On Oct. 1 Microsoft Advertising will stop letting advertisers set a maximum cost‑per‑click (Max CPC) when they create certain new standalone automated bidding campaigns. If you build new campaigns using Maximize Conversions, Maximize Conversion Value or Maximize Clicks after that date, you won’t be able to add a CPC cap — forcing you to rely on conversion‑focused levers such as target CPA (tCPA), target ROAS (tROAS), budgets and conversion value rules.
Why this matters now
Max CPC has been a simple defensive control: cap the cost of any single click to avoid surprise spend. Removing that option on new standalone Maximize campaigns narrows campaign‑creation controls and shifts the onus onto conversion data and outcome‑based targets. That matters for anyone launching campaigns or restructuring accounts ahead of high‑volume periods like the holidays.
What’s changing — and what remains
Starting Oct. 1, advertisers creating new campaigns with the standalone Maximize Conversions, Maximize Conversion Value or Maximize Clicks bid strategies will no longer be offered the option to set a Max CPC. Campaigns created before the cutoff will keep their existing Max CPC settings.
Microsoft confirmed exceptions: portfolio bid strategies will continue to support Max CPC, and other bidding strategies including Target Impression Share and enhanced CPC (eCPC) will also retain the option to set a Max CPC. Microsoft’s product liaison Navah Hopkins said the company will provide further updates on Max CPC later.
Microsoft’s rationale — and the trade‑offs for advertisers
Microsoft argues that hard CPC caps can block automated bidders from reaching conversion and value targets and can create erratic spend pacing. The company is pushing advertisers to express objectives through controls tied directly to outcomes: budgets, tCPA/tROAS, conversion value rules and seasonality adjustments.
The trade‑off is straightforward. If your conversion tracking, value weights or seasonality inputs are accurate, outcome‑based bidding can chase higher‑value clicks that a CPC cap would prevent. If your conversion signals are weak or misconfigured, relinquishing CPC caps risks unpredictable spend or poorer ROI.
Immediate actions to take before Oct. 1
1) Audit conversion tracking and values. Confirm conversion actions, attribution windows and value settings match business priorities. Outcome‑driven bidding only works when the conversion signals are reliable.
2) Run experiments on existing campaigns. Use Microsoft’s optimization experiments to test removing Max CPC now. Experiments show how the bidder behaves without caps and help you calibrate tCPA or tROAS targets before the option disappears for new standalone campaigns.
3) Use portfolio strategies if you need Max CPC. If a Max CPC safeguard is essential for specific launches, create campaigns under portfolio bid strategies or use other bidding modes that retain that control, at least temporarily.
4) Reassess budgets and seasonality settings. Without per‑click caps, budgets and seasonality adjustments become your primary tools for pacing and managing spend volatility.
5) Plan for iteration. Expect to revisit targets and value rules after initial tests. Microsoft notes campaigns can outperform tCPA or tROAS when signaled correctly, but only if the underlying data and targets are accurate.
Practical implications for campaign strategy
Advertisers will end up balancing three levers: targets (tCPA/tROAS), budgets (for pacing) and conversion value rules (to prioritize types of conversions). For new standalone Maximize campaigns, those levers replace direct CPC control — which means teams that rely on CPC caps for risk management need to formalize testing and escalation paths now.
What to watch next
Track experiment results closely, monitor performance volatility after any rollout, and be ready to shift campaigns into portfolio strategies if you need explicit CPC controls. Watch Microsoft’s future announcements for additional changes to Max CPC.
If you manage seasonally sensitive budgets, start testing now: experiments before Oct. 1 give you data to set realistic tCPA/tROAS targets and avoid surprises when the restriction goes into effect.
