Google Retiring Dynamic Search Ads in September 2026: The 5-Month Playbook for Google Ads Agencies
DSA is mandatory-off by September 2026. AI Max is replacing it whether agencies choose to migrate or not. Here is what the September deadline actually means and how agencies should respond in the next five months.
On April 15, 2026, Google announced that Dynamic Search Ads will be auto-migrated to AI Max for Search in September 2026. New DSA campaigns cannot be created from September onward via Google Ads, Google Ads Editor, or the Google Ads API. Existing campaigns will migrate automatically whether you choose to initiate the migration or not. AI Max reached General Availability on April 15. You have five months.
What DSA Was and What AI Max Replaces
Dynamic Search Ads were the technical mechanism through which Google Ads agencies maintained meaningful control over campaign targeting and delivery. DSA allowed agencies to specify URL targets, create ad copy tied to specific page content, build negative keyword lists, control which parts of a client's website could trigger ads, and adjust bids based on manual strategy decisions.
That control layer was the practical basis for what Google Ads agencies charged fees to do. Keyword research, negative list management, ad copy creation, URL structure, bid strategy: these were the billable activities that justified retainers. They required human expertise and ongoing attention.
AI Max replaces the entire execution layer. Keyword expansion is automated. Text customisation is handled by AI based on page content and query context. URL selection is automated. Bid strategy is automated. The creative and targeting decisions that agencies built service models around are now Google's algorithm rather than the agency's expertise.
The Performance Question Is Not the Point
Google's published data for AI Max shows 7% more conversions at similar CPA. Independent analysis of 250 AI Max campaigns tells a more complex story: median result was 13% more revenue at 16% higher CPA, and 84% of advertisers saw neutral or negative results compared to DSA benchmarks.
The debate about whether AI Max actually performs better is real, and agencies should run the tests during the voluntary migration window. But the performance question is ultimately secondary to the structural one. DSA is being retired regardless of performance outcomes. The September deadline is not conditional on AI Max proving its performance claims. It is a product retirement schedule.
The 5-Month Window
Between now and September, agencies have a specific window to take three actions that will determine how this transition lands with clients.
The first action is performance baselining. Before any migration, document current DSA performance with enough granularity to make the comparison meaningful after migration: quality score by ad group, conversion path analysis, and the specific negative keywords and URL exclusions currently protecting campaign performance. This documentation demonstrates to clients that the migration was managed deliberately rather than absorbed passively.
The second action is controlled testing. Google has built a one-click A/B experiment tool specifically for the DSA-to-AI Max transition. Running these experiments on mid-sized campaigns before September generates real performance data that can be used in the value conversation before migration is mandatory.
The third action is reframing the service value proposition before September forces the conversation. The agencies that come out of the DSA retirement intact are the ones who understood that their value was never primarily in the execution layer Google is removing. It was in understanding the client's business well enough to direct the AI effectively, in interpreting performance data in the context of the client's broader marketing strategy, and in integrating Google Ads performance with other channels.
The Value Proposition After September
When AI Max is mandatory and execution tasks are automated, the question every Google Ads client will eventually ask is: what am I paying my agency for that the AI is not already doing?
The agencies that have a compelling answer are those that have built value above the execution layer. Strategy consulting, advising on budget allocation, competitive positioning, and channel mix, is not automated by AI Max. Business intelligence, connecting Google Ads performance to client revenue outcomes in the context of the client's sales pipeline, is not automated by AI Max. Integration, building data pipelines that connect Google Ads data to CRM and attribution platforms, is not automated by AI Max.
These service lines survive September intact. They require agencies to have already built the systems and skills to deliver them, not to start building them under pressure when the deadline hits.
The Broader Platform Pattern
DSA is not the only Google execution tool being automated in 2026. Google Customer Match API migration is underway. Google Content API for Shopping shuts down August 18, with migration to Merchant API required. The pattern across Google's advertising products is consistent: manual control layers built for human operation are being replaced by AI systems designed for autonomous operation.
Agencies that treat each transition as an isolated product change are missing the pattern. Google is systematically removing the technical execution layer that agencies built service models on. This is not a temporary disruption. It is a permanent restructuring of what the platform requires human expertise to do.
The agencies that understand this are repositioning now: before the migrations are mandatory, before client contracts are up for renewal in a market where the old value proposition is obviously insufficient, and before competitors who have already repositioned make the comparison uncomfortable. The five-month window is the opportunity. September is the deadline.