Performance Max can work for a small business, but for most local service businesses on a modest budget it isn't where I'd start. It spends one budget across Search, YouTube, Display, Gmail, Discover and Maps, and it relies on accurate conversion data to decide where that money goes. If your tracking is shaky, your lead volume is low or your budget is only just enough for Search, a well-built Search campaign will usually bring better leads for the same money. Once Search is covering your core services and your tracking is solid, Performance Max is worth testing alongside it.
I'm Google Ads certified in Performance Max, as well as Search and Shopping, and before I moved into digital marketing in 2019 I spent 16 years running a plumbers' merchants. So I've seen PMax from both sides: what Google's training says it can do, and what it actually does to a small trade business's lead quality. This article is part of my small business guide to Google Ads.
What Performance Max actually is
Short answer: Performance Max is a single campaign that shows your ads across all of Google's advertising space, with Google's AI deciding where, when and to whom. You give it goals, a budget, ads and signals. It decides the rest.
Google describes it as a goal-based campaign type that gives access to all of your Google Ads inventory from one campaign, reaching YouTube, Display, Search, Discover, Gmail and Maps. It's available when your objective is sales, leads or local shop visits, and it needs conversion goals to work towards. Google's channels page also confirms that its Search inventory includes search partners.
The difference from a Search campaign is control. In Search, you choose the keywords, write ads for them, and decide which searches you're willing to pay for. In Performance Max there are no keywords. You can add "search themes" to guide it, but Google says these are additive to the queries and placements Performance Max predicts. They add to what it does, rather than limit it.
What you can and can't control in Performance Max now
Short answer: far more than when it launched. As of September 2026 you can add negative keywords, apply brand exclusions and see search terms and channel-level results. What you still can't do is tell it exactly which searches to bid on or how much to pay for each one.
A lot of what's written about Performance Max being a "black box" is out of date. Google has added controls and reporting steadily. Here's where things stand, checked against Google's own help pages:
| Control or report | Available now? | What it means for you |
|---|---|---|
| Campaign-level negative keywords | Yes | Stop it showing for searches you don't want. Applies to Search and Shopping inventory only. Up to 10,000 per campaign. |
| Negative keyword lists | Yes | Apply the same shared lists you use in Search campaigns. |
| Account-level negative keywords | Yes | Up to 1,000 terms that apply across Search, Performance Max and other campaign types. |
| Brand exclusions | Yes | Stop it serving on searches for your own business name, or other brands, on Search, Shopping and YouTube search. |
| Search terms report | Yes | See the actual searches that triggered your ads, with conversions, and add negatives from it. |
| Channel performance report | Yes | See how spend and results split across Search, YouTube, Display, Discover, Maps, Gmail and search partners. |
| Placement reports | Yes | See which websites and apps your ads appeared on, and exclude poor ones. |
| Final URL expansion | Can be switched off | Stop Google sending people to pages of your site you didn't choose. |
| Auto-generated video | Upload your own to prevent | If you don't provide video, Google may generate one for you. |
| Search themes | Up to 50 per asset group | Hints about searches to target. They add to reach rather than restrict it. |
| Choosing exact searches and bids | No | Google decides which searches to enter and how much to bid. |
Sources for the table: Google's help pages on negative keywords in Performance Max, account limits (10,000 negatives per campaign), account-level negative keywords, brand exclusions, the Performance Max search terms report, the channel performance report, placement reports, Google's Performance Max best practices for lead generation (final URL expansion and auto-generated video) and its announcement of more visibility and control in Performance Max (negative keyword lists, 50 search themes, device targeting and age controls).
One point Google makes that's worth knowing: in that announcement it says Performance Max "is designed to find performing Search traffic for your brand, so negative keywords aren't always needed." For a big retailer, maybe. For a small trade business paying for every click, I disagree. I add negatives from day one, exactly as I would in Search. My guide to negative keywords and the search terms report explains the lists I use.
How Performance Max and Search work together
Short answer: if you run both, a Search campaign with an exact match keyword that matches the search wins over Performance Max. Otherwise, whichever has the higher Ad Rank serves. That means Performance Max can take searches you thought your Search campaign was covering.
Google's help page on how Performance Max interacts with other campaigns gives a trade example: if someone searches "plumbrs" and your account has the exact match keyword [plumbers], the Search campaign is preferred over Performance Max. If no keyword exactly matches the search, the campaign with the higher Ad Rank serves.
In practice, that means two things for a small account:
- Keep your most valuable searches in Search, as exact match. That way you keep control of the ads, landing pages and bids for the jobs that matter most.
- Use brand exclusions in Performance Max. Otherwise it can pick up people searching for your business name, who would probably have found you anyway, and count them as its own conversions. That makes Performance Max look better than it is.
Where AI Max fits in
AI Max is often confused with Performance Max, and the names don't help. AI Max is a set of AI features switched on inside a Search campaign. Performance Max is a separate campaign type. Google's AI Max help page says it's designed to optimise Search campaigns while keeping familiar Search campaign structures.
| AI Max for Search | Performance Max | |
|---|---|---|
| What it is | Features inside a Search campaign | Its own campaign type |
| Where ads show | Search | Search, YouTube, Display, Discover, Gmail, Maps |
| Keywords | Your keywords, plus matching beyond them | No keywords, search themes only |
| Can switch parts off | Yes, search term matching and text customisation | Some settings, such as final URL expansion |
| Being applied automatically | Yes, to some Search campaigns from September 2026 | No, you have to create it |
That last row matters. Google's announcement says Search campaigns using Dynamic Search Ads, automatically created assets or the campaign-level broad match setting are being upgraded to AI Max automatically from September 2026. So even if you've avoided Performance Max, some of the same kind of automation may already be running in your Search campaigns. Check your settings and Change history.
When Performance Max suits a small lead generation business
Short answer: when the basics are already in place and you want more reach than Search alone can give. Not as a shortcut to avoid setting up Search properly.
| Search is usually better if | Performance Max may be worth testing if |
|---|---|
| Your budget is only just enough for your main searches | Search is limited by search volume, not budget, and you have money left over |
| Tracking is basic, or calls aren't measured | Calls and forms are tracked accurately, ideally with qualified leads fed back to Google |
| You get a handful of leads a month | You get a steady flow of leads every month for the AI to learn from |
| You only want people actively searching for your service | Your work sells well visually, such as kitchens, landscaping or loft conversions |
| You serve a tight local area | You cover a larger area or sell to a wider audience |
| You have no decent photos or video | You have real photos and video of your work |
For most of the tradespeople and small service businesses I work with, the left-hand column describes them. Someone with a leaking pipe searches Google. They don't browse YouTube hoping to see a plumber's ad. Search captures that demand directly, and with a small budget there's rarely anything left for the other channels once it's done its job.
Performance Max makes more sense for businesses where people take longer to decide and like to see the work first, or for ecommerce, where Google's shopping inventory is a big part of the picture.
The lead quality problem
Short answer: in my experience, the most common complaint about Performance Max for lead generation is poor quality leads, usually because the AI is optimising towards whatever counts as a conversion, and the cheapest source of those is often not real customers.
If your conversion is "form submitted", Performance Max will find people who submit forms. Some of them will be customers. Some will be bots, spam, or people who tapped something on a mobile game by accident. Because Display and similar placements can produce form fills cheaply, the AI can drift towards them. The numbers in Google Ads look great. Your phone stays quiet.
Google's own lead generation best practices acknowledge this. Its suggestions include:
- Using lead-specific goals such as "Contact", "Submit lead form" or "Request quote", which Google says gives access to enhanced protections against invalid lead activity.
- Adding qualifying questions, reCAPTCHA and server-side validation to forms to cut spam.
- Optimising towards deeper funnel actions, such as qualified or converted leads, where possible.
- Reviewing placement reports and excluding poor sites and apps.
The strongest fix is telling Google which leads were real. That means importing qualified leads back into Google Ads, for example with enhanced conversions for leads. It takes some setup and a bit of discipline to mark up which enquiries became jobs, which is exactly why most small businesses don't do it. Without it, Performance Max is learning from a noisy signal. My guide to Google Ads conversion tracking covers getting the basics right first.
If you do run Performance Max: my setup checklist
- Get Search right first. Your core services in Search, exact and phrase match, with solid negatives.
- Check conversion goals. Only real leads as primary conversions. No page views or clicks.
- Add brand exclusions so it doesn't take credit for people searching your name.
- Apply your negative keyword lists at campaign level from day one.
- Set location to "Presence". Google's own lead generation guidance suggests this if you're getting leads from outside your area.
- Decide on final URL expansion. Switch it off if you want people landing only on pages you've chosen.
- Upload your own images and video. Real photos of your work, not stock. Otherwise Google may generate video for you.
- Protect your forms with reCAPTCHA or a qualifying question.
- Review weekly: channel performance, search terms, placements and, most importantly, the quality of the leads.
On timing, Google suggests allowing at least one to two weeks, or up to six weeks for low conversion volume, before making major changes. For a small business with a handful of leads a week, expect the longer end. For Search campaigns, my experience is that it typically takes three to four weeks before Google has learned how best to convert.
If Performance Max was recommended to you by a Google rep or in the Recommendations tab, it's worth reading my take on whether to accept Google Ads recommendations first. And if you're already running it and leads have dried up, my guide on why Google Ads get clicks but no calls is a good place to start.
FAQ
Is Performance Max good for small businesses?
It can be, but usually not as the first or only campaign. For a small local lead generation business, Search tends to give more control and better leads for the same budget. Performance Max is more likely to work once tracking is accurate, leads are coming in steadily and there's budget left after Search.
Can you add negative keywords to Performance Max?
Yes. Performance Max supports campaign-level negative keywords and negative keyword lists, as well as account-level negatives. They apply to Search and Shopping inventory only. For YouTube and Display, Google points you to content exclusions instead.
Can you see search terms in Performance Max?
Yes. There's a search terms report for Performance Max showing the searches that triggered your ads, along with conversions, clicks and impressions. You can add negative keywords directly from it.
Will Performance Max steal traffic from my Search campaigns?
It can. A Search campaign with an exact match keyword that matches the search takes priority. Otherwise the campaign with the higher Ad Rank serves, which can be Performance Max. Use exact match for your most important searches and brand exclusions in Performance Max.
What's the difference between Performance Max and AI Max?
AI Max is a set of features inside a Search campaign that expands matching and customises ad text. Performance Max is a separate campaign type that runs across all of Google's channels. Some Search campaigns are being upgraded to AI Max automatically from September 2026.
Not sure whether Performance Max is working for you?
If you're running Performance Max, or your own Search campaigns, and they're not paying, I'm happy to take a look. I'll check where the money is actually going, what the leads look like, and tell you honestly whether Performance Max has a place in your account or whether Search would do the job better. You deal with me directly, not an account manager.
Find out more about my Google Ads management service, see my wider PPC services, or get in touch and tell me what you're running.
