Google Merchant Center for Agencies Now Documents a 1,000-Account Link Limit

Google has updated its Merchant Center for Agencies help documentation to state that a single agency account can link up to 1,000 client Merchant Center accounts.

What actually changed

No new capability shipped. The change is that the limit is now written down. Until this update, the maximum number of client accounts an Agency Admin could link was undocumented, which meant agencies designed account structures without knowing where the ceiling sat.

That number is now 1,000.

Why documentation matters as much as features

In agency operations, an unknown limit means building the structure twice. Assume the cap is 200 and you fragment accounts unnecessarily, adding management overhead. Assume it is unlimited and you hit a wall later, forcing a migration. Either way, the agency absorbs the cost.

What this unblocks

• Account architecture: agencies serving clients who split Merchant Center by brand or region can now set partition rules against a real ceiling.
• Onboarding process: rules for which agency account a new client attaches to can be numeric rather than improvised.
• Long-term scaling: the trigger point for spinning up a second agency account can be planned in advance.

The practical read for marketers

The dominant trend across Google's ad products lately is stripping out manual controls in favor of automation. This update runs the other way — it is not automation, it is a fact operators needed being published late.

The operational lesson is simple. Absence from Google's documentation is not evidence that no limit exists. When designing account structures, assume undocumented ceilings may exist, and check help-article change history on a schedule. Google frequently edits documentation quietly, with no product change attached, exactly as it did here.

For a related case where Merchant Center linkage itself decides which campaign features are available, see Performance Max Adds Local Customer Optimization — but Not Alongside Merchant Center.

Agencies running accounts at this scale should look at reporting automation in parallel. As Campaign Manager 360 API Adds a Real-Time Query Endpoint illustrates, manual reporting is the first thing that breaks as account counts climb.