ACX pays audiobook royalties on one of two plans, and unlike Kindle's ebook royalty split, the decision is not driven by a file-size delivery fee eating into one option. It comes down to a single trade: a higher royalty rate against a seven-year exclusivity commitment to Audible, Amazon, and iTunes.

That makes the audiobook decision simpler to calculate than the ebook one, but the stakes are arguably higher — exclusivity locks in for years, not per sale, and cannot be switched mid-term without ending and rebuilding the distribution agreement entirely.

The Two Plans

ACX royalties are a straight percentage of list price, with nothing subtracted for delivery or file size.

Royalty = List Price × Royalty Rate

  • 40% Exclusive: requires seven-year exclusive distribution through ACX, Audible, Amazon, and iTunes — no other audiobook retailer, no direct sales, no library platforms during that term
  • 25% Non-Exclusive: allows simultaneous distribution through other retailers, library platforms, and direct-to-listener storefronts, at a lower rate on ACX sales specifically

At an identical list price, the 40% plan always pays more per ACX sale — there is no break-even file size the way Kindle's 70%/35% ebook choice has, since ACX charges no delivery fee on either plan. The only reason to choose 25% is to unlock retailers the exclusivity would otherwise block.

A Worked Comparison

A $14.95 audiobook on the 40% plan pays 14.95 × 0.40 = $5.98 per ACX sale. The same title on the 25% plan pays 14.95 × 0.25 = $3.7375, rounding to $3.74 — a difference of $2.24 per sale, entirely attributable to the rate, since neither plan subtracts anything else from that calculation.

Over a run of 1,000 sales, that gap compounds to $2,242.50 in additional ACX royalty under the 40% plan at the same price and volume. The 25% plan only closes that gap, or exceeds it, if the extra distribution channels it unlocks generate meaningfully more total sales volume than staying exclusive to Audible would have produced on its own.

Why Audible's Market Share Matters to This Decision

Audible holds the largest share of the audiobook retail market by a wide margin, which is the core argument for the 40% exclusive plan: the higher rate applies to the channel where most audiobook buyers already are. For a debut author or a niche genre without an existing audience elsewhere, the case for staying inside that ecosystem at the better rate is strong.

The case for 25% strengthens for authors with an existing audience on another platform, or a strategy built around library placement or direct sales — situations where Audible exclusivity would cut off a channel that already converts, in exchange for a rate advantage on a channel that may add less on top of what is already working.

Splitting Royalties With a Narrator

Many audiobooks are produced under a royalty share agreement: a narrator contributes production work in exchange for a percentage of the royalty pool instead of an upfront production fee. The split — commonly even, though any split can be negotiated — is set in the ACX contract at production time, and applies to whichever plan's royalty pool the author has chosen. The figures above are the full pool ACX pays the rights holder before that split is applied.

The Choice Locks in Earlier Than It Feels Like It Should

Unlike Kindle's ebook royalty plan, which can be changed per title at essentially any time, ACX's exclusivity commitment is set when the audiobook is produced and distributed, and cannot be flipped mid-term without formally ending the existing agreement and rebuilding distribution from scratch. That makes this a decision worth making deliberately at production time rather than defaulting to whichever plan seems obviously better without checking the specific distribution goals for that title.

Frequently Asked Questions

Does ACX charge a delivery fee like Kindle's 70% ebook plan does?

No. ACX applies its royalty rate directly to list price with nothing subtracted for file size or delivery, unlike Kindle's 70% plan, which subtracts a per-megabyte delivery fee that can meaningfully reduce the effective royalty on large files.

Can I switch from the 25% plan to the 40% plan later?

Not without ending the existing non-exclusive distribution agreement and rebuilding it as an exclusive one, since the exclusivity commitment is fixed at production time rather than adjusted per sale.

Is there ever a list price where 25% actually pays more than 40% on ACX itself?

No — 40% of any list price is always more than 25% of the same list price on ACX sales specifically, since neither plan subtracts a separate fee. The 25% plan only wins in total earnings if it unlocks enough additional sales volume elsewhere to outweigh the lower rate on every platform, ACX included.

How is list price set for an ACX audiobook?

List price on ACX is typically constrained within bands tied to the audiobook's finished runtime, rather than freely chosen the way an ebook or paperback price is — worth checking before assuming any specific price point is available for a given title's length.

Does a royalty share agreement change the total royalty ACX pays?

No — a royalty share agreement splits the same royalty pool between author and narrator according to the percentage set in the ACX contract. It does not change the total amount ACX pays per sale, only how that total is divided between the two parties.

Run your own numbers with the Audiobook Royalty Calculator. For the ebook side of the same decision, see the Kindle royalty breakdown, and for print, the KDP Royalty Calculator.