KDP vs IngramSpark: which should self-publishing authors use?
An honest comparison of Amazon KDP and IngramSpark for self-publishing authors — reach, royalties, setup fees, returns, hardcover, proofs and trim specs — and why most authors quietly use both.
For most self-publishing authors the honest answer is: use both. Print with Amazon KDP for Amazon itself — the biggest book retailer on earth, best royalties there, cheapest author copies — and use IngramSpark for everything else: bookshops, libraries and the wholesale catalogue that booksellers actually order from. They are not rivals so much as two halves of one distribution plan.
What is the real difference between KDP and IngramSpark?
Both are print-on-demand: a copy is printed only when someone buys it, so you carry no stock and no upfront print bill. But they point at different shelves. KDP exists to sell your book on Amazon’s own storefronts — and it does that better and cheaper than anyone. IngramSpark exists to feed the rest of the trade: it lists your title in the Ingram wholesale catalogue that physical bookshops, libraries and other online retailers browse and order from worldwide.
Put plainly, KDP owns the Amazon customer. IngramSpark owns the route to the high-street bookshop and the library acquisitions desk. If your distribution plan only has one of them in it, you are leaving a whole channel of readers unserved.
Which one reaches more readers?
Amazon is where the overwhelming majority of self-published copies sell, so KDP’s reach into that single channel is unmatched — and a KDP-printed book appears on Amazon fast, usually within a day or two of going live. What KDP does not do well is reach beyond Amazon. Its own “expanded distribution” exists, but bookshops are famously reluctant to order a book that is printed by their largest competitor.
That is the gap IngramSpark fills. Through Ingram, your title sits in the same catalogue as the major publishers, discoverable by tens of thousands of retailers and libraries across many countries. If you want a local bookshop to stock you, or a library system to buy you, IngramSpark is the listing that makes it possible.
How do royalties and printing costs compare?
KDP generally pays a higher net royalty on Amazon sales because there is no middle layer taking a cut — Amazon prints it, Amazon sells it, you keep more. IngramSpark sales run through wholesale, where you set a trade discount (commonly 40–55%) that the bookshop or retailer keeps, so your per-copy take is lower. That lower margin is the price of being orderable by the wider trade — and it is usually worth paying for the channels KDP can’t reach.
| Factor | Amazon KDP | IngramSpark |
|---|---|---|
| Best for | Selling on Amazon | Bookshops, libraries, the wider trade |
| Reach | Amazon storefronts worldwide | 40,000+ retailers and libraries globally |
| Royalty on its own channel | Higher (no wholesale cut) | Lower (you set a trade discount) |
| Setup fee | Free | Free (no title setup fee) |
| Author copies | Cheapest available | At print cost, but pricier than KDP |
| Hardcover | Limited sizes and bindings | Broad — case laminate and dust jacket |
| Returns to bookshops | Not really a factor | Returnable option available (use with care) |
| Proof copies | Cheap, fast physical proofs | Available, slower and pricier |
What about setup fees, returns and hardcover?
KDP charges nothing to set up a title. IngramSpark dropped its per-title setup fee in 2023, so title setup is free in 2026 — there is no longer a setup charge to waive. It does, however, take a small market-access fee (around 1.875% of list price, as of early 2026) on books sold through its global distribution network.
Returns are an IngramSpark-only consideration. Bookshops generally won’t stock a title unless it is returnable, because the trade runs on sale-or-return. Enabling returns makes you orderable, but you carry the risk of unsold copies coming back. Many cautious authors choose the “returnable, destroy” setting rather than paying to have stock shipped back.
Hardcover is where IngramSpark pulls ahead. KDP’s hardcover support has grown but stays limited in sizes and binding styles. IngramSpark offers a far broader range — including case-laminate and proper dust-jacket editions — which matters for gift books, poetry, and any title you want to feel like an object on the shelf. Our print-preparation service builds either binding to spec.
Do KDP and IngramSpark use the same trim sizes and file specs?
Mostly, but not exactly — and the mismatches are precisely where files get rejected. The two platforms publish different requirements for bleed, margins, spine-width calculation and cover-wrap dimensions, and a hardcover wrap on IngramSpark is a different file from a KDP paperback wrap. A file that sailed through KDP can bounce off IngramSpark’s preflight over a few millimetres.
This is the single most common stumble for authors running both: they build for one and assume the other will accept it. It usually won’t. The fix is to build each file to its own platform’s published spec from the start — which is exactly what we do, so the same book passes both the first time. If you’re weighing print-on-demand against a traditional print run, our print-on-demand vs offset guide covers the economics of each.
How do you run both without them competing?
The mistake that trips up authors using both is letting the two platforms fight to supply the same retailer. KDP offers its own “expanded distribution” into the wider trade, and so does IngramSpark — switch both on and Amazon may try to source your book through KDP while a bookshop sources it through Ingram, with unpredictable pricing and listing glitches as a result.
The clean configuration most experienced self-publishers use is simple: turn KDP’s expanded distribution off and let KDP do only what it does best — sell on Amazon. Then let IngramSpark handle all non-Amazon distribution: bookshops, libraries and other online stores. Each platform owns one lane, neither steps on the other, and your book is available everywhere with a single, predictable price. Keep the same ISBN logic clear too — many authors use a separate ISBN for the IngramSpark edition so the trade catalogue lists a cleanly distributed title.
One more practical point: order a physical proof from each platform before you go live. KDP’s proofs are cheap and quick; IngramSpark’s cost a little more and take longer, but seeing the actual hardcover wrap and paper stock in your hands is the only way to catch a problem a screen will never show you.
So which should you actually choose?
If you genuinely must pick one: choose KDP if nearly all your sales will be on Amazon and you want the best margin and cheapest copies there. Choose IngramSpark if bookshop and library presence matters more than Amazon margin. But the strategy seasoned self-publishers land on is to run both — KDP for Amazon, IngramSpark for everywhere else — and many even turn off KDP’s expanded distribution so the two don’t compete to supply the same retailer.
The catch is that running two platforms means two sets of print files built to two specs, with hardcover and paperback handled separately. That is the part we take off your desk. We prepare press-ready interior and cover files built to pass both KDP and IngramSpark the first time, hardcover or soft, with a fixed quote upfront and two revision rounds — and you keep every source file. Start with print preparation, or send us your manuscript and we’ll advise on the right distribution mix.
Frequently asked questions
Can I publish the same book on both KDP and IngramSpark at once?+
Yes, and most authors should. The usual approach is to print on KDP for Amazon and use IngramSpark for the wider trade. One caution: don’t switch on KDP’s “expanded distribution” if IngramSpark is already feeding those same retailers, or the listings can clash. We build your files to pass both platforms first time, so the same interior and cover work everywhere.
Do I need a different ISBN for KDP and IngramSpark?+
Each print edition and format needs its own ISBN, but you can use one ISBN you own across both platforms for the same paperback — that keeps a single, unified listing. KDP offers a free ISBN, though it ties the book to Amazon. Rules vary by country, so check your national ISBN agency. With Librum you keep all rights and your editable source files, so you stay free to choose.
What trade discount and returns setting should I choose on IngramSpark?+
A trade discount of 40–55% is typical; bookshops often expect the higher end before they’ll order. Enabling returns can make shops more willing to stock you, but unsold copies can be returned at your cost, so use it carefully. These are commercial choices that affect your margin — review IngramSpark’s current terms directly, as they can change.
How long does it take to get a print book live, and what files do I need ready?+
A KDP-printed book usually appears on Amazon within a day or two of going live; IngramSpark’s wider catalogue listings can take longer to reach every retailer. You’ll need a print-ready interior PDF and a full cover PDF sized to your page count. At Librum we prepare your print-ready files for both platforms and give you a fixed quote upfront, so there are no surprises.