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A Sydney plumbing company and a Melbourne family law firm ask Google Ads the same question in different words: put the next dollar of lead-gen budget into a Search campaign built on keywords, or into a Performance Max campaign that lets Google’s AI run across Search, Display, YouTube, Gmail and Maps from one place? Performance Max has been eligible for a Leads goal for some time now, alongside Sales, Website traffic and Local store visits and promotions, so this isn’t a hypothetical choice any more. It’s a setting in the new-campaign wizard.1 Here’s a framework for choosing deliberately, plus two platform changes that most “PMax vs Search” advice hasn’t caught up with yet.
What Each Campaign Type Actually Does for a Lead-Gen Account
A Search campaign is built from keywords and ad groups you control directly: you choose match types, write the ads, set bids or a bid strategy, and can see the search terms report to find out exactly which queries triggered a click. It only shows text ads on the Search Network.
Performance Max is goal-based rather than keyword-based. You supply creative assets (headlines, images, logo, optional video), audience signals, and a conversion goal, and Google Ads serves across Search, Display, YouTube, Gmail, Discover and Maps from a single campaign, optimising in real time toward that goal.1 Google’s own guidance is that it’s the recommended option when you have a specific conversion goal (including generating leads), want to extend reach beyond keyword-based Search, and are comfortable not restricting where ads appear.1
Two Things About Performance Max That Have Changed
A lot of the “don’t use PMax for lead gen” advice still circulating online is based on an older version of the product. Two changes are worth knowing before you decide:
Negative keywords now exist in Performance Max. You can add negative keywords at the campaign level or the account level, and account-level negative keywords automatically apply to all Search and Shopping inventory, including inside Performance Max campaigns. Google is explicit, though, that Performance Max negative keywords only affect Search and Shopping inventory, not Display, YouTube or Discover.2 If your objection to PMax was “I can’t stop it showing for the wrong searches,” that’s no longer entirely true.
There’s a documented priority system between Search keywords and Performance Max. When a query is identical to an exact match keyword in your Search campaign, the Search campaign is prioritised over Performance Max. When a query is identical to a phrase or broad match keyword, it shares priority with an identical Performance Max search theme, with relevance and Ad Rank breaking further ties.3 In other words, running both campaign types side by side doesn’t mean PMax “steals” your best exact-match traffic. There is one caveat: Google’s own documentation notes that if your Search campaign is limited by budget, Performance Max may occasionally serve on your exact match terms anyway.3 An under-funded Search campaign is the one scenario where this protection breaks down.
Search vs Performance Max for Lead Generation
| Search Campaign | Performance Max (Leads goal) | |
|---|---|---|
| Where ads can show | Search Network only | Search, Display, YouTube, Gmail, Discover and Maps from one campaign1 |
| Targeting control | You choose keywords and match types directly | You provide audience signals; Google’s AI finds additional converting searches and audiences |
| Negative keyword control | Full control at ad group, campaign and account level | Account- and campaign-level negative keywords, applied to Search and Shopping inventory only2 |
| Query-level reporting | Full search terms report | Limited; a search terms report is available for the Search inventory PMax uses, but not full visibility across every channel |
| Learning phase | Standard Smart Bidding learning phase of roughly 7 to 14 days9 | Conversion-based Smart Bidding only, with a 2 to 3 week learning phase after significant changes. Avoid frequent budget or bid edits during this window.5 |
| Best fit | Proving which specific services or locations convert, narrow or low-volume markets, accounts where query-level control matters | Extending reach once Search is already capturing its best keywords, accounts with decent conversion volume and real creative assets to feed the system |
A Decision Framework: Is the Account Ready to Test Performance Max for Leads?
Treat this as a readiness check, not a rule. If most of the first list applies, a test is worth running. If several items in the second list apply, keep the budget in Search for now.
Signs it’s worth testing:
- Conversion tracking for calls and form submissions is already verified and accurate. Performance Max’s bidding is entirely conversion-based, so it learns from whatever signal you give it, good or bad.5
- The Search campaign already covers your highest-intent terms as exact match keywords and isn’t budget-limited, so the priority rules above actually hold.3
- There’s enough monthly lead volume that a 2 to 3 week learning phase, plus a few more weeks of stable delivery, will produce a readable result rather than noise.5
- There are real creative assets to supply: several headlines and descriptions, a logo, photos or video of the actual business, not just the Search ad copy repurposed.
- There’s a Customer Match list or other first-party audience signal available to guide the campaign’s early targeting, which Google specifically recommends for channels that are under-serving.6
Reasons to hold off:
- The Search campaign is still budget-limited. Fix that first; running PMax alongside an under-funded Search campaign undermines the exact-match protection described above.3
- Conversion tracking is mid-migration or you can’t confirm it’s attributing leads correctly. Automated bidding optimises toward whatever it’s told is a conversion, accurate or not.
- Monthly lead volume is low enough that a multi-week learning phase would eat most of the quarter before producing a usable comparison.
- You need to prove ROI for one narrow service line or location specifically. Performance Max’s reporting is built around overall campaign performance and channel-level patterns, not clean segment-by-segment attribution.6
Worked Example: Testing Performance Max Alongside an Existing Search Campaign
Say a local plumbing business is spending $70/day on a Search campaign covering “emergency plumber [suburb]”, “hot water repairs” and “blocked drains” as exact and phrase match keywords, using Target CPA bidding, and call and form conversions are verified and reporting correctly. Before changing anything, confirm the Search campaign isn’t losing impression share to budget constraints. If it is, raise that budget first rather than diverting spend to a new campaign.
With that confirmed, the cleaner test is to run a new campaign in parallel rather than replace the existing one: keep the Search campaign at its current budget, and launch a separate Performance Max campaign with the Leads goal at a modest starting budget (for example $25 to $30/day), built from the business’s logo, several photos of vans and completed jobs, a handful of headline and description variations, and a Customer Match list of past enquiries as an audience signal. Because the existing exact match keywords on Search keep their priority as long as that campaign isn’t budget-limited, the new PMax campaign is genuinely incremental reach rather than cannibalisation.3 Let it run through its 2 to 3 week learning phase without touching budget or bids, then continue for a few more weeks before comparing cost per lead and lead quality against the Search campaign.5 If it holds up, it becomes a permanent second channel. If it doesn’t, the budget goes back to Search.
Setting Up Call Tracking Before You Compare Lead Quality
Whichever campaign type is being tested, call volume is usually the more reliable early signal for a local service business, and it needs to be tracked the same way across both. Call assets are added from Assets within the Campaigns menu: select the plus icon, choose Call from the list, pick whether the asset applies at the account, campaign or ad group level, and either create a new call asset or reuse an existing one.7 If assets exist at more than one level, the most specific one is used: an ad group-level call asset overrides campaign- and account-level ones.7 Turning on call reporting (which uses a Google forwarding number) lets calls be counted as conversions with real duration and outcome data, rather than just a click on a “Call us” button.7
Choosing a Bidding Strategy for Lead Generation
Both campaign types lean on Smart Bidding, and the naming has recently changed: starting in June 2026, Google Ads renamed “Maximize conversions with a Target CPA” to simply “Target CPA,” and “Maximize conversion value with a Target ROAS” to “Target ROAS.” The underlying bidding behaviour is unchanged, only the label is different, so don’t be thrown if an account looks like it’s running a different strategy than before.4 For a lead-gen account still building conversion history, Maximize conversions (which spends the full budget to get as many conversions as possible, with no CPA target) is the usual starting point; once there’s a specific cost-per-lead goal and enough conversion volume, Target CPA lets you set that target directly.8 Google also flagged that, starting August 17, 2026, it updated its bidding systems for campaigns limited by budget that use Target CPA or Target ROAS, which can cause temporary performance fluctuations. That is worth knowing if a budget-constrained lead-gen campaign looks unusually volatile right now.4
Common Mistakes
Mistake: switching an entire Search campaign to Performance Max in one step. Fix: run PMax as an additional, parallel campaign first, at a modest budget, so there’s a direct comparison rather than a leap of faith.
Mistake: assuming Performance Max will cannibalise exact-match Search traffic. Fix: understand the actual priority rules: exact match keywords win when identical to the query, as long as the Search campaign isn’t budget-limited.3 If cannibalisation is a real concern, check Search budget headroom before blaming PMax.
Mistake: judging a new Performance Max campaign in its first week. Fix: leave it through its full 2 to 3 week learning phase without budget or bid changes before drawing conclusions.5
Mistake: feeding Performance Max thin or recycled creative. Fix: supply genuine photos, multiple headline variations and a real audience signal such as a Customer Match list. The system optimises across the assets it’s given, and there’s not much for it to work with otherwise.
If you’d rather have someone build and read this test properly on your account, including the tracking check, the parallel structure and a real comparison, see our Google Ads management page for how we approach it.
Sources: 1. About Performance Max campaigns (Google Ads Help). 2. Negative keywords in Performance Max campaigns (Google Ads Help). 3. About keyword matching options (Google Ads Help). 4. About Target CPA bidding (Google Ads Help). 5. Troubleshoot the Performance Max channel performance report (Google Ads Help). 6. Troubleshoot the Performance Max channel performance report (Google Ads Help). 7. About call assets (Google Ads Help). 8. About Maximize conversions bidding (Google Ads Help). 9. About primary and secondary conversion actions (Google Ads Help).
