Another manual lever just got pulled out of the cockpit. Starting Oct. 1, Microsoft Advertising will no longer let advertisers set a Max CPC when they create new campaigns on several standalone automated bidding strategies, according to Search Engine Land.
What exactly changes
New campaigns built on standalone Maximize Conversions, Maximize Conversion Value and Maximize Clicks lose the Max CPC field. Microsoft’s September 7 advertiser email expanded the scope: the restriction will also hit Target CPA and Target ROAS campaigns, beyond the three strategies reported in August.
What survives, for now: Target Impression Share, enhanced CPC and portfolio bid strategies keep Max CPC controls, per Microsoft Advertising Product Liaison Navah Hopkins.
Existing campaigns aren’t force-migrated. Anything created before Oct. 1 keeps its Max CPC setting. But there’s a catch that deserves a highlighter: Microsoft says removing Max CPC after that date is irreversible — you can’t add it back later.
There’s a second date too. Jan. 12 is the deadline for API users, tool providers and Google Import. After that, Max CPC won’t be supported for new campaigns, or for existing campaigns that aren’t already using it.
Why Microsoft is doing it
The company’s argument is that CPC caps fight the algorithm. A hard ceiling can override the performance goal you actually stated and cause spend pacing to wobble. Microsoft says advertisers running conversion-based bidding with tCPA and tROAS have an easier time hitting their goals than those leaning on legacy controls like Max CPC.
The preferred inputs now are the ones tied to business outcomes:
- Budgets
- Target CPA
- Target ROAS
- Conversion value rules
- Seasonality adjustments
Hopkins also noted campaigns can outperform their tCPA or tROAS targets whether or not they’re budget-limited, and recommended conversion value rules where relevant so the algorithm knows which conversions actually matter more to the business.
Why it matters for performance teams
Max CPC has always been the cheap insurance policy. It’s the thing you set when you don’t fully trust the auction, when a competitor goes berserk on a head term, or when a new account has thin conversion data and you want a hard stop on runaway clicks.
Take that away and your safety net becomes budget plus target quality. That’s fine if your conversion tracking is clean, your volumes are healthy and your targets are realistic. It’s uncomfortable if you’re running a low-volume B2B account where 12 conversions a month are supposed to teach a bidding system how to behave.
Whether results improve comes down to three things: the quality of your conversion data, the targets you set, and how well Microsoft’s system reacts to those signals. Two of those three are entirely in your hands.
A pre-deadline checklist
Hopkins suggests using optimization experiments to test removing Max CPC from existing campaigns before the deadline — a controlled way to see how bidding behaves with more freedom while you still have the option.
Practical order of operations for the next few weeks:
- Audit which campaigns currently rely on a Max CPC and note the strategy each one uses.
- Experiment on your highest-spend capped campaigns first. Watch CPC, CPA/ROAS and volume, not just CPC.
- Fix the signal before you loosen the leash: dedupe conversion actions, confirm values are passing, apply conversion value rules where different conversions carry different worth.
- Consider portfolio strategies if a CPC ceiling is genuinely non-negotiable for a client or category, since those retain the control for now.
- Don’t strip caps casually after Oct. 1 on legacy campaigns — that decision can’t be undone.
Mind the calendar
The timing is the sting. Oct. 1 lands right as teams launch and restructure for peak season. If you plan to spin up new Microsoft campaigns for Black Friday and holiday, assume no CPC ceiling and budget accordingly. Better to discover how your account behaves in a September experiment than in a Q4 launch.
Microsoft says more updates on the future of Max CPC are coming. Read that as a signal: the control is on a glide path out, not just restricted for new builds. Get your targets and conversion data in shape now.
Source: Search Engine Land
