A content hub is a pillar page covering a broad topic at a high level, supported by a set of cluster articles that each address a specific sub-topic in depth, with all articles linked together. Rather than publishing disconnected blog posts, a content hub organises your content into an architecture that helps Google understand what your site is an authority on and where to send searchers.
For UK accounting firms, content hubs are the most efficient structure for building topical authority. Instead of one article on "self assessment," you build a hub: a pillar page giving a complete overview of self assessment, with ten to fifteen cluster articles covering every sub-topic. Together, they signal to Google that your site genuinely covers this subject in full, which builds the rankings that isolated posts struggle to achieve on their own.
What a content hub is and why it works
The web is made of pages, but Google thinks in topics. Its systems try to assess whether a website has genuine, deep expertise in a subject area, not just a single well-written page on it. A site with one article on "sole trader tax" signals less expertise than a site with twelve interlinked articles covering every aspect of sole trader tax, from registration to expenses to self assessment to National Insurance to bookkeeping software.
Content clusters signal topical authority through two mechanisms. First, breadth: covering all the sub-topics within a subject shows Google that you have addressed the topic comprehensively. Second, depth: each individual article covering its sub-topic thoroughly signals that the coverage is genuine rather than superficial. The internal links connecting these articles are the third element: they tell Google how the pieces relate to each other and reinforce the cluster's coherence.
The practical result is that once a hub builds sufficient authority, its individual cluster articles tend to rank more easily because they inherit some of the pillar page's authority, and the pillar page ranks for broader terms because it is supported by a network of authoritative sub-topic articles.
Example accounting content hub structure
Consider a self assessment hub as a concrete example.
Pillar page: "Self Assessment Tax Returns: A Complete Guide for UK Taxpayers"
This page covers self assessment at a high level: what it is, who needs to file, the key dates, the process in overview, and what happens if you miss the deadline. It should be comprehensive but not exhaustive on any single sub-topic, because each sub-topic gets its own cluster article. The pillar page links out to all cluster articles.
Cluster articles (each linking back to the pillar):
- Who needs to file a self assessment return?
- How to register for self assessment with HMRC
- Self assessment for the newly self-employed
- What expenses can a sole trader include on their return?
- How to claim the marriage allowance on self assessment
- Self assessment for landlords with rental income
- What is payments on account?
- How to appeal a self assessment penalty
- Self assessment for directors of limited companies
- How to reduce your self assessment tax bill legally
- Common self assessment mistakes and how to avoid them
- Paper vs online: which filing method should you use?
Each of these cluster articles is a standalone, fully optimised post targeting its own specific keyword. Each one links back to the pillar page and to other relevant cluster articles. The pillar page links out to all twelve.
How to build a content hub: step by step
Step 1: Choose your pillar topic
Pick a topic that meets three criteria. First, it should correspond to a core service area your firm actually offers: building authority on a topic you do not convert into services is wasted effort. Second, it should have sufficient search demand to make the investment worthwhile. Third, it should be broad enough to support at least eight cluster articles without the sub-topics becoming redundant or too niche to attract their own search traffic.
Good pillar topics for accounting firms include: self assessment tax returns, VAT for small businesses, running a limited company, sole trader tax and expenses, payroll for small employers, IR35 and contracting, Making Tax Digital, and finding an accountant.
Step 2: Identify eight to fifteen supporting sub-topics via keyword research
Use Google Search Console, Ahrefs, or Semrush to find the specific questions people search within your pillar topic. For a "VAT for small businesses" pillar, supporting sub-topics might include: VAT registration threshold, how to register for VAT, VAT flat rate scheme, how to complete a VAT return, reverse charge VAT, voluntary VAT registration, common VAT mistakes, and VAT on property.
Look for sub-topics with at least 50 to 100 monthly searches in the UK. If a sub-topic has very low search volume, it may not be worth a dedicated article. In that case, address it within the pillar page instead.
Step 3: Write the pillar page first
The pillar page should be your most comprehensive piece of content on the topic: typically 2,000 to 3,000 words, covering the subject in overview with sections that introduce each sub-topic. It should leave the reader with a clear understanding of the subject and clear links to go deeper on any specific area.
Write the pillar page before the cluster articles because it defines the structure of the hub. Once you know what the pillar covers, the cluster articles fill the gaps with depth.
Step 4: Write each cluster article
Each cluster article targets its own specific keyword and covers that sub-topic thoroughly. Length depends on the complexity of the topic: simpler topics may need 800 to 1,000 words; complex topics like IR35 status determination may need 2,000 or more.
Every cluster article should include a prominent link back to the pillar page with descriptive anchor text. For example, an article on "VAT flat rate scheme" should link back to the pillar with text like "for a full overview of VAT for small businesses, see our complete VAT guide."
Step 5: Link the pillar page to all cluster articles
Update the pillar page to include direct links to each cluster article. If you wrote the pillar page before all the cluster articles existed, add links as you publish each new cluster article.
Step 6: Link relevant cluster articles to each other
Where two cluster articles cover related topics, link between them directly. An article on "how to complete a VAT return" should link to "common VAT mistakes," which should link to "how to appeal a VAT penalty." These cross-links strengthen the cluster's internal link structure and help Google understand the relationships between the articles.
How long to see results
Expect four to six months before a new content hub gains meaningful authority and rankings. This is not unique to content hubs: it reflects how long Google typically takes to assess new content and assign stable rankings.
The process tends to look like this: in months one to two, pages are indexed and may appear for very specific long-tail queries. In months two to four, rankings begin to emerge as Google assesses the cluster's completeness and internal linking. In months four to eight, the hub typically reaches its stable performance level, with cluster articles ranking for their target keywords and the pillar page ranking for the broader topic.
Hubs that are published with strong existing domain authority will rank faster. New sites or sites with limited backlinks may take longer.
Common mistakes that undermine content hubs
Insufficient internal linking: A hub without proper internal links is not a hub. It is a collection of unconnected pages. Every cluster article must link to the pillar. The pillar must link to every cluster article. Relevant cluster articles must link to each other. If the links are not there, the architecture does not work.
Cluster articles that are too thin: If cluster articles are 400-word summaries rather than comprehensive guides to their sub-topic, they will not rank and will not add meaningful authority to the hub. Each cluster article should be a genuinely useful resource on its own, not a teaser that sends readers elsewhere.
Pillar pages that go too deep: The pillar page should introduce and signpost, not exhaust every sub-topic. If the pillar page covers everything comprehensively, there is no reason to publish cluster articles, and the hub architecture collapses into a single long page that targets too many keywords at once.
Building hubs on topics that do not match your services: A hub on "how to start a brewery" may generate traffic, but if your accounting firm does not specialise in hospitality clients, that traffic will not convert. Build hubs on topics that attract the clients you want to serve.
Key takeaways
- A content hub is a pillar page covering a broad topic, supported by eight to fifteen cluster articles each covering a specific sub-topic, all interlinked.
- Hubs build topical authority faster than random blog posting because they signal to Google that your site covers a subject comprehensively and in depth.
- Choose pillar topics that correspond to your firm's core service areas: authority on topics you do not serve has no commercial value.
- Write the pillar page first, then build out cluster articles, ensuring every article links back to the pillar and that the pillar links to all cluster articles.
- Expect four to six months before a new hub reaches stable rankings; maintain consistent internal linking throughout.
- The most common hub failures are thin cluster articles, insufficient internal linking, and building hubs around topics that do not attract your target clients.
Frequently asked questions
How many cluster articles does a hub need to work?
Eight is typically the minimum to signal genuine topic breadth. A hub with four or five articles may help some rankings but will not produce the same topical authority signal as one with twelve to fifteen well-linked articles. For competitive topics, more is better.
Can we turn existing blog posts into a hub?
Yes, and this is often the most efficient approach. Audit your existing content to identify posts that cluster naturally around a common topic. Identify gaps in the cluster. Write a pillar page that connects the existing posts. Add the missing cluster articles. Update internal links. This approach builds a hub from existing content rather than starting from scratch.
Should the pillar page be on a different URL structure than the cluster articles?
The URL structure can reflect the hub hierarchy. For example, the pillar could be at /sole-trader-tax/ and cluster articles at /sole-trader-tax/expenses/, /sole-trader-tax/self-assessment/, and so on. This structure reinforces the relationship between pages for both users and search engines. However, flat URL structures work too: the internal linking is more important than the URL hierarchy.
How do we decide which hub to build first?
Build your first hub around the topic where you have the most at stake commercially, the most existing content to leverage, and the least competitive search landscape. For many accounting firms, this is their primary client type: if you specialise in sole traders, a sole trader tax hub is the obvious first investment.
What happens to hub rankings if we stop adding content?
Existing rankings tend to hold if the published content remains accurate and the internal linking is maintained. However, competitors who continue adding cluster articles in the same topic area will eventually build more comprehensive coverage. Treating a hub as a finished project rather than an evolving structure is the most common reason hubs lose competitive ground over time.
Read the AccountingStack SEO for accountants guide for a comprehensive guide to building an SEO strategy for your accounting firm, covering keyword research, content structure, technical SEO, and performance measurement.