Substack's advertised ten percent is not the whole bill

The revenue mechanism

Substack lets anyone publish a free or paid newsletter without a setup fee. When a writer switches on paid subscriptions, two separate deductions apply before any money reaches the writer's bank account. The first is Substack's own cut, described in the platform's own cost guide as a flat 10% of each transaction. The second is payment processing, handled through Stripe rather than Substack itself, which charges its own card fee plus a separate recurring-billing fee on top of Substack's share. The mechanism is a revenue share, not a subscription fee charged to the writer directly: Substack earns only when a reader pays, and takes its 10% before Stripe's charges are even applied.

What the documents show

The cost guide states the Stripe portion as a 2.9% plus $0.30 credit-card fee, plus a separate 0.7% billing fee for recurring subscriptions, a rate the same document says took effect in July 2024 and replaced an earlier 0.5% rate for creators who had connected Stripe before that date. A living fee schedule that has already changed once, by its own account, can change again. Separately, Substack's terms of use class the publication, its subscriber list, and any uploaded text or images as content the writer creates and controls. A third support article on exporting an email list confirms a writer can download the subscriber list as a spreadsheet at any time from the dashboard.

The assumptions exposed

The advertised 10% figure is not the whole cost of a paid Substack; it is Substack's cut alone, quoted separately from Stripe's fees, so a writer who only remembers '10 percent' will overstate what actually reaches them. None of these figures is independently audited; all are the companies' own published rates, retrieved here on 16 September 2026, and none guarantees future stability, as the 2024 billing-fee change already shows. This is an editorial distinction, not one the cited pages state directly: owning an exported list is not the same as being able to keep charging those subscribers elsewhere. The export article describes downloading contact records, not migrating an active Stripe subscription, so a writer who leaves still needs each paying reader to re-enter payment details on a new platform.

What to check before you rely on it

Before treating Substack's economics as fixed, a publisher should read the current fee schedule at the date of signing up rather than relying on secondhand summaries, since the rate has moved before. This is an editorial checklist, not a claim any single cited document makes as a set of instructions.

• What does a recent Stripe payout on your own account show as the separate Substack cut, card fee, and billing fee lines?
• If you exported your list today, would it include what you need to rebill subscribers on another platform, or only contact details?
• Is your account still on an older Stripe billing-fee rate, and is there a stated date when that grandfathering ends?

None of this is a reason to expect a fixed net rate: it is a reason to read the current documents rather than repeat a remembered percentage.