Every private label seller eventually asks the same question: should some of my advertising budget go to Google instead of staying inside Amazon? It is a fair question — Google Shopping puts your product in front of people who have not already decided to buy on Amazon, and on paper that looks like untapped demand. In practice, the two platforms are not interchangeable, and sellers who move budget from one to the other without understanding why usually end up worse off.
We run Amazon PPC accounts for a living, not Google Ads accounts, so this is not a pitch for one platform over the other. It is a breakdown of what each one is actually good at, where the numbers mislead people, and the handful of situations where running both makes sense.
The short version: Amazon Sponsored Products sells to people who have already decided to buy something like your product today. Google Shopping reaches people earlier in the decision, some of whom end up buying on Amazon anyway — which makes Google spend genuinely hard to attribute to Amazon sales.
They Are Solving Different Problems
The biggest mistake sellers make is treating this as a single budget decision, as if Amazon PPC and Google Shopping compete for the same customer at the same moment. They rarely do.
Amazon Sponsored Products
Shown to shoppers already on Amazon, already searching a specific product term, already holding a payment method and a Prime delivery promise. The intent is high and the path to purchase is one click. You are winning a sale, not creating awareness.
Google Shopping Ads
Shown to people searching Google — some ready to buy right now, many still comparing brands, reading reviews, or researching a category. The intent spread is much wider, and a meaningful share of clicks land on your own site or a marketplace, not necessarily your Amazon listing.
If your product category has strong "I need this today" search behaviour — replacement parts, consumables, gifts close to an occasion — Amazon PPC captures that demand efficiently because the buyer is already there. If your category needs explaining, comparing, or trust-building before a purchase, Google (and content around it) can do work that Amazon's search results page cannot.
Cost Structure: Why the Numbers Are Not Directly Comparable
Sellers often compare Amazon ACOS to Google Shopping ROAS as if they are the same metric measured on two platforms. They are not, for a few structural reasons:
- Amazon bids compete only against other Amazon advertisers for a shopper who is already inside Amazon's ecosystem and typically converts at a high rate because of one-click checkout and Prime trust.
- Google Shopping bids compete across every retailer stocking a similar product, including other marketplaces, direct brand sites, and price comparison sites — often with lower conversion rates because the shopper has more friction and more choice before completing checkout.
- Amazon absorbs fulfilment, returns, and customer service cost into its referral and FBA fees, which are already baked into your Amazon margin calculation. Google traffic that lands on your own site adds payment processing, fulfilment, and customer service costs you may not be set up to absorb profitably at low volume.
- Attribution windows differ. Amazon Attribution and Amazon Marketing Cloud can show you when Google traffic converts on your Amazon listing, but a large share of assisted conversions still get under-credited because the shopper searches again directly on Amazon days later and the sale shows up as organic, not as a Google-driven conversion.
Do not judge Google Shopping spend by last-click ACOS on Amazon alone. If you run Google traffic to your Amazon listing, set up Amazon Attribution tagging before you spend a pound, or you will be flying blind on whether it actually worked.
When Amazon Sponsored Products Is the Better Use of Budget
You are FBA and most of your margin assumes Prime delivery
If your pricing and positioning lean on next-day Prime delivery, Amazon traffic converts that promise directly. Google traffic that lands off-Amazon loses it.
Your category is dominated by in-Amazon search behaviour
Commodities, replenishables, and well-known product types are usually searched directly on Amazon by buyers who skip Google entirely. Sponsored Products meets them exactly where they already are.
You need predictable, short-cycle budget efficiency
Amazon PPC budgets can be managed daily against ACOS, TACoS, and search term data within the same ecosystem you sell in — no cross-platform attribution guesswork required to make a bidding decision.
When Google Shopping Earns Its Place
You are launching a new brand with no Amazon review history
Amazon shoppers lean heavily on review count and rating before they click an ad. Early on, Sponsored Products can be expensive to run profitably. Google Shopping can build brand awareness and off-Amazon sales while you build up reviews, then you shift budget back to Amazon PPC once social proof exists.
Your category needs education before purchase
Higher-consideration products — where buyers compare specifications, read independent reviews, or need convincing of a new category — benefit from the research-stage visibility Google provides, something a sponsored listing on an Amazon search page cannot do on its own.
You sell direct-to-consumer alongside Amazon
If you have your own site and want to grow a channel that is not dependent on Amazon's fee structure and policy risk, Google Shopping to your own store is a genuinely different growth lever, not a substitute for Amazon PPC.
Running Both: What Actually Works
For established private label sellers who want to test Google Shopping without cannibalising Amazon performance, the sequencing matters more than the split:
- Get your Amazon PPC foundation right first. If your campaign structure, negative keywords, and bidding are not already efficient on Amazon, fix that before diverting budget elsewhere — it is a higher-intent, lower-risk channel and should be the base of your spend.
- Point Google Shopping at your Amazon listing via Attribution links rather than guessing, so every click is tagged and every resulting sale is traceable back to the campaign.
- Treat the first 4–6 weeks as a measurement period, not a performance judgement. Google-driven Amazon conversions take longer to show up in the data than Amazon-native PPC clicks.
- Compare blended CAC, not platform-native metrics. Work out total spend against total resulting sales (direct and attributed) rather than comparing Amazon ACOS to a Google ROAS number that is measuring a different kind of click.
- Reassess quarterly, not weekly. Cross-channel halo effects build slowly. Pulling Google spend after two underwhelming weeks usually kills a channel before it has had time to prove itself either way.
A practical rule of thumb: if your Amazon TACoS is still high and your organic rank is weak, fix that with Amazon PPC before adding Google Shopping into the mix. Google traffic sent to a listing with poor conversion rate or thin reviews will underperform regardless of how well the Google campaign itself is built.
Common Mistakes Sellers Make
- Moving budget from Amazon PPC to Google mid-quarter because Amazon ACOS looked high that week, without checking whether the Amazon spend was still profitable at the TACoS level.
- Sending Google traffic to an unoptimised listing — weak images, thin bullet points, few reviews — and blaming the ad platform when the real problem is the destination page.
- Ignoring the Buy Box and fulfilment badge on the Amazon listing a Google ad lands on. If you are not consistently winning the Buy Box, Google spend driving traffic to that ASIN is partly funding a competitor's sale.
- Running both channels without separate tracking, then being unable to tell which platform actually drove incremental revenue versus which one simply took credit for a sale that would have happened anyway.
Not sure where your Amazon PPC budget is leaking?
Before adding another advertising channel, make sure the one you are already running is working as hard as it should. StoreStride runs a free audit across your Sponsored Products, Sponsored Brands, and Sponsored Display accounts to show you exactly where budget is being wasted.
Get Free Amazon PPC Audit →Common Questions
Will Google Shopping hurt my Amazon organic rank?
Not directly. Amazon's ranking algorithm weighs sales velocity, conversion rate, and relevance on Amazon — it does not penalise you for running ads elsewhere. If Google traffic converts well on your listing, it can indirectly help rank by adding sales velocity; if it converts poorly, it adds no benefit either way.
Do I need Brand Registry to run Google Shopping ads to my Amazon listing?
No, Brand Registry is an Amazon programme and is not required to run Google Ads. It is, however, worth having regardless, since it unlocks A+ Content and brand protection tools that improve how your listing converts once the Google traffic arrives.
Should a brand-new seller with no budget history start with Amazon or Google?
Amazon, in almost every case. It is the lower-risk, higher-intent channel with a faster feedback loop, and most new private label sellers do not yet have the review count or conversion rate to make off-Amazon traffic profitable. Prove the product on Amazon PPC first, then consider Google once the listing itself is converting well.
How much budget split is typical for sellers who run both?
There is no fixed rule, but most established private label sellers we see running both keep the clear majority of spend — often 80% or more — in Amazon PPC, with Google Shopping used as a smaller, measured test rather than an equal partner in the budget.