Meta Attribution Explained: How Meta Assigns Credit, and What It Leaves Out

Meta attribution is the set of rules Meta uses to decide which of your ads gets credit for a purchase, and in 2026 those rules changed twice in three months.

If your Ads Manager ROAS moved this year and your campaigns didn’t, the rules are the reason.

This post is the plain-language reference: what each attribution setting means today, how Meta actually assigns credit, and the parts of the picture it never shows you.

How does Meta attribution work?

Meta credits a conversion to an ad when the person who converted interacted with that ad inside an attribution window, and it counts the interaction that happened last.

There is no probabilistic modeling or fractional credit in standard attribution.

It is a lookback: did this person click, engage with, or see one of your ads within the window before buying? If yes, the ad gets the conversion.

Three things decide what shows up in your ROAS column:

The interaction type. A link click, a social engagement, or a plain impression.

The window. How many days after that interaction a purchase still counts. Click windows are 1 or 7 days. Engage and view windows are 1 day.

The counting rule. “All conversions” counts every purchase a person makes inside the window. “First conversion” counts only the first one.

The default for a website conversion campaign in 2026 is 7-day click, 1-day engage-through, and 1-day view-through, with all conversions counted, per Jon Loomer’s 2026 attribution breakdown. Most accounts have never changed it. That default is where the gap between Meta’s number and your bank balance starts.

What are the three types of Meta attribution in 2026?

Meta now sorts every attributed conversion into one of three buckets, and two of the three require no click on a link.

Click-through attribution

Since March 3, 2026, click-through attribution means link clicks only. Before that date, a like, a comment, or a tap on your profile also counted as a click. Meta announced the change in its “Simplifying Ad Measurement for a Social-First World” post, and the practical effect is that click-through is now the strictest bucket Meta offers. Someone clicked the link, landed on your site, and bought within 1 or 7 days.

Engage-through attribution

Engage-through is the new bucket that absorbed everything that used to be counted as a click but wasn’t one. It credits a purchase within 1 day of a like, comment, share, save, profile visit, or a video view of 5 seconds or more, according to Dataslayer’s breakdown of the March change. It replaced the older engaged-view setting, and in the process the video threshold dropped from 10 seconds to 5. We covered what that does to short-form video ROAS in our post on the engaged-view expansion.

View-through attribution

View-through credits a purchase within 1 day of an impression. No click, no engagement, no evidence the person noticed the ad. This is the bucket that carries most of the inflation in retargeting campaigns, and it is the one Meta has been quietly narrowing: on January 12, 2026, the 7-day and 28-day view windows stopped returning data in the Ads Insights API. Only the 1-day view window survives.

What does Meta attribution leave out?

Meta attribution leaves out every touchpoint that isn’t on Meta, and it makes no attempt to reconcile with them. That single fact explains most of the disagreements between your platforms.

Other channels. If someone clicks a Meta ad on Monday, a Google Shopping ad on Wednesday, and buys on Thursday, Meta credits itself. So does Google. Meta does not deduplicate against any other platform, as TheOptimizer’s 2026 guide points out, and neither does anyone else.

Your store’s own record. Shopify uses a 30-day click-only model. Meta uses 7-day click plus 1-day engage and view. CorePPC’s analysis puts the typical Meta-over-Shopify gap at 40 to 70 percent on the same campaigns, and attributes most of it to view-through.

Proof. A view-through conversion is an assertion, not a record. Meta says the impression was served. It cannot show you the person saw it, and you cannot verify it independently.

Double counting across ad sets. Meta deduplicates within an ad set but the same conversion can appear under multiple ad sets or campaigns if the person interacted with several.

History. Because the March change redefined what a click is, your pre-March and post-March click-through numbers measure different things. Trend lines across that date are not comparable.

We’ve written before about what the click definition change means in practice. The short version: the same campaign, with no changes, would report fewer click-through conversions and more engage-through conversions after March 3. Nothing about customer behavior changed.

What about Meta’s incremental attribution model?

Incremental attribution is Meta’s opt-in alternative to the window-based model. It uses Meta’s own predictions of whether an ad caused a conversion, and when you turn it on, you lose the ability to set your own windows.

It is a reasonable idea.

It is also a model built, trained, and reported by the same company selling you the impressions, with no external audit. Use it as one more Meta-side signal, not as a replacement for independent measurement.

How to read your Meta attribution reporting without getting fooled

The fix is not to distrust Meta. It is to know which number you are looking at, and to have a second number you control.

Split your conversions by attribution type. In Ads Manager, open the Columns menu and choose Compare Attribution Settings. Add 7-day click, 1-day engage, and 1-day view as separate columns. Jon Loomer’s walkthrough covers the setup. You will see, campaign by campaign, how much of your ROAS is link clicks and how much is impressions.
Judge retargeting on click-through only. Retargeting audiences already visited your site. A 1-day view credit on someone who was going to buy anyway is where view-through inflation lives. If a retargeting campaign’s ROAS collapses when you remove view, that is information.
Stop comparing across March 3. Reset your baselines. Any “we’re down 20 percent on click conversions year over year” claim needs a footnote.
Run a second, independent set of numbers. This is the part Meta cannot do for you. First-party, click-only attribution tracks the click ID on every ad, follows the session on your own domain, and ties the order to the ad that sent it. No impressions, no engagement guesses, no platform self-reporting. When we run this next to Meta’s number on the same account, the gap is often large: on one account Meta reported 3.23x ROAS and click-only first-party measurement showed 0.93x. Click-based attribution is not perfect either. It undercounts genuine upper-funnel influence. But every conversion it reports has a click behind it that you can inspect, which is more than the view column can say.

If you want the broader picture on what Ads Manager shows and hides, our Meta ads reporting post goes deeper on the dashboard side, and this comparison of view-through and click-through covers the methodology argument in full.

Meta attribution is a set of rules, and the rules now favor engagement and impressions over verifiable clicks. Knowing the rules gets you halfway.

Having your own click-based, first-party number for the same period gets you the rest. If you want to see how your Meta-reported ROAS compares to independently measured, click-only ROAS on your own account, book a live AdBeacon demo.

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FAQ

What is Meta attribution?

Meta attribution is the rule set Meta uses to credit conversions to ads. A conversion is credited when the buyer clicked, engaged with, or viewed an ad within a set window, currently 1 or 7 days for clicks and 1 day for engagements and views.

What changed in Meta attribution in 2026?

Two things. On January 12, 2026, Meta removed the 7-day and 28-day view-through windows from its API. On March 3, 2026, it redefined click-through to mean link clicks only and moved likes, comments, shares, saves, and 5-second video views into a new engage-through category.

What is engage-through attribution on Meta?

Engage-through credits a purchase made within 1 day of a non-link interaction with an ad: a like, comment, share, save, profile visit, or a video view of at least 5 seconds. It replaced engaged-view attribution in March 2026.

Why doesn’t my Meta ROAS match Shopify?

Meta counts 7-day click plus 1-day engage and view conversions. Shopify credits the last click in a 30-day window. Meta typically reports 40 to 70 percent more revenue than Shopify on the same campaigns, mostly from view-through credit.

What is the best Meta attribution setting for ecommerce?

For evaluating spend, 7-day click gives the most defensible number inside Ads Manager. Keep the default for delivery optimization if it performs, but report on click-only and verify against a first-party attribution source you control.