Internal Linking: The Most Underrated SEO Tactic
Internal links pass authority between your own pages, tell Google which content matters most, and are entirely within your control — making them one of the highest-ROI SEO tactics most sites underuse.
Most SEO conversations focus on external links — backlinks from other websites that signal authority to Google. But internal links — the links you place between pages on your own site — are equally important and far more within your control. Every page you publish is an opportunity to pass authority, topical context, and crawl signals to the pages you most want to rank. Most sites do this haphazardly and leave significant ranking potential unrealised.
Google uses internal links for two distinct purposes: to understand the relative importance of pages within your site (more internal links pointing at a page signals it's more important) and to understand topical relationships (an internal link with the anchor text "email marketing for e-commerce" passes topic context, not just authority). Strategic internal linking is essentially how you give Google your own map of what's most important on your site and how the topics connect.
How do internal links pass authority between pages?
Internal links transfer PageRank — Google's core authority metric — from the linking page to the target page. A page with many high-authority external backlinks linking to it is an authority source. Every internal link from that page to another page transfers a fraction of its authority to the target. This is why your homepage and your highest-traffic blog posts are valuable internal link sources — they've accumulated authority, and the pages they link to inherit some of it.
Each internal link from a high-authority page passes a fraction of that page's PageRank to the destination.
Pages with more internal links pointing at them receive more accumulated authority from across the site.
The more links on a linking page, the smaller the fraction each individual link passes (PageRank is divided among all links on a page).
Internal links from pages deep in your site architecture pass less authority than links from pages close to the homepage, because deep pages already have lower inherited authority.
What is anchor text and why does it matter for internal links?
Anchor text is the clickable text of a link. For internal links, anchor text is a direct topical signal to Google — it tells Google what the target page is about from the perspective of the linking page. Linking to your service page with the anchor text "SEO services for small businesses" is a more useful topical signal than "click here" or "learn more." Use descriptive, keyword-rich anchor text for internal links wherever it reads naturally in context.
Use descriptive anchor text that contains the primary keyword of the target page where it fits naturally.
Vary anchor text slightly across multiple links to the same page to avoid over-optimisation signals.
Never use generic anchors ("click here," "read more," "this page") for important internal links — they waste the topical signal opportunity.
Don't over-optimise by making every link exact-match keyword anchor text — write for readability first and use the keyword naturally.
Your internal links are a private editorial layer that only you control. Used well, they're a ranking advantage competitors can't copy without knowing your architecture and intent.
Which pages should receive the most internal links?
Pages you most want to rank should receive the most internal links. For most businesses, this means your commercial pages — service pages, product pages, pricing pages — should be the most internally-linked pages on your site. Blog posts and informational content exist partly to earn external links and partly to pass authority internally to your commercial pages. This is the "hub and spoke" model: blog content (spokes) passes authority back to service pages (hubs) through internal links.
Commercial / service pages: should be linked from every relevant blog post, from the homepage navigation, and from every related page on the site.
Pillar content pages: comprehensive guides that anchor a topic cluster should be linked from every piece of supporting content in that cluster.
Newly published pages: link to them immediately from two or three established pages to get them into Google's crawl queue quickly.
Underperforming pages: if a page ranks in positions 5-15 for a target keyword, adding several high-authority internal links to it is often the fastest way to push it into the top five.
How do you audit your current internal linking?
Crawl your site with Screaming Frog SEO Spider or Ahrefs Site Audit. Look for two reports: inlinks (how many internal links each page receives) and orphaned pages (pages with zero internal links). Your most important commercial pages should be near the top of the inlinks count. Any page with zero internal links is invisible to Google's authority flow — fix these first. Also look for "link depth" — the number of clicks from the homepage to each page. Pages deeper than three clicks are under-invested in; add internal links from shallower pages to bring them closer to the surface. This connects to site architecture, which determines the channels through which internal link authority flows.
How many internal links per page is too many?
There is no hard limit, but every link on a page dilutes the authority fraction passed by each individual link. A page with 100 links passes less authority per link than a page with 10 links. In practice, editorial internal links — links naturally embedded in body content rather than in site-wide navigation — are the most valuable. Keep navigation links as lean as possible. For body content, link wherever it serves the reader and provides topical context; don't manufacture links that read unnaturally.
Should you link from old content to new content or only the reverse?
Both directions matter. Linking from new content to old content is natural — you're referencing what you've already covered. But going back to update old, high-authority posts to link forward to new content is an active internal linking strategy that most sites neglect. When you publish a new article, spend 10 minutes identifying three to five older posts where a contextual link to the new article would add value and add those links. The new page immediately inherits authority from your established content rather than starting with zero.
Do internal links affect how fast new pages get indexed?
Yes, directly. Google's crawler discovers new pages primarily through links. A new page linked from an already-indexed, frequently crawled page will typically be discovered and indexed within days. A new page with no internal links pointing to it may not be crawled for weeks, even if it's in your sitemap. The fastest way to get a new page indexed is to link to it immediately from an established page that Google crawls frequently — typically your homepage or a popular blog post.
Keep reading
Internal linking is part of a broader technical picture — the technical SEO checklist includes a linking audit among its 15 fixes. For the architecture context, site architecture and URL structure shows how the hierarchy determines where authority accumulates naturally. And for the timeline question, how long SEO takes includes internal link improvements as some of the faster-acting changes.
Sources
- Google Search Central — internal links documentation and PageRank distribution. developers.google.com/search
- Ahrefs — internal linking study: how link depth affects rankings and crawl frequency. ahrefs.com/blog
- Moz — internal link building guide and anchor text best practices. moz.com/learn/seo
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