Microsoft Ads Drops Max CPC: What to Do Before Oct. 1

Microsoft Advertising is deleting your bid ceiling. Starting October 1, 2026, Max CPC disappears from every new campaign running Maximize Conversions, Maximize Conversion Value, or Maximize Clicks. No in-platform banner most people will not

Microsoft Advertising is deleting your bid ceiling.

Starting October 1, 2026, Max CPC disappears from every new campaign running Maximize Conversions, Maximize Conversion Value, or Maximize Clicks. No in-platform banner most people will notice. An email in August, a follow-up in September, and now a deadline sitting three days out. If you manage your own Microsoft Ads account and haven't touched your bid strategy settings since you set them up, this is the change that finally forces your hand.

It's a small setting, buried a few clicks into a campaign you probably built once and left alone. That's exactly why it's worth ten minutes now instead of a surprised phone call to whoever manages your account in November.

What Actually Disappears on October 1

Max CPC was the one number that let you sleep at night while an automated bid strategy ran your account. You'd hand Microsoft a conversion or click goal, then set a ceiling so the algorithm couldn't pay $40 for a click that should cost $4. After October 1, that ceiling is gone for any new campaign built on the three strategies most small accounts actually use.

Existing campaigns are safe, for now. Anything created before the deadline that already has Max CPC attached keeps it. Portfolio bid strategies, the kind agencies use to manage bids across multiple campaigns at once, keep the option entirely. It's standalone Maximize Conversions, Maximize Conversion Value, and Maximize Clicks on brand-new campaigns that lose the guardrail.

That "new campaign" line is doing more work than it looks like. Launch a seasonal promotion, open a second location, add a product line: any of those is a reason to spin up a fresh campaign, and every one built after October 1 inherits this by default whether you thought about bidding strategy that day or not. You don't get to opt an old account out of a change that only touches campaigns you haven't built yet.

Why Microsoft Says the Cap Was the Problem

Microsoft's own framing is that Max CPC was fighting the algorithm it was supposed to support. You'd set a target CPA or ROAS, then cap individual bids below what the system calculated it needed to pay to hit that target. Navah Hopkins, Microsoft's Ads Liaison, laid out the reasoning directly after advertisers pushed back:

Max CPCs override stated goals and can lead to spend pacing irregularities. We see that advertisers who lean on conversion-based bidding and use targets have an easier time meeting their goals than those who rely on legacy controls like Max CPC.

— Navah Hopkins, Microsoft Ads Liaison

That's a reasonable argument if your account has the conversion data to back a target in the first place. It's a much worse deal if it doesn't, and most small accounts don't.

The Setup Most Bing Advertisers Never Finished

Here's the part the migration checklists everyone else published this month don't spend enough time on. Maximize Conversions and Maximize Conversion Value both require a working UET tag and a real conversion goal before Microsoft will optimize anything, per Microsoft's own bid strategy documentation. Maximize Clicks doesn't require any of that. It just spends your budget as fast as it can to buy clicks, full stop.

If you've been running Maximize Clicks with a Max CPC ceiling because you never got around to wiring up conversion tracking properly, that ceiling was doing double duty. It was your only defense against overpaying, on a strategy that was never measuring whether any of the clicks turned into a lead or a sale. Remove the ceiling and you haven't lost a bidding nuance. You've lost the one number standing between your budget and an algorithm optimizing for volume alone.

This is more common than it sounds. A service business sets up a Microsoft Ads account once, copies the Google Ads structure over because it's faster than starting fresh, picks Maximize Clicks because it doesn't demand a conversion goal to launch, and caps the cost per click so a slow week doesn't turn into a blown budget. That setup runs untouched for two years, quietly working, because the cap was doing the one job that mattered. October 1 removes that job from the account without touching anything else about it.

Who This Actually Hits Hardest

The 30-conversion floor isn't evenly distributed across small businesses. A local ecommerce shop running promo campaigns can clear 30 conversions in a busy week. A roofing company, a commercial law firm, a B2B software vendor selling a $20,000 annual contract: none of those accounts see 30 leads in a month, and some don't see 30 in a quarter. Those are exactly the accounts where Maximize Conversions and Target ROAS are least likely to work as advertised, and exactly the accounts most likely to have been leaning on Max CPC as their real form of cost control instead.

There's a second group worth naming: businesses with genuinely seasonal demand. A holiday-driven retailer or a tax-season accounting firm can swing from 40 monthly conversions in peak season to under 10 in the off months. That account crosses the 30-conversion line in both directions over a single year, which means the bid strategy Microsoft is pushing everyone toward can start optimizing well, then quietly stop, then start again, without anyone changing a setting on purpose.

What Happens If You Do Nothing

Nobody's account gets suspended over this. The failure mode is quieter: you create a new campaign in November because a product launched or a location opened, Microsoft applies the current defaults, and there's no field to fill in the ceiling you'd have set on instinct a year ago. If your conversion volume is healthy and your tracking is solid, that's a non-event, maybe even an improvement. If it isn't, the algorithm spends toward its target with no upper bound on any single click, and the first sign you'll see is a CPA report three or four weeks later that's drifted 20 to 30% off where it used to sit.

Worse is the account that sits right at the edge of that 30-conversion line. It clears the threshold most months, so Target CPA looks like it's working, then a slow month drops it below 30 and the strategy stops optimizing entirely without any alert telling you that's what happened. Without Max CPC as a backstop, that's a month of spend running on stale bidding logic with no ceiling and no active target, and nothing in the interface flags it as urgent.

That gap, between the setting changing and someone noticing, is where the actual damage happens. It's the same pattern we flagged when Google auto-upgraded Dynamic Search Ads into AI Max back in August: the platform doesn't break loudly, it drifts quietly, and a monthly glance at the dashboard catches the drift after the budget's already spent.

Two Platforms, One Deadline

Microsoft isn't the only platform picking October 1, 2026 as a hard cutover. Google's Local Services Ads started billing business-hours missed calls the same day, a completely different mechanism on a completely different product, landing on the exact same calendar date. Neither company coordinated with the other. Both decided the first of October was the moment to hand more control to an algorithm and stop asking advertisers to babysit a manual setting.

That's not a coincidence worth reading conspiracy into. It's a pattern worth reading operationally: platform defaults change on the vendor's schedule, not yours, and October 2026 happens to be a month where two of them landed on the same day. If you run budget across Meta, TikTok, Google, and Microsoft the way most of our clients do, this is a good month to actually check every account instead of just the one you remembered.

The Checklist Before October 1

Four things, in order, if you're doing this yourself:

1. Pull your last 30 days of conversions for every Microsoft Ads campaign running Maximize Conversions, Maximize Conversion Value, or Maximize Clicks. Compare against the 30-conversion floor. Below it, a bid strategy switch is coming whether you plan for it or not.
2. Confirm your UET tag and conversion goals are actually firing, not just installed. A tag that stopped reporting six months ago looks identical to a healthy one until you check the numbers.
3. Decide your real cost ceiling now, in writing, even though there's no field left to enter it. If a campaign creeps past that number, that's your trigger to pause it manually or hand the watching off to something that doesn't forget.
4. Delay creating any new standalone campaign until the first three are done, if you can. Every campaign built after October 1 inherits this by default; every one built before it doesn't.

For most owners running their own account between everything else the business needs, step three is where this quietly stops happening. A written ceiling that nobody checks for three weeks isn't a ceiling. This is exactly the kind of standing rule workflow automation is built for: not a one-time migration, but a check that fires the moment an account drifts instead of a month later in a spend report we're both looking at after the money's gone.