KDP vs IngramSpark: Which Print-on-Demand Platform Should You Use in 2026?

KDP (Kindle Direct Publishing) and IngramSpark are the two dominant print-on-demand and distribution platforms for self-published authors in 2026. Choosing between them, or using both, is one of the most significant infrastructure decisions a self-published author makes, affecting print quality, distribution reach, royalty income, and bookshop accessibility for years.

The common advice to "just use both" is correct in principle but glosses over the practical complexity of setting up both platforms simultaneously, managing potential ISBN conflicts, and navigating overlapping distribution channels. This guide gives you the full picture: what each platform does, where each performs better, what the real costs and royalty differences look like, and exactly how to use both together without the problems that trip up most authors who try it.

Kindle Direct Publishing is Amazon's self-publishing platform, handling both eBooks and print books (print-on-demand) for the Amazon marketplace. It is free to use, requires no setup fee, and provides immediate access to Amazon's customer base, the world's largest book retailer, accounting for approximately 65% of US book sales and a dominant share of online book sales globally.

KDP's print-on-demand service (formerly CreateSpace, merged into KDP) prints books individually as they are ordered and ships them to customers. This eliminates the need for an author to hold inventory, no upfront printing cost, no warehouse, no fulfillment logistics. When a reader orders your book on Amazon, a copy is printed and shipped on demand.

KDP provides a full suite of publishing tools: a guided setup process for both eBooks and print books, a royalty calculator to preview earnings at different price points, a cover creator for basic cover design, and the KDP dashboard for tracking sales and royalties.

For eBooks, KDP offers the KDP Select program, enrollment in Kindle Unlimited (KU), Amazon's subscription reading service, in exchange for 90-day exclusivity windows (renewable). KU provides access to Kindle Unlimited's subscriber base and pays royalties based on pages read (KENP rate). For authors in high-KU genres like romance and fantasy, this program can significantly increase total earnings from the eBook.

KDP distributes primarily within the Amazon ecosystem. The "Expanded Distribution" option extends print book distribution to non-Amazon channels including booksellers, online retailers, and libraries, but this distribution is powered by Ingram's infrastructure, offered at lower royalty rates than distributing directly through IngramSpark, and with less control over the terms.

The key limitation of KDP's expanded distribution is the lower wholesale discount it offers retailers. Bookshops purchasing through standard wholesale terms expect 40% to 55% discounts off the retail price. KDP's expanded distribution structure limits your ability to offer standard wholesale terms, which is why bookshops frequently cannot or will not stock KDP-printed books, the economics do not work for them.

KDP's print quality has improved substantially and is now genuinely good for most book categories, trade paperbacks, standard non-fiction, and most fiction. The ink is vibrant, the binding solid, and the paper options adequate for standard publishing needs. KDP's printing facilities in the US, UK, and other territories mean fast fulfillment times for Amazon customers.

KDP print limitations: the paper and binding options are more limited than IngramSpark, hardcover options are more restricted, and certain specialty printing specifications (specific paper stocks, premium options) are unavailable.

IngramSpark is the self-publishing arm of Ingram Content Group, the world's largest book distributor. Ingram distributes books to over 40,000 retail outlets, libraries, and international channels globally. When a bookshop, library, or online retailer (other than Amazon) orders a book, the chances are high that the order is fulfilled through Ingram's distribution infrastructure.

IngramSpark offers print-on-demand, eBook distribution, and direct access to Ingram's full distribution network. Setup requires a one-time fee per title (currently $49 for print and eBook combined, or $25 for print only) and requires you to supply an ISBN; IngramSpark does not provide free ISBNs as KDP does. You must purchase your own ISBNs from Bowker (in the US) or your country's national ISBN agency to use IngramSpark.

The critical advantage of IngramSpark over KDP is wholesale discount control. You set your wholesale discount, typically 55% for retail distribution that allows for bookshop returns, and IngramSpark distributes your book to its full network on those terms. This is how traditionally published books are distributed, and it is what makes your book orderable (and returnable) by physical bookshops.

IngramSpark distribution covers: physical bookshops (Barnes & Noble, independent bookshops globally), online retailers (Barnes & Noble online, Book Depository, Waterstones, Booktopia, and hundreds of others), academic and public libraries, international markets across Europe, Australia, and beyond, and specialty retailers.

The practical significance: a reader in the UK who wants to order your paperback from a local bookshop can do so if you are on IngramSpark and have set appropriate distribution settings. That same reader cannot do so through KDP, whose distribution reach is primarily Amazon-centric.

IngramSpark's print quality is generally considered the gold standard in self-publishing print-on-demand. The paper stock options are more extensive, the binding quality is consistently high, and the color printing is excellent, making IngramSpark the preferred platform for books where print quality is a significant selling point (art books, photography, children's illustrated books, premium non-fiction).

IngramSpark also offers hardcover options that are more robust than KDP's, including case-laminate and jacket hardcovers, formats that more closely replicate traditionally published hardcover editions.

Royalties on print books depend on cover price, printing cost, and wholesale discount. Both platforms use the same basic formula: Cover Price × (1 − Wholesale Discount) − Printing Cost = Royalty. The differences come from printing costs and available discount structures.

The apparent paradox: KDP royalties for Amazon sales are higher than IngramSpark royalties because KDP uses its preferred distribution rate (40% wholesale discount on Amazon.com), while IngramSpark requires a 55% to 60% wholesale discount for wide distribution. When you set up IngramSpark for wide distribution and exclude Amazon (directing Amazon sales to KDP instead), each platform is optimised for its intended channel.

ISBNs (International Standard Book Numbers) determine publisher of record on your book, a detail with real practical consequences that many authors overlook until they encounter a problem.

KDP provides free ISBNs for print books. The catch: KDP-assigned ISBNs list Amazon as publisher of record in Books in Print, the industry database used by libraries, bookshops, and publishers to look up book details. This makes the KDP origin of your book visible in industry databases and prevents you from using that ISBN on any other platform.

For authors distributing exclusively through Amazon, KDP's free ISBN is perfectly fine, there is no functional disadvantage for that use case. For authors who want library cataloguing, bookshop ordering, or IngramSpark distribution, the KDP ISBN is limiting.

Purchasing ISBNs from Bowker (in the US) allows you to list your own imprint or company name as publisher of record. A 10-pack of ISBNs costs $295 from Bowker; a 100-pack costs $575. For an author publishing multiple books, the per-ISBN cost becomes modest ($5.75 per ISBN at the 100-pack level), and the professional and practical advantages of being listed as your own publisher justify the investment.

Using your own ISBN, you can use the same ISBN across KDP and IngramSpark (for the same edition), maintain consistent industry records, and position your imprint as the publisher rather than Amazon.

The optimal distribution setup for most self-published authors is KDP for Amazon sales + IngramSpark for everything else. Here is exactly how to set this up correctly: