The decision between KDP and IngramSpark is one of the most consequential choices a self-publisher makes. Both platforms get your book into global retail channels, but they pay you differently, control distribution differently, and suit different publishing goals. Understanding the royalty math before you commit can be the difference between a profitable title and a break-even one.
How KDP Royalties Work
KDP offers two royalty tiers for paperbacks: a standard rate based on list price minus printing cost. There is no 35%/70% split for paperbacks (that applies to Kindle eBooks). For print, KDP pays:
Royalty = (List Price × 0.60) − Printing Cost
The 0.60 multiplier reflects the 40% wholesale discount KDP takes for expanded distribution. For Amazon direct sales (excluding expanded distribution), the multiplier is higher. Printing cost varies by page count and interior type — a 300-page black-and-white paperback costs approximately $3.85 to print in the US.
Example: a 300-page novel priced at $14.99 through expanded distribution yields ($14.99 × 0.60) − $3.85 = $5.14 per copy. The same book sold directly on Amazon (without expanded distribution) yields a higher effective royalty because the wholesale discount is smaller.
How IngramSpark Royalties Work
IngramSpark uses a similar structure but with a key difference: the wholesale discount is set by the publisher, not the platform. You choose a discount percentage (commonly 40% to 55%) and IngramSpark distributes to its network of 40,000+ retailers.
Royalty = List Price − (List Price × Wholesale Discount) − Printing Cost
At a 40% discount on the same $14.99 book, the calculation is $14.99 − $5.996 − ~$4.05 (IngramSpark printing cost) = approximately $4.94. IngramSpark's printing costs run 5–10% higher than KDP's for comparable specifications, in most cases.
Where IngramSpark Wins
IngramSpark's distribution network is genuinely broader. It reaches bookstores, libraries, and academic institutions that KDP expanded distribution does not. If you want your book in brick-and-mortar stores or library systems, IngramSpark is the stronger choice. Retailers also prefer Ingram-distributed books because returns are accepted — something KDP does not support.
Where KDP Wins
For Amazon-dominant sales strategies, KDP pays more per copy because there is no intermediary taking a cut between you and Amazon's retail channel. If 80% or more of your expected sales come through Amazon, KDP direct often produces higher net royalties than the IngramSpark-to-Amazon path.
The Dual-Distribution Strategy
Many experienced self-publishers use both platforms simultaneously. They enroll in KDP without expanded distribution (to maximize Amazon royalties) and use IngramSpark for everything else: bookstores, libraries, international markets, and direct sales. This approach maximizes both per-unit royalties and distribution breadth, though it requires managing two separate cover templates and two upload workflows.
Calculating Your Actual Numbers
The royalty comparison changes significantly based on your specific page count, list price, and paper type. Use the Royalty Calculator to model exact per-copy earnings for both platforms side by side before choosing your distribution strategy.
Hardcover Distribution: Where the Real Gap Is
KDP added hardcover printing in 2021, but its distribution reach for hardcover remains narrower than IngramSpark's, which has decades of relationships with libraries, independent bookstores, and academic suppliers built specifically around hardcover and case-laminate formats. An author whose audience includes libraries or independent bookstores usually finds IngramSpark's hardcover reach the more significant factor, ahead of the royalty percentage difference between the two platforms.
For paperback, the gap is much smaller — both platforms reach the major online retailers effectively, and the royalty math becomes the deciding factor more often than distribution reach does.
The Returnability Difference and Why Bookstores Care
IngramSpark allows authors to mark a title as returnable, meaning bookstores can send back unsold copies for a refund, matching the standard practice publishers use with traditional distributors. KDP's paperback and hardcover titles are non-returnable by default.
Many independent bookstores decline to stock non-returnable titles at all, since a returnable arrangement is how they manage inventory risk on an unfamiliar author. Marking a title returnable on IngramSpark carries a cost — unsold, damaged returns are usually deducted from royalties — but it is often the difference between a bookstore agreeing to carry a title and passing on it entirely.
Frequently Asked Questions
Can I publish on both platforms for the same book?
Yes, and it is common practice — KDP for the Amazon-dominant online market, IngramSpark for wider retail and library distribution — as long as you use different ISBNs for each platform's edition, since KDP and IngramSpark cannot share one ISBN for print titles.
Does IngramSpark charge fees KDP does not?
IngramSpark charges a one-time setup fee per title and per revision, whereas KDP charges nothing to publish. For a single title with few revisions this is a minor cost; for an author revising covers or content frequently, it adds up.
Which platform pays out faster?
KDP pays royalties monthly, with roughly a 60-day delay after the sale in most cases. IngramSpark's payment schedule and thresholds vary by region and can involve a longer wait, particularly for smaller accumulated royalty amounts.
Do library sales come through either platform automatically?
IngramSpark's catalog reaches library ordering systems like OverDrive and Baker & Taylor directly. KDP titles are not automatically visible to those same library procurement channels, which is the practical reason authors targeting library sales lean toward IngramSpark.
Should a new author start with both platforms or just one?
Starting with KDP alone is common for a first title, since it is free to set up and captures the largest single online market. Adding IngramSpark later, once a book has some sales history, is a reasonable way to extend reach without the added cost and complexity from day one.
Compare your actual royalty numbers on both platforms with the royalty calculator, and see the wholesale mechanics behind the difference at the math of margin on KDP wholesale breakpoints.
There is no universal right answer. The better platform is the one that matches where your readers actually buy books.