The AI Max Migration Playbook: What Small Business Owners Need to Do Before September 2026

If you run Google Ads for your small business and you’ve been using Dynamic Search Ads, automatically created assets, or campaign-level broad match, you have a deadline coming. In September 2026, Google is automatically upgrading these legacy features to a new system called AI Max for Search. You don’t get to choose whether the upgrade happens. You only get to choose whether you let Google flip the switch for you, or whether you take control of the migration yourself.

This isn’t optional housekeeping. AI Max is one of the biggest changes to how Google Ads works in years. It changes how your ads are matched to searches, how your ad copy is written, and where people land when they click. For a small business with a tight ad budget, getting this transition right could be the difference between a profitable account and one that bleeds money on irrelevant clicks for months.

Here’s what AI Max actually is, why September matters, and the five things you can do right now to prepare.

What AI Max actually does

AI Max for Search is a bundle of features that uses Google’s AI to expand who sees your ads, what your ads say, and where those clicks land. It has three main parts.

Search term matching uses AI to find searches that are related to your business but might not match your exact keyword list. If you sell organic dog food in Perth, AI Max might show your ads for natural pet nutrition searches in Cottesloe even if that exact phrase isn’t in your keyword list.

Text customization uses AI to rewrite your ad headlines and descriptions to match the specific search someone types. Instead of one fixed ad showing for many different searches, the AI tweaks the wording to sound more relevant for each query.

Final URL expansion lets Google send the click to a different page on your website if it thinks that page is a better match for what the searcher wants. If someone searches for puppy food delivery and you have a dedicated puppy food page, Google can send them there even if your ad’s destination URL was your homepage.

Why September is your deadline

Google announced in April 2026 that starting in September, any campaign still using Dynamic Search Ads, automatically created assets, or campaign-level broad match settings will be automatically upgraded to AI Max. You won’t be asked. You’ll get a notification, and then it will happen.

The risk of doing nothing is that the auto-upgrade uses default settings that may not be right for your business. By migrating earlier, you control the configuration, you can run a proper test, and you have time to adjust before the switch becomes mandatory.

Discover also: What the Google March 2026 Core Update Means for Your Website

Step 1: Audit your current campaigns

Before you change anything, get a clear picture of what’s working. Pull your search terms report for the last 90 days. Look at which queries are actually converting, which are spending money without converting, and which keywords are driving most of your revenue.

Document this. Take screenshots. Save reports. When you flip on AI Max and your data starts shifting, you need a baseline to compare against.

Pay special attention to your top 20 converting search queries and your top 20 wasted-spend queries. Those are the patterns AI Max is going to interact with first.

Step 2: Build a stronger negative keyword foundation

AI Max expands the queries your ads can show for. That’s good when the new queries convert. It’s expensive when they don’t. Tight negative keywords are the safety net that stops AI Max from spending your budget on irrelevant searches.

Start with the obvious negatives that don’t fit your business: free, DIY, jobs, courses, wholesale, second hand, used. Then add industry-specific ones. A Perth dentist would add negatives like dental nurse jobs, dental assistant course, and free dental clinic.

Build these into a shared negative keyword list that you apply to every Search campaign. Review it weekly for the first month after enabling AI Max, because new irrelevant queries will surface and you’ll need to add them as negatives.

Step 3: Set up text guidelines and brand controls

This is the new lever AI Max gives you that didn’t exist with Dynamic Search Ads. Text guidelines let you tell Google’s AI what tone to use, what claims to avoid, and what messaging boundaries to respect when it generates ad copy on your behalf.

For a small business, write text guidelines that protect your brand voice. Tell the AI not to make pricing claims unless you’ve explicitly approved them. Tell it not to use superlatives like best or cheapest if those words could trigger competitor complaints. Specify the customer benefits you want emphasised.

Set brand restrictions so your ads don’t show for competitor brand searches unless you want them to. Set location controls so your ads don’t appear in suburbs you don’t service.

Step 4: Run a small controlled experiment

Google offers one-click experiments inside the AI Max setup. Use them. Take one of your existing Search campaigns and run a 50/50 split between your current setup and an AI Max version with all features enabled.

Run the experiment for at least four weeks if your conversion volume allows. Look at three numbers: cost per conversion, conversion rate, and quality of leads. If you can track lead quality through your CRM, that signal matters more than any platform metric.

Step 5: Plan your full migration based on data, not hype

Once your experiment finishes, make a decision based on what actually happened in your account. Google says AI Max delivers a 7 percent lift in conversions on average across its non-retail advertisers. Your account may see more, less, or none. The point of the test is to find out.

If the test wins, roll out AI Max to your other Search campaigns one at a time, not all at once. Keep monitoring weekly for at least two months after each rollout.

Read also: Google Ads in AI Overviews: How to Get Your Ads Appearing in AI Search Results

The local business advantage

There’s a real upside to AI Max for local Perth businesses. Manual keyword lists tend to miss long-tail local variations. Someone searching for an emergency plumber in Joondalup on a Saturday morning might not match your keywords, but AI Max could pick that up and send them to your booking page. Captured properly, that’s a high-intent lead you would have missed.

The catch is that the same expansion can also pick up plumber jobs in Joondalup or plumber courses on Saturday if your negatives are weak. Discipline on negatives is the difference between AI Max being a profit driver and a budget drain.

Common mistakes to avoid during the transition

The first mistake is enabling all AI Max features at once without watching your search terms report. The whole point of running a controlled migration is to spot expansion problems early. Check your search terms weekly for the first month and add negatives aggressively.

The second mistake is leaving final URL expansion on when your website has weak service pages. If Google sends a high-intent click to a page that doesn’t convert well, you’ve wasted that lead. Either fix the page or turn off final URL expansion until you can.

The third mistake is judging the experiment too early. AI Max needs at least three to four weeks to gather enough data to produce reliable results. Pulling the plug after a bad first week is a common way to throw away genuine learnings.

Don’t wait for September

The single biggest mistake you can make is to ignore this transition until Google does it for you. Default settings rarely match what your business actually needs. By starting now, you control the variables, you collect proper data, and you walk into September already knowing what works.

If you only do one thing this month, run that experiment. Everything else flows from understanding how your specific account behaves under AI Max before the auto-upgrade forces the issue.

Ready to get ahead of the September deadline? Let’s Talk!→