Your Negative Keywords Still Work in AI Max — But They're Not Enough

Google's AI Max keeps your negative keywords. It also expands your ads into search territory those negatives were never built for. Here's how to stay in control.

If you've been following this series, you know the pattern by now: every new AI feature in the ad platforms trades a little of your control for a little of their automation. Google's AI Max for Search is the latest — and to Google's credit, this one actually keeps more controls intact than most.

But "the controls still exist" and "the controls still cover you" are two different things. Let's break down where the line is.

First, the Good News

Google has confirmed that negative keywords are fully honored in AI Max campaigns — and they're applied before the AI's expansion logic kicks in. If a search contains one of your negatives, it's blocked, no matter how relevant the AI thinks it is. Even Google's own Ads Liaison has been direct about this: negative keywords and brand exclusions are the tools that stop the AI from drifting into unprofitable territory.

AI Max also improves on Performance Max here: you get negative keyword support at both the campaign level and the ad group level, so you can run different exclusion logic for different parts of your account.

You're not losing that control. So what's the problem?

What's Actually Happening

AI Max is built to go wider than your keyword list. That's the entire point. It matches your ads to semantic variants, long-tail queries, and related searches your keywords don't explicitly cover — Google's framing is that your landing pages and assets are now your targeting.

Here's the catch: your negative keyword list was built around your old keyword footprint. Every negative you've added came from search terms you've actually seen. The moment AI Max starts surfacing new query territory, your ads show up for searches your negatives were never designed to catch — because you've never seen them before.

Your fence is solid. The AI just moved the property line.

Why This Matters for Your Budget

1. New territory means new waste — fast. AI expansion doesn't ramp slowly. The first weeks after enabling AI Max are when irrelevant queries flood in, before you've had a chance to block them. Without tighter monitoring, you're paying tuition on every bad click.
2. The brand trap. This is where most advertisers get tripped up. If you've added your own brand name as a negative keyword, you might assume branded traffic is handled. It's not — at least not fully.
   
   Negative keywords block queries that contain your brand name. Brand exclusions work differently: they tell Google's AI not to target users whose intent is brand-related, even if your brand name never appears in the search. Think "alternatives to [your brand]" misspellings, or "[that spa on Main Street] reviews." Two different mechanisms, two different gaps. If you want branded traffic fully separated from your prospecting budget, you need both.
3. The AI doesn't know your business. It knows semantic similarity. It doesn't know that you don't serve commercial clients, that "cheap" leads never close for you, or that a nearby city is outside your service area. Negatives are your manual override — but only for the territory you've mapped.

How to Stay in Control (The Checklist)

1. Keep every negative list in place. Nothing about AI Max makes your existing negatives obsolete — they're your foundation. Account-level for universal junk (jobs, free, DIY), campaign-level for intent, ad group-level for fine-tuning.
2. Add brand exclusions as a separate layer. Don't rely on brand-name negatives alone. Set up a brand list and apply brand exclusions so intent-based branded queries are covered too.
3. Schedule search terms reviews — weekly for the first month. This is non-negotiable after enabling AI Max. Use the search term match type segmentation to see which queries came from AI expansion vs. your keywords, and build negatives from what you find. The AI expands your footprint fast; your exclusions have to keep pace.
4. Watch the landing page report too. If URL expansion is on, Google also picks which pages your ads send traffic to. Review it, and set URL exclusions for pages that shouldn't carry paid traffic.
5. Check for conflicts. Negatives that overlap your brand inclusions or core terms can quietly choke performance. Audit the interaction, not just each list in isolation.

The Bottom Line

Same thread as every post in this series: the more automated the internet gets, the more valuable human oversight of your ad spend becomes.

AI Max genuinely gives you more reach without removing your controls — but the controls don't maintain themselves. The AI's job is to expand. Your job (or your agency's) is to inspect what it found and fence off what doesn't belong. More reach, same control — but only if someone's actually watching.

Thinking about turning on AI Max — or already did and the search terms look messy? We'll audit your negatives, brand exclusions, and AI expansion quality — free, no strings. Book your audit here.

Ave Maria Marketing helps local service businesses get more customers through paid ads and AI-powered acquisition systems — automation with human oversight, always.