Amazon Attribution Explained (2026 Model Changes)
If your reported sales dropped in 2026 without your ads changing, attribution is the culprit — not performance. And “attribution” on Amazon actually means two different things worth untangling.
“Amazon attribution” means two things: the attribution model — how Amazon credits a sale to an ad — and Amazon Attribution, the free tool for measuring off-Amazon marketing that drives Amazon sales. In 2026 the model changed: view-through is now machine-learning-judged, with “all views” metrics kept for comparison and a Multi-Touch Attribution beta added. Click attribution is unchanged.
01Two meanings of “attribution”
The word gets used two ways, and conflating them causes confusion. First, there’s the attribution model — the rules deciding whether a sale gets credited to an ad at all, and which ad. Second, there’s Amazon Attribution (capital A), a specific free product that measures how your off-Amazon marketing — Google, Meta, email, influencers — drives sales on Amazon. This lesson covers both, because both matter and both are easy to mix up. We’ll take the model first, since that’s what changed in 2026.
02How Amazon credits a sale
Amazon credits conversions two ways. Click-through attribution credits a sale when a shopper clicked your ad and then purchased within an attribution window — typically around 7 days for Sponsored Products and 14 days for Sponsored Brands and Sponsored Display. View-through attribution credits a sale when a shopper saw your ad without clicking and then bought within a window. View-through is generous by nature — a lot can happen between seeing an ad and buying — which is exactly why it became the focus of the 2026 change.
03The 2026 model change
On January 1, 2026, Amazon replaced its old “blind” 14-day view-through window with a shopping-signal enhanced last-touch model. Instead of crediting any purchase made within 14 days of an ad view, it now uses machine learning to judge whether the view actually influenced the purchase — favoring views that reached shoppers during genuine brand-discovery moments and applying a shorter window. Crucially, click attribution is unchanged; only view-through was affected, across Sponsored Brands, Sponsored Display (vCPM), and DSP on the Amazon store (offsite DSP keeps the traditional 14-day click / 14-day view window). The practical effect: many advertisers saw double-digit declines in attributed revenue — a measurement change, not a drop in real performance.
04“All views” & Multi-Touch Attribution
Amazon added two things to soften and enrich the shift. The “all views” metrics (e.g. Purchases (all views)) preserve the old 14-day view methodology, so you can compare 2026 against pre-2026 on a like-for-like basis — essential for honest year-over-year reporting. Separately, a Multi-Touch Attribution (MTA) beta launched around the same time, distributing credit across the whole ad journey rather than to a single last touch. Watch the gap: if your MTA ROAS is meaningfully higher than last-touch, that’s a strong signal your upper-funnel media is contributing more than last-touch reporting shows.
05The last-click blind spot
Even improved, last-touch attribution has a structural bias worth naming. It credits the final on-Amazon touch before purchase, which systematically over-credits bottom-funnel Sponsored Products (usually the last click) and under-credits the awareness and consideration work — DSP, Sponsored TV, external channels — that made the shopper want the product in the first place. Optimizing purely to last-click numbers slowly starves the top of the funnel. This is why serious measurement pairs attribution reports with incrementality analysis in Amazon Marketing Cloud.
06Amazon Attribution: the off-Amazon tool
Now the product. Amazon Attribution is a free tool (for Brand Registry brands) that measures how your off-Amazon marketing drives Amazon sales. You generate attribution tags, add them to your external links — Google and Meta ads, email, TikTok, influencer and blog links — and then see the clicks, detail-page views, add-to-carts, and purchases each external source drove on Amazon. Without it, external traffic is a black box behind Amazon’s walled garden. It’s manual to set up and imperfect, but it’s the only native way to connect off-Amazon effort to on-Amazon sales — and it’s what unlocks the Brand Referral Bonus, a credit for driving external traffic that converts.
07Attribution at a glance
| Concept | How it works | 2026 status |
|---|---|---|
| Click-through | Clicked ad → bought in window | Unchanged (SP ~7d, SB/SD ~14d) |
| View-through | Saw ad, no click → bought | New ML model (Jan 2026), shorter |
| “All views” metric | Old 14-day view method | Kept for year-over-year comparison |
| Multi-Touch (MTA) | Credit split across the journey | Beta (US) |
| Amazon Attribution | Off-Amazon traffic → Amazon sales | Free tool; unlocks Referral Bonus |
08How to use attribution well
A few principles keep you out of trouble. Know which model and window your numbers use, and after 2026 compare trends, not raw totals across the January boundary — lean on “all views” for continuity. Compare last-touch against MTA (and AMC incrementality) to see the true value of your upper-funnel media before cutting it. Set up Amazon Attribution for any external traffic you drive, and claim the Brand Referral Bonus while you’re at it. Above all, don’t over-trust last-click: it’s useful, but it consistently misprices awareness. Next, we move from historical attribution to real-time data with Marketing Stream.
- “Attribution” means both the crediting model and Amazon Attribution, the off-Amazon measurement tool.
- The Jan 2026 change made view-through ML-judged and shorter; click attribution is unchanged.
- Attributed revenue dropped for many advertisers — a measurement change; use “all views” for year-over-year.
- Last-click over-credits Sponsored Products and under-credits awareness — pair it with AMC incrementality.
- Amazon Attribution tracks external channels driving Amazon sales and unlocks the Brand Referral Bonus.
Frequently asked questions
What is Amazon Attribution?
Amazon Attribution is a free tool for Brand Registry brands that measures how off-Amazon marketing — Google, Meta, email, influencers — drives sales on Amazon. You add attribution tags to external links and see the clicks, detail-page views, and purchases each source drove. “Attribution” also refers more broadly to how Amazon credits sales to ads.
What changed with Amazon attribution in 2026?
On January 1, 2026, Amazon replaced the blind 14-day view-through window with a shopping-signal enhanced last-touch model that uses machine learning to judge whether an ad view truly influenced a purchase, with a shorter window. Click attribution was unchanged. Many advertisers saw attributed revenue fall as a result — a measurement change, not a performance one.
What is the Amazon attribution window?
It’s the period after an ad interaction within which a purchase can be credited to that ad. Click windows are typically around 7 days for Sponsored Products and 14 days for Sponsored Brands and Display. The view-through window was 14 days but is now governed by the 2026 machine-learning model with a shorter effective window.
What is view-through attribution?
It credits a sale when a shopper saw your ad without clicking and then purchased within the attribution window. Because a lot can happen between a view and a purchase, Amazon’s 2026 model now uses machine learning to judge whether the view genuinely influenced the sale rather than crediting every purchase within a fixed window.
What is the Brand Referral Bonus?
It’s an Amazon program that gives brand-registered sellers a credit for driving external, off-Amazon traffic that converts into Amazon sales. It’s tracked through Amazon Attribution tags, so setting up Amazon Attribution for your external campaigns is what makes you eligible to earn it.
Or return to Module 8: Advertising Reports or the course hub.