Yes — you can publish a book today without a traditional publisher, but three separate decisions shape what you actually earn: whether to buy your own ISBN, which Amazon KDP royalty tier your ebook qualifies for, and whether to add IngramSpark for retail and library reach beyond Amazon. Get those three choices wrong and a $2.99 ebook can quietly pay you less than half of what it should.
Do indie authors need to buy their own ISBN?
Not for a Kindle ebook sold only on Amazon — KDP assigns a free identifier for that. But if you want a paperback, hardcover, or an ebook distributed to other retailers under your own imprint rather than a platform's free number, you need a real ISBN, and per Bowker's self-publisher pricing page, a single ISBN costs $125.00, while a 10-pack costs $295.00. Bowker's page describes the 10-pack as “the most commonly purchased ISBN package,” since most self-publishers need a separate ISBN for each format of the same title — ebook, paperback, and hardcover each require their own number if sold outside a single platform’s free system.
The math is worth doing before you buy: a single ISBN at $125 makes sense for a one-off release, but at $29.50 per number, the 10-pack becomes the better deal the moment you plan more than two formats across two books. Neither price includes the cover design, editing, or formatting work that goes into a listing — the ISBN fee only buys the identifier and the publisher-of-record listing that comes with it.
How much do Amazon KDP royalties actually pay?
KDP offers two tiers, and the gap between them is larger than most first-time authors expect. Per Amazon KDP’s help documentation, the 35% option pays “35% of your list price without VAT for each unit sold” and applies to every sale, everywhere, with no restrictions — it’s the fallback tier. The 70% option pays “70% of your list price without VAT, less delivery costs... for each eligible book sold to customers in the 70% territories, and 35% of the list price without VAT for each unit sold to customers residing outside the 70% territories,” according to the same documentation.
Two details from that page catch new authors off guard. First, delivery costs on the 70% tier “average $0.06 per unit sold” but scale with file size, so an image-heavy ebook costs more to deliver than a text-only one, quietly shaving the effective royalty. Second, eligibility isn’t universal: Amazon’s documentation states that “works in the public domain or consisting primarily of public domain content are only eligible for the 35% royalty option,” which matters for authors working from historical source material or public-domain compilations.
What does IngramSpark do that KDP doesn’t?
KDP’s print-on-demand reaches Amazon’s own storefronts. IngramSpark’s is built for everywhere else. Per IngramSpark’s user guide, the platform makes titles available to “over 40,000 independent bookstores, online stores, chain stores, libraries, schools, universities and ebook retailers,” including Barnes & Noble, Apple Books, and Kobo — the library and independent-bookstore channels that KDP’s print arm does not reach on its own. For ebooks specifically, IngramSpark’s guide states that “publishers receive 85% of the net revenue received by IngramSpark for every sale,” a different structure from KDP’s list-price percentage, since it’s calculated on the net amount IngramSpark collects from each retailer rather than the author’s set list price.
IngramSpark isn’t free to maintain, though the ongoing costs are narrower than they look at first. The user guide specifies a flat $25 revision fee “after the eproof is approved” for any resubmission of a completed title, and a separate ebook conversion service priced at “$0.60 USD per page,” which takes about 15 business days — a cost that only applies to authors who need IngramSpark to build the ebook file rather than uploading their own. Beyond the initial title setup, the guide is explicit that “there are no additional fees or charges required to make the title available for sale in additional markets,” meaning the wide retail reach itself doesn’t carry a recurring toll once a title is live.
Should indie authors use KDP and IngramSpark together?
Nothing in either platform’s documentation prevents it, and the two aren’t really competing for the same shelf. A practical split, drawn only from what each source states: KDP for Kindle ebooks and Amazon print, where the 70%-tier royalty and Amazon’s own search traffic do the work; IngramSpark for the paperback and hardcover editions destined for library systems, independent bookstores, and international retailers Amazon’s print program doesn’t service the same way. Running both means paying for two setups and, per IngramSpark’s fee schedule, a $25 revision charge any time a completed IngramSpark title needs a fix — a cost KDP’s documentation does not describe as applying to its own print listings.
| Decision | Cost / rate | Source |
|---|---|---|
| Single ISBN (Bowker, US) | $125.00 | Bowker self-publisher pricing page |
| 10-pack ISBN (Bowker, US) | $295.00 ($29.50/each) | Bowker self-publisher pricing page |
| KDP ebook royalty — standard | 35% of list price, all territories | Amazon KDP eBook Royalties help page |
| KDP ebook royalty — eligible | 70% of list price minus delivery costs (70% territories); 35% outside them | Amazon KDP eBook Royalties help page |
| IngramSpark ebook royalty | 85% of net revenue IngramSpark receives | IngramSpark user guide |
| IngramSpark revision fee | $25 per resubmission after eproof approval | IngramSpark user guide |
| IngramSpark ebook conversion service | $0.60 per page, ~15 business days | IngramSpark user guide |
None of the three sources here establish per-title setup fees for IngramSpark's initial upload, exact delivery-cost figures beyond the stated average, or how KDP's price-matching royalty interacts with international VAT bands — an author budgeting a specific launch should check the current fee schedule directly before committing.
For a related business news perspective, read How Do Ebook Royalties Actually Work for Indie Authors?.