Automated Bidding — What Google Will Not Tell You About Smart Bidding

What Changed

Enhanced CPC was deprecated for Search and Display campaigns in March 2025. Campaigns not proactively migrated are now running Manual CPC. Google is pushing all advertisers toward fully automated bidding: Maximize Conversions, Target CPA, Maximize Conversion Value, and Target ROAS.

When Smart Bidding Works Brilliantly

Smart Bidding works when you have clean conversion data (minimum 30 conversions per month, ideally 50+), correct conversion values assigned, and a stable account structure. In these conditions, auction-time bidding genuinely outperforms manual management because it evaluates signals no human can process—device, location, time of day, remarketing list, browser, OS—all in real time for every single auction.

When Smart Bidding Fails

Smart Bidding fails when your conversion tracking is broken, your conversion volume is too low, your conversion data includes junk actions (page views counted as conversions), or you make frequent major changes that keep campaigns in learning phase. The learning phase lasts 5-7 days after significant changes, and during that time performance is volatile. I have seen accounts where well-intentioned weekly optimizations kept campaigns perpetually in learning mode—never reaching stable performance.

The other failure mode is Target CPA or Target ROAS set too aggressively. If your target is unrealistic, Smart Bidding will stop spending to avoid exceeding the target—and you will get zero conversions instead of expensive ones. Start with Maximize Conversions (unconstrained) to establish a baseline, then layer on a target once you know your actual achievable CPA.