Google Shopping in the UK and EU: How US Agencies Get Their Clients 20% Cheaper Clicks
If you run Google Shopping or Performance Max for clients selling into the UK or the EU, part of every bid is lost before the auction starts. This guide explains why, what it costs your clients and how to switch an account without touching its campaigns.
In the US, a $1.00 Shopping bid enters the auction in full. In Europe, Shopping ads run through a Comparison Shopping Service (CSS). If an account has not chosen one, Google Shopping acts as its CSS and keeps a margin: of a €1.00 bid, only €0.80 competes.
In short: through a certified CSS the full bid enters the auction. Your client pays 20% less per click at the same position, or bids with 25% more power at the same budget.
Europe runs Shopping ads through Comparison Shopping Services, the US does not
In 2017 the European Commission fined Google €2.42 billion for favouring its own comparison shopping service in search results. Since then, Shopping ads in Europe are placed through a CSS, and Google Shopping is one CSS among many.
The CSS advantage applies in 21 markets: Austria, Belgium, the Czech Republic, Denmark, Finland, France, Germany, Greece, Hungary, Ireland, Italy, the Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Spain, Sweden, Switzerland and the United Kingdom.
Google is extending Shopping ads to further markets: Bulgaria, Croatia, Estonia, Latvia, Lithuania, Luxembourg and Serbia from September 2026, and Slovenia from March 2027. From each launch, the CSS advantage applies there too.
The Regulatory Origin: Why Europe Is Different
Shopping ads in Europe follow different rules than in North America. Four facts explain the structure.
What the margin does to a bid
The same €1.00 bid, routed two ways. Google Shopping takes its margin before the bid reaches the auction, so an account without its own CSS competes with less.
A certified CSS puts the full bid into the auction
| Google Shopping (default) | Certified CSS | |
|---|---|---|
| Max CPC set in Google Ads | €1.00 | €1.00 |
| Amount that enters the auction | €0.80 | €1.00 |
| Bid needed for €1.00 in the auction | €1.25 | €1.00 |
| Ad quality and relevance | Same rules | Same rules |
Positions still depend on ad quality and on what competitors bid. A CSS gives the same bid more weight in the auction; it does not buy a reserved position.
Decide how your client uses the advantage
- Grow at the same budget: keep Max CPCs and Target ROAS unchanged. Each bid competes with 25% more weight, so the client can win auctions that were too expensive before.
- Pay less at the same position: lower manual Max CPCs by 20%, or raise Target ROAS step by step. The amount in the auction stays where it was, while the cost per click falls.
Use the saving to fund your client's European expansion
Selling from the US into Europe adds costs: international shipping and returns, VAT registration, translation and local customer support. Cheaper clicks do not remove these costs, but they leave more budget to cover them.
- Model it: apply 20% lower CPCs to the client's current European Shopping spend and show the result next to their logistics and VAT costs.
- Start where the money is: switch the accounts and markets with the highest Shopping spend first.
- Report it: track CPC, ROAS and revenue per country for equal periods before and after the switch.
What changes when you switch, and what stays the same
Do we have to rebuild campaigns?
No. The switch happens in Google Merchant Center, where the account is linked to the new CSS. The Google Ads account, campaigns, asset groups, audiences, conversion data and bid strategies stay as they are.
Who owns the Merchant Center account?
Your client does. The CSS link only takes effect after an administrator of the Merchant Center account approves it. Google Ads billing stays with the client; the CSS fee is billed separately.
Does it work with Performance Max?
Yes. The advantage applies to Shopping ads from Standard Shopping and Performance Max campaigns in the CSS markets listed above.
Will the ads look different?
Images, titles, prices and landing pages stay the same. The only visible change is the label under the ad: it shows the CSS name instead of "By Google".
- Free Google CSS migration
- Full visibility in Google Shopping
- 20% lower click prices
- 21 EU markets included
- Premium email support
- No minimum term
Switch a client account in four steps
- 1Check eligibility: confirm the client runs Shopping ads in CSS markets, and see in Merchant Center which CSS the account uses today.
- 2Share the Merchant Center ID: send the client's Merchant Center ID to a certified CSS partner, which requests the link.
- 3Approve the request: an administrator of the client's Merchant Center account approves the CSS link.
- 4Check and adjust: look at a live Shopping ad for the CSS name under the ad, then decide whether the client grows at the same budget or saves at the same position.
With csspartner.io, we get in touch within 24 hours of your booking. Access comes with a 30-day free trial, no setup fee and monthly cancellation. Campaign management is not included; you keep running the campaigns.
No Additional Technical Effort for Your Team
Operating your own CSS would hardly be economically viable for most agencies. Beyond the technical platform, it demands meeting Google's CSS requirements, product data infrastructure, merchant management, data protection processes, maintenance and support.
This effort is eliminated. We take care of:
The takeaway: European Shopping accounts without a CSS pay more than they need to
- 20% lower CPC at the same position, or 25% more bidding power at the same budget.
- No rebuild: campaigns, conversion data and bid strategies stay in place.
- One approval in Merchant Center per client account.
- Start with the client that spends the most on Shopping in Europe.
- Free Google CSS migration
- Full visibility in Google Shopping
- 20% lower click prices
- 21 EU markets included
- Premium email support
- No minimum term