Do I need IngramSpark if I publish with KDP?

Only if you want what Amazon's distribution does not carry: bookshops, libraries and other online retailers ordering through the book trade. A book selling only on Amazon is fully served by KDP. The moment the plan includes a local bookshop, a library system or Barnes & Noble's website, Ingram's catalogue is the door those buyers order through.

Can I use both KDP and IngramSpark for the same book?

Yes, and most widely distributed books do — usually with the same ISBN, Amazon editions on KDP and trade distribution on IngramSpark. The one configuration to avoid is IngramSpark's Amazon channel on a book that KDP already distributes: two suppliers competing for the same orders cuts your margin on every copy Amazon sources from the wrong one.

Which pays more per copy?

On Amazon, KDP: its royalty structure is set up to maximise what you earn on Amazon's own sales. IngramSpark copies sold on Amazon are effectively trade copies bought at a wholesale discount, which pays you materially less per unit. On a bookshop order, the arithmetic flips — the trade discount is the price of admission, and KDP has no such door.

What is the difference between returns and no returns?

Bookshops can only stock books they can send back. IngramSpark lets you accept returns — you pay for unsold copies, net of salvage — which is one of the conditions of real shelf placement. KDP print editions are non-returnable, which is one reason bookshops rarely order from them.

KDP or IngramSpark: where to print your book

Amazon’s KDP and IngramSpark are both print-on-demand: no inventory, no upfront print run, the book manufactured when ordered. The similarity ends at the business model. KDP is a retailer with a printer. IngramSpark is the book trade’s warehouse with a printer — Ingram is the distributor most bookshops and libraries already order through, and the service exists to put a book into that catalogue.

Choosing between them is choosing where the copies are sold, and the answer is different per channel — which is why the end state for most seriously distributed books is both.

What each one is

KDP prints the editions Amazon sells on Amazon. It is free to set up, fast to fix, pays the strongest per-copy royalty on Amazon sales, and its reach outside Amazon — “expanded distribution” — is a slow, low-priority channel that exists mostly so the listing can say it exists.

IngramSpark puts the book into the Ingram catalogue, which is the ordering system bookshops, libraries and other retailers actually use. An order from any of them routes to the nearest Ingram printer, the book is printed and shipped, and the retailer deducts its wholesale discount — typically 40 to 55 per cent of list, your choice — before remitting the rest. It charges a per-title setup fee (US$25 at the time of writing; the figure has changed before, so check), and it offers returns, which bookshops require before they will shelve a title.

The per-copy arithmetic, honestly

The two services pay differently because they are selling to different buyers:

Sale	Via KDP	Via IngramSpark
A customer buys on Amazon	Best royalty: retailer share minus print cost	Wholesale discount deducted — materially less
A bookshop orders the book	Practically never happens (no trade terms, no returns)	Trade sale at your chosen discount
A library orders the book	Only if it finds the listing	Routine — libraries order through Ingram
Another retailer orders it	Expanded distribution, eventually	Direct from the catalogue

The consequence that surprises people: putting IngramSpark’s Amazon channel on a book that KDP distributes makes your own best channel pay you less, because Amazon may source some copies from Ingram at wholesale terms. The standard configuration avoids it deliberately: Amazon editions on KDP, everything else through Ingram.

The ISBN dependency

IngramSpark requires your own ISBN — it cannot carry Amazon’s free identifier into the trade, because that number belongs to Amazon’s edition. This is the moment the ISBN decision becomes a purchase: trade distribution and owned ISBNs are the same decision.

A further refinement worth knowing: the same book can carry different ISBNs on the two services — one for the Amazon edition, one for the trade edition — which makes the channels’ sales independently visible and prevents the sourcing competition entirely. The cost is two ISBNs and two listings to maintain; the benefit is clean data on where copies are actually selling.

Quality and proofs

Both services print well; the differences are marginal and per-title. What matters is the same for both: order the proof. A proof costs print price plus shipping, arrives in days, and is the only test that involves your hands — the cover finish, the ink density, the binding, the trim. The print-ready checklist catches what files get wrong; the proof catches what files get right.

One print-quality note that is not marginal: KDP and Ingram use different paper stocks, and the same interior’s page count can differ slightly between them — which changes the spine width, which changes the cover. A book published through both needs its cover checked against each service’s spine calculation, per setting up a cover file, not assumed from the other’s.

The decision, per book

Amazon-only audience — an ebook-first author adding a paperback for the listing: KDP alone. Simplest, cheapest, fully sufficient.
Amazon plus a real-world presence — launch events, local shops, libraries: KDP for Amazon, IngramSpark for the trade. The common end state.
Trade-first book — a library market, academic reach, the gift-shop circuit: IngramSpark carries it, with KDP supplying the Amazon listing.

And the sequencing rule from publishing generally: the interior and its page count come first. Both services price, bind and shelve from the page count; both print from the same PDF; and the cover waits on the final count either way. The distribution choice is a business decision that can be made late. The book is not.

The two services answer two different questions — where do Amazon’s customers buy this and where does the book trade order this from — and the confusion comes from asking one of them to answer both. Once separated, the choice per edition is usually obvious.

Nueel exports the print-ready PDF either service requires, and checks it against each platform’s published requirements before the upload rather than after the rejection.

Common questions

Do I need IngramSpark if I publish with KDP?: Only if you want what Amazon's distribution does not carry: bookshops, libraries and other online retailers ordering through the book trade. A book selling only on Amazon is fully served by KDP. The moment the plan includes a local bookshop, a library system or Barnes & Noble's website, Ingram's catalogue is the door those buyers order through.
Can I use both KDP and IngramSpark for the same book?: Yes, and most widely distributed books do — usually with the same ISBN, Amazon editions on KDP and trade distribution on IngramSpark. The one configuration to avoid is IngramSpark's Amazon channel on a book that KDP already distributes: two suppliers competing for the same orders cuts your margin on every copy Amazon sources from the wrong one.
Which pays more per copy?: On Amazon, KDP: its royalty structure is set up to maximise what you earn on Amazon's own sales. IngramSpark copies sold on Amazon are effectively trade copies bought at a wholesale discount, which pays you materially less per unit. On a bookshop order, the arithmetic flips — the trade discount is the price of admission, and KDP has no such door.
What is the difference between returns and no returns?: Bookshops can only stock books they can send back. IngramSpark lets you accept returns — you pay for unsold copies, net of salvage — which is one of the conditions of real shelf placement. KDP print editions are non-returnable, which is one reason bookshops rarely order from them.