If you manage Google Ads campaigns and haven’t touched your Search settings recently, it’s worth pausing to check them — because in a matter of days, Google is going to make some of those decisions for you. Starting September 1, 2026, Search campaigns still running on legacy settings will automatically upgrade to AI Max, Google’s AI-driven automation layer, whether you’ve opted in or not. Here’s exactly what’s changing, what the actual performance data shows, and what to check in your account before the switch flips.
What’s Actually Happening on September 1
Google confirmed in April 2026 that AI Max for Search has moved out of beta after 11 months of testing, and with that milestone came a clear migration mandate. Campaigns using Automatically Created Assets (ACA) or the campaign-level broad match setting will be automatically upgraded to AI Max starting September 1, with no formal opt-out beyond disabling those legacy features ahead of time. Google’s Director of Product Management, Brandon Ervin, framed the shift as a move from static tools to a system that truly understands intent — but for advertisers, the practical reality is more procedural: your account’s targeting and creative logic is about to change, whether you actively chose that or not.
Dynamic Search Ads (DSA) got a partial reprieve. Originally bundled into the same September deadline, Google extended DSA’s auto-upgrade timeline to February 2027 after advertiser feedback that more transition time was needed. New DSA campaigns can no longer be created going forward, but existing DSA campaigns now have a longer runway than ACA and broad-match campaigns before they’re forced into AI Max.
What Changes When the Upgrade Hits
When the auto-upgrade lands, AI Max is configured to mirror your existing legacy settings as closely as possible — DSA campaigns convert into standard ad groups with URL controls preserved, and ACA accounts have search term matching enabled automatically. But there’s an important catch worth flagging to any team relying on this transition running smoothly: the auto-upgrade preserves your old settings, it doesn’t proactively turn on the newer controls AI Max offers, like brand restrictions or text guidelines. An account that gets switched over in September can end up looking functionally identical to August — same blind spots, same missing guardrails — just running under a different automation layer. There’s also a real reporting-continuity risk: historical benchmarks not exported before the auto-upgrade may become partially unavailable, making clean before-and-after performance comparisons harder to produce.
The Performance Claims: What Google Says vs. What Independent Data Shows
This is the part worth reading carefully before you plan Q4 budgets around AI Max. Google’s own performance claims have shifted meaningfully over time — the original May 2025 beta touted 14% more conversions or conversion value at a similar cost; by the April 2026 general availability announcement, that figure had been revised down to an average of 7% lift, measured using the full AI Max feature suite against search term matching alone, based on Google’s internal 2026 data and explicitly excluding retail advertisers.
Independent analysis has told a more mixed story. One agency analyst reported that 99% of AI Max impressions produced zero conversions across roughly 30,000 tracked search terms, and a separate November 2025 analysis of more than 250 retail campaigns found AI Max conversions arriving at roughly 35% lower ROAS than traditional match types. Some of that gap may trace back to how AI Max actually works — Google has clarified that its search term matching relies on inferred intent rather than literal query text, which can produce broader, less predictable matching than advertisers are used to from traditional keyword targeting. The practical takeaway: treat Google’s lift numbers as a reasonable starting expectation, not a guarantee, and validate performance against your own account data rather than the published averages.
Why This Is Bigger Than Just an Automation Setting
The September deadline isn’t the only reason to pay attention here. At Google Marketing Live in May 2026, Google confirmed that access to newer AI-native ad formats — including Conversational Discovery ads and Highlighted Answers — requires AI Max for Search or Performance Max with text customization; legacy Search configurations simply can’t reach those formats at all. In other words, this isn’t purely a backend automation upgrade — it’s increasingly the gateway to where Google Search advertising is headed next. The pattern isn’t unique to Google, either: Microsoft retired its own Predictive Matching feature in July 2026 in favor of a comparable AI Max-style automation layer, suggesting this shift toward AI-driven, less keyword-literal targeting is becoming an industry norm rather than a single-platform experiment.
What to Check Before September 1
A few concrete steps are worth prioritizing in the days you have left:
- Audit your account for any Search campaigns currently using Automatically Created Assets or campaign-level broad match — these are the ones affected by the September deadline specifically.
- Export historical performance data now, before migration, so you have a clean baseline for pre- and post-upgrade comparisons.
- Migrate voluntarily if you can, rather than waiting for the automatic switch — voluntary migration lets you actively configure brand controls, text guidelines, and URL settings instead of inheriting whatever gets mirrored over by default.
- Budget for a re-learning period. Smart Bidding systems typically need 30 to 60 days to stabilize after a major campaign structure change, meaning reliable post-upgrade performance data may not be available until November or December — worth factoring into Q4 planning if your account runs time-sensitive campaigns.
The Bottom Line
The September auto-upgrade isn’t optional, and waiting it out doesn’t actually avoid the transition — it just means Google decides your default settings instead of you. Whether AI Max ultimately delivers Google’s stated 7% lift, underperforms like some independent analyses suggest, or lands somewhere in between will likely depend heavily on how deliberately each account is configured going in. The advertisers coming out ahead of this shift aren’t the ones debating whether to adopt AI Max — they’re the ones who migrated on their own terms, with their own controls, before Google made the choice for them.
Has your team already migrated to AI Max, or are you planning to let the September auto-upgrade handle it? Share your approach in the comments, and subscribe for more coverage of the platform changes shaping paid search in 2026.