as low as possible.
3. Data volume: Works best on accounts with a steady flow of monthly conversions (minimum 30-50 conversions per month per campaign).
Your repeat purchase rate is high: If your customers buy again organically or through email marketing, you don't need to spend as much ad budget re-engaging them on Google.
Scale strategy: If your current campaigns are stagnant by always capturing the same audience and you need to expand your market.
Wide LTV margin: If you know that the first order leaves a low margin, but the second and third orders generate the real profitability of your business.
For the Google Ads algorithm to precisely optimize New Customer Acquisition (NCA) bidding, the system needs to reach 3 key minimums in data volume and history:
Customer Match list (email/phone upload): The list must have at least 1,000 active matched users on the network where you plan to advertise (Search, YouTube, Shopping, etc.).Note: Simply uploading 1,000 emails to the platform is not enough; Google must be able to link at least 1,000 of those emails to real Google accounts.
Pixel / Remarketing tag: The buyer list generated by the pixel on your website should ideally include users from the last 180 to 540 days.
Learning window: You need a margin of 2 to 3 weeks without making drastic changes once the feature is activated. During the first few days, the cost per acquisition (CPA) or ROAS may fluctuate while the algorithm recalibrates to value both types of users differently.
If you activate the option without enough data volume, one of these two problems will occur:
"New Customers Only" Mode: The campaign may run out of impressions due to lack of reach or overbidding.
"New Customer Value" Mode: Google won't know accurately how to distinguish who is new and will end up applying the value "bonus" to customers who actually already knew you.
Don't limit yourself to uploading your customer list once a year. Connect your CRM (HubSpot, Salesforce, Shopify) directly with Google Ads via Zapier or the native API.
Why it works: If a user buys today and you don't update the list instantly, Google Ads will continue considering them a "new customer" for days and will spend extra budget trying to acquire them again.
2. Use the new_customer conversion parameter in the web tag
Don't rely 100% on cookies or Google algorithms to guess who is new.
Why it works: You can ask your developer to pass the value new_customer: true in the Google Ads conversion tag when the user makes the purchase while authenticated or by detecting if it is their first order in your database. This eliminates the margin of error from automatic detection.
3. Adjust the "Bonus" value based on real profitability, not Revenue
Many advertisers make the mistake of setting an invented new customer value. To calculate the correct value, use this simple formula:
Why it works: You give Smart Bidding a mathematically real figure. If a customer yields you €150 in the first year and their first purchase is €50, your bidding bonus should be €100.
4. Force pure prospecting using "Hidden" audience exclusions
If you activate the "New Customers Only" option, Google sometimes takes weeks to fully understand who to exclude.
Why it works: Help the system from day 1 by manually adding your buyer remarketing lists (last 540 days) and your Customer Match lists as audience exclusions in the campaign segment tab. This ensures 0% cannibalization from minute one.
5. Create a "Twin" campaign (Clean A/B Test)
To know if bidding for new customers really brings you more incrementality or just makes your costs more expensive:
Duplicate your current campaign with a Google Ads Experiment (50/50 traffic split).
In version B, activate New Customer Value.
Measure for 30 days not only the CPA/ROAS in Google Ads, but also the new user sales in Google Analytics (GA4).
6. Combine it with "Broad Match" in Search
If you use New Customer Bidding in traditional Search campaigns with exact match keywords, you will severely limit reach.
Why it works: By combining Broad Match + Smart Bidding + New Customer Bidding, you give the algorithm freedom to seek out broader or non-obvious searches from users who have never heard of your brand, while keeping control of the cost.
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