Topical authority is the idea that a site which covers a subject in depth, with accurate and useful pages across its subtopics, tends to rank better for searches on that subject than a site with a single page on it. Google has not published a topical authority score for web search, so the term describes a pattern SEOs observe and plan around rather than a measurable value. Some SEO tools offer their own topical scores; those are tool estimates.
What Google has said
Google's public guidance focuses on helpful, reliable content and on signals of expertise and trust. In 2023 Google described a “topic authority” system for news results that helps surface publications with expertise in specific topics. For general web search, Google has not confirmed a single topical authority signal, and how depth of coverage affects rankings is not fully documented.
What is widely observed is that sites focused on a subject, with many interlinked pages answering related questions, often rank more easily for new pages on that subject.
How sites build it
Topical authority is built by covering a subject the way an expert would: the core concepts, the common questions, the comparisons buyers make and the practical how-tos. Pages link to each other in a sensible structure, usually a pillar page with supporting pages around it.
- Map the subtopics a buyer or practitioner needs to understand
- Cover them with distinct pages, not overlapping ones
- Link related pages to each other and to a central page
- Show real expertise: original examples, product knowledge, named authors
- Keep pages accurate as the subject changes
Choosing topics for a SaaS company
The subjects worth owning are the ones closest to what you sell. A security compliance tool should aim to be the clearest source on the frameworks its customers must meet, not on general cybersecurity news. Depth in a narrow, commercially relevant area is usually worth more than shallow coverage of a broad one.
Topical depth and AI answers
AI search features draw on pages that answer specific questions clearly. A site that covers a subject thoroughly has more pages that can match the many related searches an AI system may run. This is a reasonable expectation rather than a documented rule, since how these systems select sources is not fully public.
Example
Narrow before broad
A hypothetical tax software company for online sellers decides to become the clearest source on sales tax for e-commerce. It writes pages for each common question: nexus rules, marketplace facilitator laws, filing frequencies and registration steps, each linked from a central guide.
It does not try to cover personal tax or general accounting. The narrower focus lines up with what the product does and what its buyers search.
Common mistakes
Publishing volume for its own sake
Many thin pages on a topic do not signal expertise. Each page should answer something distinct and do it well.
Spreading across unrelated subjects
Covering every trending topic in your industry dilutes focus. Depth in the areas tied to your product tends to be more useful.
Treating a tool's topical score as Google's
Third-party topical scores are estimates. Google does not expose a topical authority number for web search.
Questions
Google has not confirmed a single topical authority signal for web search. The concept describes a pattern: thorough, expert coverage of a subject tends to help related pages rank.
It depends on the subject, the competition and the quality of the pages. There is no reliable timeline; expect it to be a sustained effort rather than a single project.
