Google counts three assists where Microsoft counts one

The common belief is that an assisted conversion is a second, smaller kind of conversion: the sales a channel helped with, to add to the sales it closed.

It is not a sale at all, and two of the biggest ad platforms do not even count it in the same unit. On one four-click path that ends in one sale, Google Ads reports three assists, Microsoft Advertising reports one, and GA4 under last click reports none. None of them is broken. Each counts something different and calls it an assist.

What each tool counts as an assist

Read from each vendor’s own documentation on 12 November 2026. Every cell is in facts above with its source.

Tool	One assist is	Qualifying interactions	Adds up to conversions?
Google Ads	One ad interaction on the path that was not the last one	Clicks and YouTube engaged views, Google’s networks only	No. Google says to expect more assists than conversions
Microsoft Advertising	One conversion, credited to another ad, that this ad was clicked before	Clicks inside the goal’s conversion period, same account	No. Each assisting ad counts the same sale once
GA4	No count. A share of credit for the early and mid part of the path	Site visits, impressions, engaged views, emails and more, up to 20 touchpoints	Yes. The credit sums to the key events

Google counts interactions. Microsoft counts conversions. Google’s own page gives the example: on the path YouTube > Search > YouTube > YouTube, YouTube gets two “click and view assists”, for the first and third interactions, and the last click conversion for the fourth. Microsoft’s definition counts “the number of conversions from other ads” that this ad was clicked before. An ad clicked three times before someone else’s sale earns three assists in Google’s unit and one in Microsoft’s.

An ad cannot assist itself in Microsoft. The assist goes only to ads clicked before “the most recently clicked ad that was credited with the conversion”. The ad that closed the sale gets the conversion, and its own earlier clicks earn nothing. In Google, the same ad’s earlier clicks are assists.

GA4 has no assist count. Its attribution paths report splits each path into early, mid and late touchpoints and shows how much credit each part gets under the model you pick. Under paid and organic last click, the early and mid parts get zero, every time, by definition. Switch to data-driven and they get a share. Either way the shares add up to the key events, which is the one way GA4’s version is safer.

One path, three answers

Take Google’s example path and run it through each documented rule. One buyer, four ad clicks, one sale.

	Google Ads	Microsoft Advertising	GA4, paid and organic last click
Path	YouTube > Search > YouTube > YouTube	Ad X > Ad Y > Ad X > Ad X	4 touchpoints: 1 early, 2 mid, 1 late
Gets the conversion	YouTube, last click	Ad X, most recently clicked	The late touchpoint, 100% of the credit
Assists	YouTube 2, Search 1	Ad Y 1, Ad X 0	Early 0, mid 0
Total for one sale	1 conversion + 3 assists	1 conversion + 1 assist	1 key event, 0 extra

Search’s one assist is Google’s rule applied, not a line from the page: Search was on the path and was not the last interaction. The rest is quoted.

Now put a cost on it. Microsoft divides spend by assists to give a cost per assist. An ad clicked twice before another ad’s sale has one assist in Microsoft’s unit and two in Google’s, so the same spend gives half the cost per assist in Google’s unit, with no change in what the ad did. A cost per assist from one platform and a cost per assist from the other are two different divisions.

What the assisted report leaves out

The Google Ads assisted conversions report is one of its attribution reports, and those are not the Campaigns page. Three gaps change the totals, and Google states all three on the same page.

• It leaves out whole networks. Search partners, Gmail, Google Maps and App campaigns count on the Campaigns page and not in the attribution reports.
• It drops late offline uploads. The attribution reports only process conversions from the last 7 days. A CRM sale uploaded on day 8 counts in the Conversions column and in Smart Bidding, and never shows in the assisted report.
• It dates the sale differently. The attribution reports date a conversion when it happened. The Campaigns page dates it by the ad query before the click. A sale on Monday from a click two weeks earlier lands in different weeks in the two places.

The striking one is the offline gate. A business that uploads qualified leads from its CRM weekly loses the part of every upload that is more than 7 days old from the path reports, and the slower the upload, the more it loses. That is exactly the business that most wants to know what assisted.

Every tool also only sees its own interactions. Google says the interactions-to-conversion view “only reflects the keywords and ads in your Google Ads account”. Microsoft limits assists to ads in the same account. Neither knows about the other, so a buyer who clicked a Microsoft ad and then a Google ad gives each platform a path with only its own clicks in it.

What AI changed here

The assist reports count converting paths only. They cannot tell an ad that moved a buyer from one that was simply there, because they never look at the paths that did not convert. GA4’s data-driven model is the machine-learning answer to that: Google says it evaluates “both converting and non-converting paths” and uses a counterfactual approach to decide which touchpoints most likely drove the key event. That is a real difference in method from counting. It is still a model of your tagged journeys, and it can reattribute a conversion for up to 7 days.

AI assistants add a path the ad platforms cannot see. A visit from a chatbot is a site-visit touchpoint in GA4, and GA4 files it as AI traffic only when it arrives untagged. In Google Ads and Microsoft Advertising it is not an ad interaction, so it is never an assist and never on the path. A buyer who asks an assistant, clicks its link, then clicks a branded search ad shows up in Google Ads as one last click with no assists.

What to do differently

1. Never add assists to conversions, and never add one platform’s assists to another’s. Google’s are interactions and Microsoft’s are conversions. Neither total is a number of sales. The last-click column and the assist column describe the same sales.
2. Compare channels inside one tool, with one rule. If you want early-path credit across platforms, use GA4’s paths report, where the credit sums to the key events, and say which model you used.
3. Upload offline conversions within 7 days if you read Google’s attribution reports. Later uploads still count for bidding and stay invisible on the path.

An assist says an ad was on the path to a sale. It does not say the sale needed the ad. Measuring that means taking the ad away from some buyers and counting what changes. How often does that kind of test get it wrong?