Every episode you published in 2023 is still sitting there, still getting downloaded, still earning you nothing. Substack just proposed a fix.

On October 21 the platform opened early access signups for podcast sponsorships that combine dynamic ad insertion with its existing subscription and community tools. Until now, podcasters on Substack had to record sponsorships directly into episodes.

That's the part worth slowing down for. On most podcast hosts, an old sponsorship stays baked into your archive forever unless you re-edit and re-upload every affected file. Dynamic insertion means you swap the read once and it updates everywhere, including episodes published years ago.

For a coach with four years of back episodes and a steady trickle of evergreen downloads, that archive stops being a portfolio piece and starts being inventory.

The size of the room

Substack said podcasters publishing on its service collectively generate more than $200 million annually from subscriptions alone, and pointed to creators such as Scott Galloway, who offers paid subscribers ad-free and bonus episodes, and Shea Serrano, who uses Substack Chat to bring subscribers into the conversation.

Note what Galloway is doing there. Ad-free is the paid tier. The ads are what free listeners get.

If you hate selling sponsorships, there's a hatch: podcasters who would rather not find sponsors themselves will soon be able to tap into third-party sponsorship marketplaces to fill the ad breaks they mark in their episodes, with participation completely optional and creators setting the guardrails — how many ads run and which types of sponsors they are comfortable with.

Substack also recently earned IAB Tech Lab certification for podcast download measurement, giving podcasters industry-standard data they can use to pitch sponsors. That matters more than it sounds. It's the difference between "trust me, people listen" and a number a media buyer recognises.

Two things are not settled

Substack's announcement does not state a revenue share, and Adweek reports monetisation begins in earnest in 2027. Substack has not named the marketplaces, given a date for either piece, or said what cut it or the marketplaces will take. For context, its published fee is 10% of paid subscription revenue, with no monthly charge for hosting.

The trade press is skeptical about execution, too. Dynamic ad insertion has given even some of the largest companies in podcasting significant trouble, according to Bryan Barletta, a partner at podcast firm Sounds Profitable.

The setup window

So treat this as a prep period, not a payday. Trade coverage advises the same: request early access if you host on Substack, but don't put 2027 ad income in a budget — and ask Substack in writing for the revenue share and the partners behind the marketplaces.

The harder question is strategic. A coaching podcast isn't a media property; it's a lead list that talks back. Every marked break you hand to a third-party marketplace is a break that isn't pointing at your own workshop, waitlist or discovery call. A programmatic mattress ad pays once. A listener who books a $4,000 engagement pays considerably better.

Mark your breaks now. Decide later who gets to stand in them.