Do Links in Substack Notes Help or Hurt Reach?

Published: September 2026

The short answer: links hurt reach, measurably and consistently, and the size of the penalty is bigger than most writers assume. But "links hurt reach" isn't the same as "never use links" - the real question is when the tradeoff is still worth paying, and how to place a link so it costs you as little as possible when you do.

The size of the penalty, with real numbers

An analysis of 655,056 Notes found that Notes without a link had a median of 4 likes, while Notes with a link had a median of just 2 - a 44% drop, with the average falling from 19.4 likes to 10.7. This isn't a marginal effect or a small-sample fluke; it's a large, consistent gap across a dataset big enough to smooth out noise from any individual writer's audience or niche. The description that's stuck for this is a "link tax" - a flat cost charged on a Note simply for containing a URL, regardless of whether anyone actually clicks it.

It doesn't matter where the link points

A specific and somewhat counterintuitive finding: external links and links back to your own Substack publication show almost the same reach penalty - 3.64 average likes for external links against 3.75 for Substack links, a difference too small to matter. The algorithm's suppression appears to trigger on the mere presence of a URL, not on where that URL leads. What differs sharply is what happens after the click: external links convert at only about 0.147 subscribers per Note - less than half of what a same-platform Substack link returns - and have a 92.4% chance of producing zero subscribers at all. In other words, you pay the same reach tax either way, but a link to your own publication has a real shot at converting that suppressed reach into a subscriber, while a link to YouTube or a news article usually just spends your reach for nothing in return.

The worst combination: short Notes with links

Length interacts with the link penalty in an important way. A short Note with a link is the single worst-performing combination in the dataset - 40.7% of them finish with zero likes. The problem is structural: a short Note plus a link reads as a drive-by drop-and-run, giving a reader nothing to engage with beyond "here's a URL, go away now." The algorithm and the reader both seem to treat that combination as low-effort, and the reach reflects it.

Where the link sits in the Note matters more than whether it's there

This is the most actionable finding in the research: placement changes the outcome substantially. The best-performing 10% of link-carrying Notes open with the URL immediately only 5.0% of the time - compared to 17.0% for the bottom 90% of link-carrying Notes. The better performers also carry more setup before the link appears: an average of 339 characters of actual text before the URL, against 298 characters for the weaker performers. The pattern is consistent: leading with substance and dropping the link near the end, once you've given a reader a reason to care, outperforms leading with the link itself.

This lines up with a broader theme covered in this blog's mistakes research - Notes that read as complete, considered thoughts consistently outperform Notes that read as a vehicle for something else (a link, a plug, an ask), and a link dropped at the very top of a Note is the clearest version of that mistake.

Why this connects to what we know about the algorithm

None of this is arbitrary. Substack's own team has described the Notes algorithm as optimized to convert readers into subscribers, and a Note whose entire purpose is sending someone off-platform (or even to a different page within Substack) works against that specific goal - every click away from the feed is a reader the algorithm has to work harder to re-engage. Suppressing link-carrying Notes is a reasonably direct way for the system to keep readers inside the environment it's trying to optimize.

It's also worth noting Bluesky doesn't apply a comparable link penalty, which is one of the concrete, measurable reasons a link-heavy Notes strategy might be better served by cross-posting to Bluesky instead of eating the reach cost on Substack repeatedly.

So when is the tradeoff actually worth it

Given a consistent ~44% reach cost, the practical rule is to reserve links for Notes where the click genuinely is the point - not habitually add one to every Note as a reflex call-to-action. Specifically:

• Link when you're driving to a full post or paid piece that can't be meaningfully summarized in a Note anyway - the conversion value of getting someone to a piece designed to close the subscribe loop outweighs the reach tax on that specific Note
• Don't link when the Note works fine standalone - if the whole idea fits in the Note itself, adding a link for the sake of "driving traffic" pays the tax for no real return
• Prefer your own publication over external links when you do link, since the conversion data shows a same-platform link returning more than double the subscribers of an external one, for the same reach cost
• Give it real setup - write at least a few sentences of substance before the URL appears, rather than leading with it, since that alone separates the top 10% of link-carrying Notes from the rest
• Never combine a link with a short Note - that specific pairing produces the worst outcomes in the data, with roughly 2 in 5 finishing at zero likes

The bottom line

Links do measurably suppress reach on Substack Notes - the data backs that up clearly, not just as anecdote. But the penalty is a fixed cost that's worth paying selectively: when the destination is your own publication, when the Note has enough substance to earn attention before the link appears, and when the click is actually the point rather than an afterthought tacked onto an otherwise complete Note.

NotesIQ shows you exactly how your link-carrying Notes perform against your link-free ones, so you can see your own version of this tradeoff instead of guessing.