The POD Revolution: KDP's Unstoppable March

Updated Oct 2026: this editorial has been rewritten and now cites its sources.

Print-on-demand has altered the cost of keeping a book in print. Rather than committing money to a print run and then paying to store the copies, an author or publisher can arrange for each copy to be printed at the moment a reader places an order. Amazon's Kindle Direct Publishing (KDP), which Publishers Weekly calls market-leading, is one service that works this way. This editorial explains how KDP's print-on-demand model operates, drawing on Amazon's own published terms, and weighs what the model offers against the limits that come with it.

How the model works

KDP prints a paperback or a hardcover at the point when a customer buys it. Amazon's print book pricing page lays out the economics. For sales made through Amazon's standard distribution, the royalty is either 50% or 60% of the list price, with the rate depending on the price, and the printing cost is then subtracted. For Expanded Distribution, which reaches other retailers, the rate is 40% minus printing.

The printing cost follows a published formula of its own: a fixed cost per book plus a cost per page, and both vary by marketplace and by ink type. KDP states that trim size, bleed settings and cover finish have no effect on printing cost. Because the formula is public, an author can work out a royalty before a book is ever published.

Hardcover

KDP added hardcover printing in 2021. Its announcement said hardcovers were available for books of 75 to 550 pages, with a case-laminate cover and no dust jacket, and that authors would continue to earn 60% royalties, with an additional printing cost. Amazon's hardcover help page lists the marketplaces in which hardcovers can be sold and notes that hardcovers are not eligible for Expanded Distribution.

Payment and cash flow

KDP pays royalties monthly, approximately 60 days after the end of the month in which sales are reported, or 90 days in the case of Expanded Distribution. For an author planning cash flow, that delay carries real weight. A launch in one month produces income roughly two months later.

The scale of the change

The growth of self-publishing indicates how widely the model has spread. Bowker data reported by Publishers Weekly show that self-published print and ebook output rose 38.7% in 2025 to more than 3.5 million titles, compared with 642,242 traditionally published releases. Over the period from 2022 to 2025, self-published output grew 43.5% while traditional output grew 10%. In 2023 alone, self-published titles with ISBNs topped 2.6 million, more than four times the 563,019 traditionally published titles released that year. As recently as 2017, PW has noted, annual self-published output had only just crossed one million titles for the first time.

Bowker's Andrew Kovacs told PW that "every aspect of the publishing process once available only through traditional publishers can now be obtained from the self-publishing service providers at a comparable level of quality." He also pointed out that publishing a title in several formats, hardcover, paperback and ebook, each carrying its own ISBN, adds to the count. Print-on-demand, with no print run per format, can make those additional formats cheaper to offer.

The income data suggest that the model can support a living for some authors. The Authors Guild's 2023 author income survey found that full-time self-published authors had a median book income of $12,800 in 2022, and that those who had been publishing since at least 2018 reported a median of $24,000, up 76% from 2018.

For ebooks enrolled in KDP Select, subscription reading supplies a further stream of income. KDP's Kindle+ (renamed from Kindle Unlimited in October 2026) royalty page explains that authors earn from the KDP Select Global Fund according to subscribers' reading and listening, measured in Kindle Edition Normalized Pages, and that they are paid the first time a subscriber reads or listens to a given page. Amazon said in 2024, according to Publishers Weekly, that KDP authors had earned more than $3.5 billion in Kindle Unlimited royalties over the program's first ten years, under its former name.

What the model removes, and what it does not

Print-on-demand removes two traditional costs: the upfront print run and the storage of unsold stock. A title can remain available indefinitely with no inventory cost attached. That makes it practical to keep backlist titles in print and to publish books whose expected audiences are small.

It does not remove the other costs of publishing. Editing, cover design, typesetting and marketing still have to be paid for.

Limits worth knowing

Several limits follow directly from KDP's published terms:

• Format choices are fixed. Hardcovers use a case-laminate cover and have no dust jacket.
• Hardcovers are Amazon-only. They cannot be enrolled in Expanded Distribution.
• Low-content books follow separate rules. KDP's low-content guidelines cover notebooks, planners and journals, which are not eligible for KDP's free ISBN.
• Daily title limits apply. In 2023 Amazon limited accounts to three new titles a day.

Authors who need features outside those limits, such as dust jackets or wider bookstore distribution for hardcovers, may pair KDP with other printers. IngramSpark, for example, allows publishers to set a wholesale discount between 40% and 55% for its distribution network. Its guidance notes that the trade discount most publishers offer booksellers is 55%, and that a lower discount can limit sales to booksellers.

Planning with the numbers

Because KDP publishes its formulas, an author is able to plan before making any commitment:

1. Estimate the printing cost from the page count and the ink type, using the fixed and per-page costs on KDP's print pricing page.
2. Set a list price that leaves a royalty worth the effort at the 50% or 60% standard rate.
3. Decide on Expanded Distribution, accepting the 40% rate in exchange for wider reach.
4. Plan for the payment lag of about 60 days after the end of the month of sale, or about 90 days for Expanded Distribution sales.

A durable change

What print-on-demand has accomplished is to lower the cost of keeping a book available, and that shift changes the economics of small titles and backlist titles alike. KDP's published terms make the model transparent enough for authors to judge it on the numbers.

Authors exploring the platform can Explore KDP Publishing Options.

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