LinkedIn newsletter or Substack: The 2026 numbers for a UK professional building an audience around a job

On 15 September 2026, Marketing Week reported research by IAB UK and the Institute for Advertising and Media Statistics (IRM) which projects that UK creator partnership revenue will pass £1 billion for the first time this year, reaching £1.217 billion, up 26% on the £966 million recorded for 2025. That money is going to people who publish regularly to an audience they built themselves. A growing share of them hold a full-time job while they do it.

For an employed UK professional, the practical question is not whether to build an audience but where to build it. Two options dominate the conversation in 2026: a LinkedIn newsletter, which sits inside the platform where your professional contacts already are, and a Substack, which sits on an email list you own and can charge for. Both are free to start. They differ sharply on ownership, reach, money and risk.

This post sets out the mechanics of each from the platforms' own help pages, the fees as published, the reported price points for UK paid newsletters, and what the Ofcom data says about where UK attention actually goes. It ends with a worked example of one professional posting weekly for 12 months on each, so you can see the arithmetic before you commit your evenings.

How a LinkedIn newsletter actually works

LinkedIn's own help pages, checked in September 2026, state that all LinkedIn members can create a newsletter. The 150-follower threshold that people still quote applies to company Pages, which LinkedIn says must have more than 150 followers or connections, a history of original content and a good standing record before they are evaluated for access. An individual with a normal profile can start today.

The reach mechanics are the reason people choose it. According to LinkedIn's newsletter FAQ, when you publish your first edition, LinkedIn invites your connections and followers by notification to subscribe. When someone new follows you later, an invitation to subscribe is sent automatically. After every edition, LinkedIn sends push, in-app and email notifications to all your subscribers, with a rule that prevents the same alert reaching a person on more than one channel.

That is a distribution engine you do not have to build. It is also a distribution engine you do not control. LinkedIn's help pages say an author can see subscribers' names, profile photos, job titles and headlines, subject to their privacy settings. They say nothing about exporting the list, and in practice the subscribers belong to the platform. If your account is restricted, or LinkedIn changes how newsletters are surfaced, the audience goes with it.

How Substack works, and what it costs

Substack's model is the reverse. The email list is yours, you can export it, and you can charge. Substack's own About page states that writers keep 90% of their revenue minus credit card fees, which means Substack takes 10% of paid subscription income and nothing on free publications. According to Substack's support pages, the minimum price for a paid publication is $5 a month or $30 a year on US-dollar accounts, with other currencies varying.

The card fees are the part most comparisons skip. Substack processes payments through Stripe, and Stripe's published UK pricing in September 2026 is 1.5% plus 20p per transaction for standard UK cards, 2.5% plus 20p for European Economic Area cards and 3.15% plus 20p for international cards, with a further 0.7% of billing volume on its pay-as-you-go recurring billing product. On a £5 monthly subscription paid by a standard UK card, the 20p alone is 4% of the price, before the percentage fees. Small price points carry proportionally heavier fees.

Substack gives you almost no built-in audience. There is a recommendations network and an app, but the honest position is that a Substack grows from readers you bring to it, usually from a social platform. Which brings most professionals back to LinkedIn as the top of the funnel, whichever home they choose for the newsletter itself.

Where UK attention goes: The Ofcom numbers

Ofcom's Online Nation 2025 report, published on 10 December 2025, found that UK adults spend an average of four and a half hours a day online, up 10 minutes on the previous year, and that half of all that time is spent on services owned by Alphabet and Meta. YouTube reaches 94% of UK adults and takes 51 minutes a day on devices other than television sets. The average adult uses around 41 apps a month.

Ofcom's Media Nations 2026 report, published on 29 July 2026, adds that YouTube viewing across home-connected devices rose to 41 minutes per person per day in 2025, from 33 minutes in 2022, with viewing on television sets doubling from nine to 19 minutes. LinkedIn does not feature in either report's headline figures, which is itself a data point: it is a professional-hours platform, not a time-sink platform, and that is what makes its audience valuable to a working professional.

The comparison, line by line

The table below is built only from the platform pages and reports named above. Where a cell describes effort or risk rather than a published figure, it is a judgement, and it is marked as such in the text that follows.

Ownership and reach pull in opposite directions, and that is the whole decision. LinkedIn gives you distribution you have not earned yet, on terms you do not set. Substack gives you an asset you own, and asks you to earn every reader.

What a 1,000-subscriber paid list actually earns

Third-party fee calculators aimed at UK writers, such as PayoutMath UK in 2026, model £5 a month as the common entry price for a UK Substack, with £10 as the upper end of the mass-market range. These are reported figures from pricing guides, not Substack data, so treat them as a range rather than a rule. The arithmetic below uses the low end and Stripe's published standard UK card rate.

That is a meaningful second income, and it is why the model attracts attention. The same arithmetic at 100 paid subscribers, which is a more realistic first-year milestone for a professional publishing part-time, comes to about £419 a month. The fee percentage is the same at both scales; the writing effort is nearly the same too. The difference is entirely audience.

Worked example: One professional, weekly, for 12 months

Take an employed engineer, accountant or manager who commits to one edition a week for a year. That is 52 editions. At three hours an edition, which is a fair estimate for 700 to 1,000 words with a chart or a table, the writing alone is 156 hours, or three hours a week of evenings. The question is what each platform returns for those hours.

On LinkedIn, the 52 editions go out with automatic invitations to every existing connection at launch and to every new follower after it, and each edition triggers push, in-app and email notifications to subscribers. The direct income is nil, because there is no paid tier. The indirect income is whatever the visibility produces: consulting enquiries, a digital product, speaking, or a better job. The post on turning LinkedIn authority into paid client work covers the conversion step, which is where the money actually appears.

On Substack, the same 52 editions go to a list that starts at zero and grows only as fast as you promote it. If the professional turns on a £5 tier and finishes the year with 100 paying readers, the arithmetic above gives roughly £419 a month by month 12, or perhaps £2,500 across the year as the list builds. The list, however, is theirs, and every one of those readers gave an email address that will still work if the platform does not.

The common practice among professionals who do this well is to treat the two as a pair rather than a choice. They post short-form on LinkedIn most days, each post ending with a single call to action pointing to a free guide or a sign-up, and they send one longer piece a week to an email list they own. My own weekly newsletter, The Parallel Operator, goes out on Mondays on exactly that pattern: the daily posts feed the list, and the list is the asset.

Which one, and in what order

If you are starting from a small network and have never published, start with LinkedIn. The invitation and notification mechanics described in LinkedIn's help pages give you an audience for edition one that a Substack cannot, and the feedback loop is faster. Give it a fixed test period rather than an open-ended commitment; the post on the 90-day rule explains how to set that up without burning out around a job.

If you already have a network that responds, or you have a subject people would pay to read, start the email list now and use LinkedIn to fill it. The 10% fee and the card charges are the price of owning the list, and on the arithmetic above they are a small price. The mistake is not choosing the wrong platform. The mistake is spending a year building on rented ground with no way to move the audience when you need to.

Either way, the constraint for an employed professional is not talent or platform. It is three hours a week, kept for 52 weeks. Choose the platform that makes those hours easiest to keep, and read the post on building a personal brand on LinkedIn that creates income opportunities before you publish edition one.

This article is general information, not legal, financial or tax advice. Platform fees, features and eligibility rules change; check the platforms' own help pages before relying on any figure here. Income from a paid newsletter is taxable in the UK, and you should take independent advice and check GOV.UK on your own position.

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