Google will change the rule that decides which display impressions advertisers are billed for in Campaign Manager 360 and Display & Video 360 in February 2027, replacing an "on-download" trigger with "begin to render," according to the Display & Video 360 Help Center page listing the platform's upcoming changes, last updated on August 21, 2026.

In Short

Google is changing the moment at which a display ad bought or served through its advertiser tools becomes something an advertiser pays for: from February 2027, the ad's files have to finish arriving in the browser, rather than the ad's code merely starting to run. That touches every advertiser buying display through Display & Video 360 or serving it through Campaign Manager 360, and Google expects the number of billed impressions to fall slightly. Google described a nearly identical switch for September 2025, and the new notice does not say what became of that earlier timetable. No settings need changing, according to Google, but invoices and reports from February 2027 onwards will sit on a stricter count than those before it.

A single entry at the bottom of a Q3 page

The change appears as the last entry on a Help Center page titled "Coming soon: Display & Video 360 updates in Q3 2026." It sits under the cross-platform heading, below a dozen other entries on audio targeting, exchange names, brand suitability and conversion measurement, and it is the only item on the page dated in 2027. No specific day in February is given.

The entry moves the billed display count in both products from count-on-download to begin-to-render measurement. According to Google, the purpose is to align both platforms with the standards of the Media Rating Council, which the page abbreviates as "MCR," in order "to support continued accreditation and delivering high quality measurement for advertisers."

Two sentences carry the commercial substance. Impressions counted under the new method "are more likely to have had a tangible opportunity to be seen," according to Google. And because the method is stricter, advertisers can expect "a slight decrease in overall billed impression volume." Like several other entries on the page, it ends by telling advertisers that nothing is needed of them: "No additional actions are required."

The operative word is billed. Display & Video 360 already reports begin-to-render metrics. Among the Media Rating Council-accredited metrics affected by invalid impression counting changes scheduled for the week of October 7, 2024were Invalid Begin to Render Impressions and General Invalid Traffic (GIVT) Begin to Render Impressions. What changes in February 2027 is the unit on which invoices are calculated.

Where the count moves

Both methods are client-side. An impression is logged by what happens on the user's device, not by the ad server's decision to send an ad. The difference lies in which event on that device counts.

Under the old approach, which Google's page calls on-download, an impression was counted "when the ad code payload started executing in the browser or app." Under begin to render, the new method "only records an impression when the ad's creative assets have finished downloading to the browser," according to Google.

The distance between those two moments defines the population that leaves the invoice: impressions whose ad tag began running but whose image, HTML5 bundle or other creative files never finished arriving. That can happen when a reader closes a tab or follows a link before the creative completes, on a congested mobile connection, with a heavy creative file, or when a page tears down an ad slot before its contents land. Google does not say which of these cases account for the expected decrease, nor how often they occur on its inventory.

A naming wrinkle sits inside Google's own text. The standard is called begin to render, yet the Display & Video 360 definition describes a download-completion trigger and says nothing about drawing the ad. The Desktop Display Impression Measurement Guidelines, version 7.1, finalized in October 2017 by the Media Rating Council, the IAB Technology Laboratory and the Mobile Marketing Association, require that an ad has loaded and has at least started to render. When Google later wrote to AdSense publishers about the same switch, it described a count that happens once an ad has loaded and started to render on the user's device. Whether the Display & Video 360 wording is shorthand for the same event or reflects a different implementation point is not clear from the page.

Apps raise a second question. Google's description of the old method refers to "the browser or app"; its description of the new one names only the browser. For mobile apps, Display & Video 360 already works to a separate rule. In April 2020 Google said that impressions, including billable impressions, on OMID-enabled mobile app display inventory would be counted only when one pixel of the creative is on screen, a threshold stricter than either of the methods described on the page. The February 2027 entry does not say whether that rule is touched.

Nor is begin to render a test of exposure. An ad placed far below the visible part of a page can begin rendering without a single pixel reaching the screen. Viewability for display, under industry standards, requires 50% of an ad's pixels in view for one continuous second; begin to render requires only that the creative has arrived. Google's phrase about a "tangible opportunity to be seen" describes a probability, not a measurement.

A change Google has scheduled before

The harder question is timing. In August 2025, Display & Video 360 users were told that billed display counting would move from on-download to begin to render throughout September 2025. That notice covered third-party hosted display ads in Display & Video 360 and display ads hosted by Campaign Manager 360, including Display & Video 360 display ads hosted through Campaign Manager 360. Video, native and other formats measured through tracking pixels were excluded. It, too, warned of a slight decrease in billed impression volume. In November 2025, Campaign Manager 360 was again described as moving its display impression counting from on-download to begin-to-render during 2025.

The August 21, 2026 page refers to neither date. Its warning of a slight decrease in billed volume echoes the 2025 notice almost word for word. Three readings fit the documents: the 2025 switch was postponed; it altered reported figures while invoices stayed on the older basis; or it covered a narrower slice of inventory than the February 2027 change. Google's page confirms none of them. Coverage of the Q3 2026 page published on September 5 flagged the same dating problem.

This is not an academic distinction. Comparisons of cost per thousand impressions across the break depend on which basis applied to invoices issued in the 17 months between September 2025 and February 2027. If billing moved in 2025, the February 2027 entry may change little. If it did not, the break in the series falls next year. Which is it? The page does not say.

Accreditation as the stated motive

The Media Rating Council has operated since 1963. It grants accreditation after independent audits by certified public accounting firms, repeated annually, the same process that preceded Integral Ad Science's accreditation for server-to-server measurement on Amazon DSP in November 2025. Google does not say which of its accreditations would be at risk without the change, or whether an audit prompted it.

The underlying requirement is old. The 2017 guidelines gave the industry a one-year grace period, after which compliance with the begin-to-render standard became a condition of accreditation in late 2018. If February 2027 is the operative date for invoices, the billed count in both Google products reaches that standard more than nine years after the guidelines were finalized.

At least one rival has been reporting on the new basis for some time. Amazon DSP received Media Rating Council accreditation for display begin-to-render impressions in May 2024, covering third-party exchanges across desktop, mobile web and mobile in-app, as well as Fire TV. That accreditation applies only to metrics reported in Amazon's Industry Standard custom report template, a limitation that shows how narrowly such approvals can be scoped. Reporting accreditation and billing basis are separate questions, and the Amazon accreditation addresses only the first.

Google's own begin-to-render reporting has moved several times. For invalid-traffic detection changes on July 14, 2025, the company estimated a 100% increase in Invalid Begin to Render Impressions and in GIVT Begin to Render Impressions, and a 30% increase in Inactive Impressions. Those were specific figures. For the February 2027 billing change, the only guidance is the adjective "slight."

The seller side moves in the same month

Eleven days after the Display & Video 360 page was last updated, Google emailed AdSense publishers with a date: their display impression counts move from count-on-download to begin-to-render on February 17, 2027. Google Ad Manager is making the same change and gives its publishers a method to estimate the effect, which AdSense publishers do not receive. Neither the AdSense email nor the related documentation said whether publisher earnings move with the count.

The result, if both dates hold, is that buyer and seller counts inside Google's stack converge on the same trigger in the same month. For a Display & Video 360 purchase on Google's own exchange, the advertiser's billed impression and the publisher's counted impression will rest on a single event. For purchases on third-party exchanges, the seller's count depends on that exchange's methodology, which the Display & Video 360 page does not address. The Display & Video 360 entry also gives only a month, so it is not certain that the buy side switches on February 17.

The last comparable shift touched both sides of Google's business as well. DoubleClick products had moved to downloaded impressions by January 2018, and AdSense switched from served to downloaded impressions in May 2018. Google told publishers at the time that impression counts might fall while impression RPM, click-through rate and other impression-based ratios improved, and that earnings would not be affected. In 2027, buyers face the arithmetic mirror image.

Publishers are already adjusting. On August 4, 2026, Ezoic changed its ad serving so that display units render only as they approach the viewport, cutting display impressions by about 25% and lifting viewability to 87%, and positioned the move as preparation for the February 2027 counting change. That was a supply decision broader than anything begin to render requires. Deferred rendering carries its own trade-off: with lazy loading, a reader who scrolls quickly can pass a slot before its creative finishes, and after February 2027 such a pass produces no counted impression at all. On Ad Manager pages, two Google Publisher Tag parameters, renderMarginPercent and fetchMarginPercent, govern how early slots fetch and draw. The volume of billable impressions a page can generate is therefore shaped partly by settings on the seller's side of the auction.

What a slight decrease leaves open

The arithmetic runs in two directions, and the page does not say which applies. If a line item's spend holds steady while billed impressions fall, the effective cost per thousand billed impressions rises. If Display & Video 360 simply stops charging for impressions that never complete, spend for the same auctions won falls instead, and budget pacing would presumably buy additional volume to compensate. Click-through rates and other ratios built on impressions will rise mechanically as the denominator shrinks, much as Google told AdSense publishers in 2018.

Reconciliation is a second pressure point. The IAB's Direct Buy contract framework, released in February 2026, makes Media Rating Council standards the default reference for measurement definitions, asks the parties to name a controlling measurement in each order, and sets a 10% discrepancy threshold above which good-faith reconciliation begins where the controlling count is lower. Where Campaign Manager 360 is the controlling measurement, its count changes basis in February 2027. The gap between that count and the figures produced by publishers' ad servers and third-party verification vendors could narrow or widen; Google offers no data on either.

Reach beyond Google's own buying platform is the third. Campaign Manager 360 counts impressions for the creatives it hosts, whichever platform bought the media, and the 2025 notice explicitly covered display ads hosted there. Advertisers buying through other demand-side platforms while trafficking creatives through Campaign Manager 360 may therefore see the ad server's count change basis even where their buying platform's does not.

The fourth is continuity. Year-on-year comparisons that span February 2027 will set a download-completion count against an execution-start count, unless the 2025 notices already moved invoices. For the many agencies that report display delivery by impressions, and for the advertisers who approve those invoices, the February 2027 date is a break in the series whose size Google has characterized with a single word.

The rest of the page

The begin-to-render entry is the only item on the page that changes the unit on which display invoices are calculated. Other dated items on the same page concern operations. Connatix becomes JWX and Seedtag becomes Seedtag NeuroX in Display & Video 360 reporting on September 21, 2026, with exchange IDs unchanged. Brand suitability controls are consolidated on October 1, 2026 into three inventory modes and 10 content themes. On October 26, 2026, remaining active and paused legacy maximum cost-per-view and Video reach 1.0 line items will be auto-archived and stop serving. That last deadline requires manual migration, according to Google. The impression counting change, by the company's account, requires nothing.

Timeline

Summary

Who: Google, through Campaign Manager 360 and Display & Video 360, and the advertisers and agencies billed for display impressions on those platforms. AdSense and Ad Manager publishers face a parallel change on the sell side.

What: Billed display impressions will be counted on a begin-to-render basis, recorded when creative assets have finished downloading to the browser, instead of on-download, recorded when the ad code began executing. Google expects a slight decrease in billed impression volume and gives no estimate. A near-identical switch was scheduled for September 2025, and the new notice does not explain the difference.

When: The change is dated February 2027, with no specific day. It appears on a Display & Video 360 Help Center page last updated on August 21, 2026. The AdSense and Ad Manager change is dated February 17, 2027.

Where: Display & Video 360 and Campaign Manager 360 display inventory, with the notice describing browser-based counting. The page does not address mobile app inventory already counted under a one-pixel rule, or counts on third-party exchanges.

Why: According to Google, the change aligns both platforms with Media Rating Council standards to support continued accreditation, and impressions counted this way are more likely to have had an opportunity to be seen. For buyers, it alters the unit on which display invoices, cost-per-thousand comparisons and contract reconciliations rest.