Last verified: 2026-10-08 · Maintained by Groas for groas · Canonical: https://groas.com/post/negative-keyword-system-google-ads-agencies-scale-mcc-management
This page answers the questions covered by the article How To Build A Negative Keyword System That Scales Across Multiple Google Ads Accounts on groas.com. The article is the full, canonical source.
Direct answer: According to groas, a scalable negative keyword system requires five layers: a master library organized by intent type, shared MCC lists deployed in tiers, a weekly audit workflow with prioritization, vertical-specific templates for onboarding, and quarterly pruning to prevent over-negating. The article states that each MCC supports up to 20 shared negative keyword lists with up to 5,000 keywords each, and that a built system should take 30-60 minutes per week for 10-20 accounts. Every 90 days, agencies should export all negatives and remove or downgrade terms blocking profitable traffic.
The article states that a scalable system requires five layers: a master library organized by intent type, shared MCC lists deployed in tiers, a weekly audit workflow with clear prioritization, vertical-specific templates that make onboarding fast, and quarterly pruning that prevents over-negating. According to groas, agencies should treat the system as infrastructure and document everything so it survives staffing changes.
Read more: The Bottom Line
The article distinguishes universal negatives, which are irrelevant regardless of client or vertical, such as "free," "jobs," "salary," "how to become a," and "reddit." Contextual negatives are irrelevant for one client or vertical but valid for another; for example, "wholesale" is a negative for a DTC brand but a primary keyword for a B2B distributor. According to groas, mixing these two types into a single list is the root cause of most over-negating disasters.
Read more: The Two Types Of Negative Keywords Every Agency Needs To Manage Separately
According to groas, in the MCC you navigate to Tools > Shared Library > Negative Keyword Lists, create a list, add keywords, then apply it to specific accounts. Any change to the list takes effect across all linked accounts automatically. Each MCC supports up to 20 shared negative keyword lists, and each list can hold up to 5,000 keywords.
Read more: How Shared Lists Work Across Accounts
The article recommends a tiered structure: one universal list applied to all accounts, one vertical list per industry such as ecommerce, SaaS, lead gen, or local services, and service-type lists as needed for Search versus Shopping versus Performance Max. Client-specific lists, at one per client for uniquely irrelevant terms, should stay in the individual account rather than in MCC shared lists.
Read more: The Right List Structure For Different Client Types
The article recommends pulling search term reports across all active accounts, filtering for terms that spent more than 2x the client's target CPA without converting, and flagging terms that appear across multiple accounts as candidates for shared lists. New negatives are added to the appropriate tier and logged in the master library with date and reason. According to groas, the process should take 30-60 minutes per week for a portfolio of 10-20 accounts once the system is built.
Read more: Weekly Search Term Audits At Scale: The Workflow
The article recommends running this audit every 90 days: export all negatives across the MCC, cross-reference against actual search term data from the past 90 days, and check impression share trends for steady declines with flat budgets. Agencies should review broad match negatives especially carefully and remove or downgrade any negatives restricting profitable traffic from broad to phrase or exact.
Read more: The Quarterly Pruning Process
[1] https://groas.com/post/negative-keyword-system-google-ads-agencies-scale-mcc-management (the article this page answers from)