You check a Sponsored Products report, see a sale credited to a keyword, and shift budget toward it. The report only shows what Amazon chose to attribute, though, and the rules behind that choice are stranger than most sellers expect.
The amazon sales attribution model decides which ad earns credit for a sale, and for how long after the click. Read it wrong and you will scale the wrong campaigns and misjudge your ACoS.
In the accounts we manage, attribution quirks explain a real share of confusing reports, from sales that post days late to credit landing on a product you never advertised.
Here is how the model works, how the windows differ by ad type and account, and what all of it means for the numbers you actually act on.
TL;DR — the short version
How does the Amazon sales attribution model work? Amazon uses last-touch attribution, so the final ad a shopper clicks before buying earns the sale, and clicks outrank views. Each ad type carries its own window: Sponsored Products credits a purchase within 7 days for sellers and 14 days for vendors, while Sponsored Brands, Sponsored Display, and Amazon DSP use 14 days. Brand halo can hand credit to other products in your brand, so read your ACoS and TACoS with the window and the halo in mind rather than at face value.
What the Amazon Sales Attribution Model Is
Attribution is the set of rules Amazon uses to decide which ad, if any, earns credit for a sale, and inside what time frame. Get those rules straight and your reports start to make sense; miss them and you chase ghosts.
The default is last-touch attribution. A shopper might click three of your ads before buying, yet only the final ad clicked earns the sale, and Amazon prioritizes a click over a view because a click is the stronger signal. That single rule shapes every report you read, so it is worth holding in mind before you judge any campaign.
How Attribution Windows Work by Ad Type
An attribution window is the length of time after an ad interaction during which Amazon still credits a purchase to that ad. A sale outside the window simply does not show up against your ad, even when your ad started the journey. The window is not the same across ad types or account types, which is where most confusion begins.
| Ad type | Attribution window | Model and notes |
|---|---|---|
| Sponsored Products (seller) | 7-day click | Last-touch, clicks only, merchant-based halo |
| Sponsored Products (vendor) | 14-day click | Last-touch, clicks only, brand-based |
| Sponsored Brands | 14-day click | Last-touch, brand halo included |
| Sponsored Display | 14-day | Click, or view on vCPM billing, brand halo |
| Amazon DSP | 14-day | Click and view attribution, last-touch |
Sponsored Products
Sponsored Products runs on a 7-day click window for Seller Central accounts and a 14-day window for Vendor Central. There is no view-through here, so only clicks count. Seller campaigns are merchant-based, meaning a click can attribute other products in your catalog, while vendor campaigns are brand-based, so read the purchased-product report to see the difference and understand how it sits next to Sponsored Brands.
Sponsored Brands
Sponsored Brands uses a 14-day click window for both sellers and vendors. The credit includes brand halo, so a click on one advertised ASIN can attribute sales of other products in your brand, even when a different seller shipped them. That wider net is useful for brand building, and it also inflates attributed sales if you read the number without context.
Sponsored Display
Sponsored Display carries a 14-day window and gives you a choice of model. You can run it as a standard click-based campaign, or switch to a view-based vCPM model that credits conversions after a shopper sees the ad without clicking. Brand halo applies, though a Views campaign will not include brand products sold by third-party sellers.
Amazon DSP
Amazon DSP runs programmatic display and video with a 14-day window and full view attribution. Last-touch still governs, so a DSP view or click competes with your Sponsored ads for the same conversion, and the most relevant last interaction wins. DSP leans on views, so its reported numbers move more than click-only formats whenever Amazon adjusts its view methodology.
Why Seller and Vendor Accounts Attribute Differently
The Sponsored Products gap between 7 and 14 days trips up more sellers than any other part of the model. A third-party seller running the same campaign as a first-party vendor sees fewer attributed sales, purely because the window is half as long. For a considered purchase where a shopper takes a week to decide, a meaningful share of real conversions can fall outside that 7-day view and never reach your report.
The halo differs too. Seller Sponsored Products is merchant-based, so it can credit any of your products, while vendor and Sponsored Brands campaigns are brand-based and credit only that brand. Knowing which you are reading keeps you from comparing two numbers that were never built the same way.
How Brand Halo Changes Your Numbers
Brand halo means a click on one ASIN can attribute the sale of a different ASIN in your brand. The effect is helpful when a customer discovers you through an ad and buys a related product, and it is misleading when you read the total as if every sale came from the advertised item.
The trap shows up when you sell a brand you do not fully own, such as a licensed line or a bundle. Under Sponsored Brands, Sponsored Display, or vendor Sponsored Products, sales of other products in that brand, even ones you do not stock, can land against your ad and distort your ACoS. Read the halo for what it is before you decide a campaign is a runaway winner.
Click Attribution Versus View Attribution
Click attribution is the simple case: a shopper clicks, buys inside the window, and the sale counts. View attribution counts a conversion after a shopper sees an ad without clicking, and Amazon enables it only for DSP, Streaming TV, and Sponsored Brands or Display on vCPM billing.
Since last-touch prioritizes clicks over views, a view only earns credit when no qualifying click exists. Amazon has also made its view methodology more conservative over time, so lean on click-based metrics as your steady signal and treat view-heavy numbers as the softer read.
What the Attribution Model Means for Your Reports
Once you know the rules, the odd reports start to explain themselves. A few implications matter more than the rest:
- ●Sales post late: a click today can attribute a purchase days later, so a fresh campaign looks weaker than it is until the window fills in.
- ●Last-touch undercredits discovery: the upper-funnel ad that started the journey earns nothing, so weigh incremental profit rather than trusting last-click alone.
- ●Halo sales hide in plain sight: the purchased-product report shows non-advertised ASINs credited to your ads, which is worth a regular check.
- ●Windows shape your ratios: a 7-day Sponsored Products window understates a considered purchase, so read ROAS and ACoS with the window in view.
The safe habit is to judge the account on total advertising cost of sale and total profitability, rather than one attributed-ACoS figure. Attribution tells you which ad Amazon credited, and profit tells you whether the spend was worth it.
The Amazon Attribution Model Against the Amazon Attribution Tool
The two names cause real confusion, so keep them apart. The attribution model above governs how Amazon credits sales among its own on-Amazon ad types.
Amazon Attribution, by contrast, is a separate measurement tool for external channels such as Google, Meta, and email. Enrolled brands use it to see how off-Amazon traffic drives Amazon sales, on a fixed 14-day last-touch basis, which is a different question from how your Sponsored ads share credit.
Frequently Asked Questions (FAQs)
Conclusion
The amazon sales attribution model is quieter than bidding or keyword work, yet it decides what every report tells you. Last-touch credit, windows that shift between 7 and 14 days, and brand halo all shape the sales you see, and reading them at face value leads to the wrong moves.
Hold the window and the halo in mind, lean on clicks over views, and judge the account on profit rather than one attributed ratio. Do that and your reports become a map instead of a maze.
If you would rather have a team read the attribution correctly and act on it, that is what we do. Get a free audit and we will show you what your reports are really saying.
Isaac Gross is the founder and CEO of IG PPC, a hands-on Amazon and Walmart PPC agency for 7 to 9 figure brands. An Amazon seller since 2015, he founded IG PPC in 2019 and the firm now manages billions in annual Amazon sales.
