Google Ads Switches Discover Billing to CPM for View-Through Conversions

Starting July 15th, some Demand Gen campaigns on Discover will shift from pay-per-click to pay-per-impression pricing. Here's what it means for your ad spend.

The 5-second version

  • Google is moving select Demand Gen campaigns on Discover from CPC to CPM billing starting July 15th, 2026.
  • The change only affects campaigns with view-through conversion (VTC) optimization enabled; other campaigns remain unchanged.
  • This billing shift aligns Google's charging model more closely with how VTC optimization actually measures success.

Google Ads is tightening the link between how it charges you and what you're actually optimizing for. Starting July 15th, 2026, some Demand Gen campaigns on Discover will move from cost-per-click (CPC) billing to cost-per-thousand-impressions (CPM) pricing, according to Search Engine Land.

What's Changing and Who It Affects

The billing shift applies only to Demand Gen campaigns running on Discover that have view-through conversion (VTC) optimization enabled. The change hits a limited number of advertisers. If your campaigns don't use VTC optimization, nothing changes for you.

View-through conversions measure success differently than clicks. VTC tracks when someone sees your ad and then converts later, without necessarily clicking. That's why Google is reorienting the billing model. You're paying for impressions that drive conversion behavior, not individual clicks.

Why This Matters for Your Budget

If you're one of the affected advertisers, your cost structure changes on July 15th. CPC billing charges you per click; CPM charges you per thousand impressions. The two models produce very different cost-per-conversion outcomes depending on your click-through rate and impression volume.

  • Review your current Discover campaign performance now, especially click-through rates and conversion lag
  • Calculate what your CPM equivalent would be based on recent spend and impression data
  • Check whether VTC optimization is actually driving your conversions; if not, you can disable it to stay on CPC
  • Notify your team or agency so billing forecasts and reporting don't get caught off guard

Google has been gradually aligning billing and optimization goals across its ad products. This move reflects a broader strategy to make you pay for the outcome you're actually pursuing, not a generic interaction metric. If VTC optimization is working for you on Discover, the CPM switch may be neutral or even positive. If you've enabled it by accident or it's underperforming, now is the time to adjust.

Questions owners ask

Will this billing change affect all my Demand Gen campaigns?

No. Only Demand Gen campaigns on Discover that have view-through conversion (VTC) optimization enabled will shift to CPM billing. If you're not using VTC optimization, your campaigns stay on their current billing model.

When does the switch to CPM happen?

Google has notified advertisers that the change to CPM billing for affected campaigns takes effect on July 15th, 2026.

Why is Google making this change?

The shift links the billing model more directly to how VTC optimization works. VTC measures success by impressions that lead to conversions rather than immediate clicks, so CPM pricing better matches that goal.

Do I need to do anything if my campaigns are affected?

Review your current CPC spend and conversion patterns now so you can forecast CPM costs accurately. If you don't want to switch billing models, you can adjust your campaign settings to disable VTC optimization before July 15th.

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