Microsoft Ads Drops Max CPC From New Campaigns Starting October 1

Microsoft Advertising will remove the Max CPC setting from new non-portfolio campaigns beginning October 1, 2026, pushing advertisers toward automated bidding controls and performance-based targets.

The move signals a broader industry shift away from manual bid controls and toward algorithm-driven campaign management. For the thousands of advertisers who have relied on Max CPC as a guardrail against runaway individual bids, this change demands a rethink of how campaigns are structured and controlled from the ground up.

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What Is Actually Changing on October 1

Beginning October 1, 2026, advertisers will no longer find Max CPC available when creating new non-portfolio campaigns that use any of the following bid strategies: Target CPA, Target ROAS, Maximize Conversions, Maximize Conversion Value, or Maximize Clicks.

The change is limited to new campaigns only. Existing campaigns created before October 1 that already carry a Max CPC setting will be allowed to keep it. Max CPC also remains fully available for both new and existing campaigns that use portfolio bid strategies.

Two other common strategies — Target Impression Share and Enhanced CPC — are not affected by this update.

Microsoft will first remove Max CPC from the campaign creation interface. Removal from Microsoft Advertising Editor will follow, though a specific date has not been announced. An API update is also expected at a later stage.

Why Microsoft Is Making This Change

Microsoft's stated reason is straightforward: Max CPC can give its automated bidding systems conflicting instructions. An advertiser might ask Microsoft's algorithm to optimise toward a specific cost-per-acquisition target while simultaneously capping how high the system can bid in the very auctions that could help achieve that goal. According to Microsoft, this conflict can occur even when the Max CPC is set above a campaign's average CPC.

The company has also noted it has been making back-end improvements to its automated bidding infrastructure to improve responsiveness and help advertisers hit their targets more consistently. In short, the Max CPC ceiling — intended as a safety control — can quietly work against the algorithm's ability to compete effectively and deliver results.

What Remains Unaffected

It is worth being explicit about what this change does not touch:

• Existing campaigns with Max CPC already in place will continue to operate as configured
• Portfolio bid strategies will continue to support Max CPC for both new and existing campaigns
• Target Impression Share and Enhanced CPC bid strategies are unaffected
• Microsoft Advertising Editor will retain Max CPC functionality until a separate, later date is confirmed

This gives advertisers meaningful flexibility during the transition — there is no forced migration and no automatic removal from live campaigns.

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What This Means for Advertisers Running Paid Campaigns

For advertisers who already run automated bidding without Max CPC, the immediate impact will be minimal. The real adjustment falls on those who habitually pair Max CPC with automated strategies as a safety net.

Understanding the strategic differences between paid search and paid social advertising is increasingly relevant here — as both channels continue consolidating manual controls in favour of algorithm-led bidding, the underlying shift in how advertisers maintain control is consistent across platforms.

Replacing Max CPC With Smarter Controls

Microsoft recommends shifting control to levers that are more directly tied to campaign outcomes:

• Budgets to govern overall spend
• Target CPA and Target ROAS goals to guide the algorithm toward desired returns
• Conversion value rules to signal which audiences, locations, or device types carry more business value
• Seasonality adjustments when short-term demand shifts require a temporary override

Conversion value rules deserve particular attention. By telling Microsoft's system that a specific audience segment or geographic location is worth more to the business, advertisers give the algorithm richer information when it determines bid amounts. This layer of control can partially replace the blunt ceiling that Max CPC once provided — and in many cases, it provides more nuanced direction than a static bid cap ever could.

The Data Quality Problem That Now Matters More

The quality of inputs feeding automated bidding becomes more critical without Max CPC in the picture. Conversion tracking must accurately reflect the actions that genuinely matter to the business. CPA and ROAS targets need to represent what an advertiser is realistically willing to pay for those outcomes — not aspirational figures that leave the algorithm with impossible targets to chase.

The algorithm is only as accurate as the data it receives. Give the system clear and honest instructions and it will generally perform. Give it contradictory or incomplete signals and performance will suffer — often in ways that are difficult to diagnose after the fact.

For advertisers focused on improving PPC return on investment across campaigns, this transition is an opportunity to reassess whether current conversion tracking and target-setting practices are genuinely fit for purpose — not just for Microsoft Ads, but across the entire paid search account.

A Note on Automated Bidding Across Other Platforms

This change does not exist in isolation. Google Ads has been moving in a similar direction for several years, progressively reducing the prominence of manual CPC controls and steering advertisers toward smart bidding. The Microsoft update reflects the same underlying philosophy: that automated systems, given accurate signals and appropriate targets, consistently outperform rigid manual bid ceilings over time.

Advertisers managing campaigns across multiple platforms — including Amazon Ads, where algorithmic bidding controls are equally central to campaign performance — will recognise this pattern. The practical implication is the same regardless of platform: the quality of your inputs, targets, and audience signals now carries more weight than it ever did when manual bid caps provided a fallback.

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How to Prepare Before the Deadline

Microsoft is providing meaningful flexibility with this transition. There is no requirement to strip Max CPC from existing campaigns and no automatic migration will occur. Advertisers who have a specific operational reason to keep Max CPC on current campaigns can do exactly that.

For new campaigns launched after October 1 where manual bid control remains a priority, portfolio bid strategies will continue to support Max CPC. That option keeps a path open without forcing a complete philosophical change overnight.

Audit Your Account Now

The practical preparation window is open. Advertisers should audit where Max CPC currently appears across their account and evaluate why it is being used in each instance. If it is functioning as a genuine performance control, portfolio bidding can fill that role for new campaigns. If it was largely precautionary, the transition to budget and target-based controls may be smoother than expected.

A structured audit should cover:

1. Every active campaign using an affected bid strategy alongside Max CPC
2. Whether each instance is serving a genuine performance function or acting as a passive safeguard
3. Which campaigns, if any, should be migrated to portfolio bidding to retain Max CPC capability after October 1
4. Whether conversion tracking is accurately capturing the actions that inform automated bidding decisions

Update Internal Templates and Build Processes

Internal campaign templates and build processes should also be reviewed. Any workflow that includes Max CPC as a standard setup step for the affected bid strategies will need updating before October 1 to avoid friction when new campaigns go live. This includes documentation, onboarding materials, and any automated campaign build tools that reference Max CPC fields.

Teams managing multiple accounts or working within agencies should prioritise this review early — the more campaigns are built from templates, the greater the risk of errors or delays if those templates are not updated in advance.

Strengthen Conversion Tracking and Value Signals

Before October 1, advertisers should confirm that:

• All conversion actions are tracked accurately and reflect genuine business outcomes
• Conversion values are correctly assigned where Target ROAS is in use
• Conversion value rules are configured to communicate audience, location, or device-level differences in business value to the algorithm
• CPA and ROAS targets are set realistically, based on historical performance data rather than aspirational benchmarks

For further guidance on Microsoft's automated bidding capabilities, the Microsoft Advertising resource hub provides up-to-date documentation on bid strategy configuration and best practices.

The change represents a continued industry-wide consolidation of control within automated systems rather than at the individual bid level — a trend that shows no sign of reversing across major advertising platforms.

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How to Act on This Information

• Audit your current campaigns now to identify every instance where Max CPC is paired with automated bid strategies and decide whether portfolio bidding is the right alternative for future campaigns
• Strengthen your conversion tracking and value rules before October 1 so automated bidding has accurate signals to work with once the Max CPC option is removed
• Update internal playbooks and campaign templates to reflect the new setup requirements and prevent delays or errors when building campaigns after the deadline