Google help page now says Demand Gen cost adjustments run up to 60 days, not three weeks

The Google Ads Help article "About performance-based cost adjustment for Demand Gen Target CPA and Target ROAS campaigns (Beta)" now states that the cost adjustment "remains in effect for up to 60 days", activates "no more than 5 days after your campaign has started", and covers both tCPA and tROAS campaigns. Earlier documentation, as summarised by PPC News Feed on 14 November 2025, described a tCPA-only beta that could stay active "for up to three weeks". The help page carries no date and Google has not published a dated announcement, so the exact day the wording changed is not stated by Google; the current text was read on 26 October 2026, and PPC News Feed reported the 60-day wording on 25 October 2026.

What the Google help page says today

The page describes a feature for Demand Gen campaigns using Target CPA or Target ROAS bidding that are in the learning phase. In Google's words: "we may apply a cost adjustment if it will help improve performance over time. This feature retroactively adjusts cost based on conversion data and aims to keep your actual campaign metrics closer to the target you set."

The mechanism is a downward-only correction tied to prediction error. "Costs may be adjusted downward if a campaign's conversion falls below predicted value during the learning phase." Google explains why predictions miss: "your actual conversion depends on multiple factors, like changes to your website or ads. Your actual conversion can be lower or higher than the predicted value." The feature "addresses potential variability in conversion predictions when conversion information is more limited", which is another way of describing the early days of a campaign before Smart Bidding has enough conversions to be confident.

Two timing statements define the window, and they are the news:

• "The performance-based cost adjustment for eligible Demand Gen tCPA/tROAS campaigns will be automatically activated no more than 5 days after your campaign has started."
• "The cost adjustment remains in effect for up to 60 days, or until your account or campaign reaches its designated duration or cost adjustment limit."

The second bullet carries two caveats that are easy to skip. "Up to 60 days" is a ceiling, not a promise, and the adjustment can end earlier when a campaign or account hits "its designated duration or cost adjustment limit". Google does not publish what either limit is.

What earlier documentation said

The before-state has to be handled carefully because Google's page is undated and there is no changelog. A dated description is the PPC News Feed summary from 14 November 2025, which reported that Google was "introducing a performance-based cost adjustment feature for Demand Gen Target CPA (tCPA) campaigns on YouTube" and that the feature "activates within five days of campaign launch and can remain active for up to three weeks". That summary linked to a help page then titled "About YouTube performance-based cost adjustment for Demand Gen Target CPA campaigns (Beta)".

Set against the page as it reads on 26 October 2026, three things moved: the duration ceiling, the bidding strategies covered, and the title. The 5-day activation window is the one element that matches in both descriptions. Google has not published a note explaining the change, and a reader relying only on the help page would have no way of knowing it had changed at all.

Before and after, from the two dated sources

The table lists the elements where the two descriptions differ, with the source for each.

Eligibility: what Google states and what it withholds

Google is explicit that eligibility is not automatic and not transparent. "Eligibility is based on a multitude of factors, including, for example, the authenticity of your account activity and the age of your account." It is "also limited to advertisers who consistently follow best practices for conversion tracking and bid and budgets, and these factors may be subject to change." Then the sentence that matters for anyone planning around it: "While compliance with baseline requirements is necessary for eligibility, it doesn't guarantee application of the feature."

Google adds that the adjustment "will only be applied to certain campaigns or on specific days". So within one account, two Demand Gen campaigns with identical settings can have different outcomes, and the same campaign can be adjusted on one day and not the next. The page does not define "authenticity of your account activity", does not give a minimum account age, and does not say which conversion tracking or budget practices count as best practice for this purpose. Nothing in this article should be read as adding criteria the page does not contain.

Reporting: no line items, up to 5 days of lag

The reporting section is where the demand gen cost adjustment creates practical work for anyone reconciling spend. Google states: "Your cost reporting will reflect the final cost you will be responsible for after any automatic adjustments have been applied. These adjustments can take up to 5 days to be reflected in your cost reporting after your campaign has started. There are no separate line items, credits, or notifications for these adjustments."

Put the pieces together and the operational picture is this. A Demand Gen tCPA or tROAS campaign launches. Within 5 days, if eligible, the adjustment switches on silently. For up to 60 days, cost figures for days already past can be revised downward if conversions fall short of what the system predicted. Google says adjustments "can take up to 5 days to be reflected in your cost reporting after your campaign has started". The account shows only the adjusted final cost, with no marker that an adjustment happened. An agency that exported a cost report on day 10 and invoiced from it may find the same date range reports a lower figure on day 15, with no explanation in the interface.

A 60-day ceiling always crosses at least one month-end and often two, so month-one reports for a campaign launched mid-month can still shift after month two has started.

What the help page does not say

• No change date. The page is undated and there is no revision note. Google has not said when "three weeks" became "60 days" or when tROAS was added.
• No size of adjustment. The page says costs "may be adjusted downward" but gives no range, percentage or cap, beyond the undefined "cost adjustment limit".
• No upward adjustment. Every reference is to downward correction. The page does not describe any case where cost is revised up.
• No channel breakdown. Demand Gen serves across YouTube, Discover and Gmail. The current title has dropped the word "YouTube" that the earlier title carried, but the page does not say whether the adjustment applies per channel or at campaign level.
• No opt-out or opt-in. The page describes an automatic feature. There is no setting mentioned, and no way to request it.
• No relationship to learning-phase length. The page says the adjustment supports the learning phase, but does not say whether it ends when the learning phase ends or runs to the 60-day limit regardless.

How this connects to the October Demand Gen changes

This is the third Demand Gen item Relevant Audience has covered in October 2026. The 14 October post covered Google's October Demand Gen feature drop, and the 24 October post covered seasonality adjustments for Demand Gen. The cost adjustment is different in kind: it is not a control an advertiser sets, and Google has not published a dated announcement about it. It is a documentation change to a beta that quietly extends how long Google can reach back and lower reported costs on learning-phase campaigns. For teams comparing Demand Gen CPA against a target over the first two months, the number they compare against can keep moving within the window.

What this means for Thai marketers

tCPA and tROAS are the bidding strategies the feature targets, so Thai accounts are in scope on the same undisclosed eligibility terms as everyone else. The page gives no country restriction, but it also gives no way to confirm whether a given Thai account qualifies. Practical consequences, based on the page text:

• Treat cost figures for Demand Gen tCPA/tROAS campaigns as provisional for roughly the first 60 days plus 5 days of reporting lag, rather than final at month-end.
• When reconciling client invoices against Google Ads cost, re-pull the same date range before closing the month, and again the following month for campaigns launched in the back half of a month.
• If a campaign's early CPA looks better than the auction suggests, the adjustment is one candidate explanation; the account will not flag it.
• Keep conversion tracking clean and bids and budgets in line with Google's best practices, because Google names those practices as eligibility factors, while remembering that compliance "doesn't guarantee application".
• Do not plan budgets around receiving the adjustment. It is a beta, it is selective, and Google says so.

Anyone running Demand Gen through a managed Google Ads service should ask how the reporting handles retroactive cost changes, and where conversion data feeds into Smart Bidding from a GA4 setup, the "best practices for conversion tracking" clause is the part of the page to check first.

FAQ: Demand Gen performance-based cost adjustment

How long does the Demand Gen cost adjustment stay active?

Up to 60 days, according to the current Google Ads Help page, or until the account or campaign reaches a duration or cost adjustment limit that Google does not publish. PPC News Feed's 14 November 2025 summary of earlier documentation described a ceiling of up to three weeks.

Does the cost adjustment apply to Target ROAS as well as Target CPA?

Yes, the current page title and body both cover Demand Gen Target CPA and Target ROAS campaigns. PPC News Feed's November 2025 summary described Target CPA only.

When did Google change the window from three weeks to 60 days?

Google has not stated a date. The help page is undated, there is no changelog entry, and Google has not published a dated announcement; the 60-day wording was reported by PPC News Feed on 25 October 2026 and confirmed on the live page on 26 October 2026.

Will I see the adjustment as a credit or line item in Google Ads?

No, Google states there are "no separate line items, credits, or notifications for these adjustments". Cost reporting simply shows the final adjusted figure, and adjustments can take up to 5 days to appear.

Is every Demand Gen tCPA or tROAS campaign eligible?

No, eligibility depends on factors including account authenticity and account age, and on following conversion tracking and budget best practices, and Google says meeting those requirements "doesn't guarantee application of the feature". The adjustment may also apply only to certain campaigns or on specific days.

Source: Google Ads Help, "About performance-based cost adjustment for Demand Gen Target CPA and Target ROAS campaigns (Beta)", read 26 October 2026. Earlier wording as reported by PPC News Feed on 14 November 2025.

If Demand Gen reporting in your account has been shifting after the fact and you want the reconciliation handled, the Relevant Audience Google Ads team can set up the re-pull routine alongside campaign management.