Google Ad Manager Shifting Display Impressions to Begin-to-Render in February 2027

Google is quietly fixing a decades-old quirk in its advertising plumbing.

In an email notification sent out to Google Ad Manager network partners, the tech giant announced it will soon abandon its long-standing “count-on-download” (COD) method for display ads. Instead, Google is finally migrating to the industry-standard “begin-to-render” (BTR) methodology.

The shift itself is scheduled to take effect on February 17, 2027. Frankly, I believe this change is incredibly overdue. However, it is almost certainly going to cause some mild panic among yield optimization and ad operations teams when their dashboard numbers suddenly start to slide.

When you stop counting things that never actually showed up on a screen, the baseline numbers are bound to change.

So, why does this distinction actually matter? Let us break down the technical differences between how Google registers your traffic today versus how they will handle it in 2027:

• Count-on-download (The current state): Ad Manager counts a display impression the moment the ad server responds to a request and the creative asset starts downloading to a user’s device. It does not matter if the user immediately scrolls away, closes the tab, or has a terrible connection that kills the page load before the ad is visible.
• Begin-to-render (The 2027 standard): In accordance with Interactive Advertising Bureau (IAB) and Media Rating Council (MRC) guidelines, an impression is only logged once the creative successfully loads and starts visibly rendering on the actual physical user device.

What does this mean for publishers? Well, expect your total reported impressions to take a hit. Any ad that began downloading but was abandoned before rendering will vanish from your reports.

While that might sound like a penalty, it actually aligns publisher metrics with buy-side Demand-Side Platforms (DSPs).

It should, in theory, reduce discrepancy disputes and lower administrative friction.

The update will apply broadly to display inventory across the web, mobile web, and Connected TV (CTV) banner environments. No action is required from network admins; Google is flipping the switch automatically.

If your ad ops team spends too much time manually reconciling differences between Google and third-party buyers, this change should fix that specific headache.

You can find more detail in the Google Ad Manager Help Center as the rollout date approaches.