Self-publishing in 2026 is bigger than ever by volume and steadily larger by money, but the typical indie author still earns modestly. Bowker counted 3,529,980 self-published ISBNs in the US in 2025, the KDP Select Global Fund paid out roughly $700 million across 2025 by our sum of Amazon's monthly figures, and author surveys put median indie income somewhere between "under $100 a month" and $13,500 a year depending on who is counted.
This report pulls together the numbers that are actually published, says how each was gathered, and flags where the data is thin or self-reported. Every figure links to the page that states it.
How big is self-publishing in 2026?
The best available count of US book output comes from Bowker, the ISBN agency. In its 2025 data, reported by Publishers Weekly in March 2026, self-published ISBNs "soared 38.7% to more than 3.5 million from 2.5 million in 2024." Traditionally published titles rose 6.6%, to 642,242. On those counts, by our arithmetic (3,529,980 ÷ 642,242), self-published ISBNs outnumbered traditional ones by roughly 5.5 to 1.
A flat three years, then a 38.7% jump in 2025. Each format needs its own ISBN, so this is a count of ISBNs, not books.
Read that chart carefully, because an ISBN count is not a book count.
- Formats multiply ISBNs. Amazon's own ISBN help page says "Each format of your book (paperback vs hardcover) needs its own ISBN." Bowker's Andrew Kovacs told Publishers Weekly that the ease of publishing the same title in several formats, each needing its own number, is one reason for the 2025 jump.
- Kindle ebooks can skip ISBNs entirely. The same KDP page says ebooks and low-content books "are the only formats where an ISBN is optional." Publishers Weekly notes that most self-published titles in the top genres are e-books. Our inference: any KDP ebook published without an ISBN cannot appear in Bowker's count at all.
- Not every ISBN is a novel. The self-published total includes titles without subject (BISAC) codes, which can mean anything from journals to workbooks.
So the honest summary is this: the count of registered self-published products jumped in 2025, and the real number of indie ebooks is higher and unknown. Nobody outside Amazon publishes a reliable count of KDP titles.
The Kindle money: what Amazon actually pays out
Amazon publishes one hard number every month: the size of the KDP Select Global Fund, the pot that pays authors for Kindle Unlimited page reads. Written Word Media keeps a running list of every monthly figure back to 2014. We added up each calendar year.
Our sums of Amazon's monthly fund announcements as compiled by Written Word Media. The pot has grown every year since 2021.
The 2025 fund came to $699.9 million by our sum, up from $644.6 million in 2024. The first nine months of 2026 (January to September) total $584.1 million, against $519.0 million for the same months of 2025, a gain of about 12.5%. July 2026 set the monthly record at $67.6 million.
Two cautions. First, the fund is shared by everyone in KDP Select, so a bigger pot does not mean a bigger check for you. Your share depends on pages read across the whole program. Second, Amazon's banner figure is a different number. The KDP Select page shows "Total KDP Select Author Earnings" of $69.3 million for September 2026, which is larger than the $65.9 million fund that month. Amazon doesn't break that banner down on the page, so don't treat it as the fund size.
What a page read is worth
Written Word Media, which calculates the US per-page rate (KENP) itself from Amazon's figures, lists it at $0.005365 for September 2026, up from $0.004521 in September 2025. As a worked example, a reader who borrows and finishes a novel with 400 KENP pages would earn its author 400 × $0.005365 = $2.15 at the September 2026 rate. The rate moves every month, so treat that as a snapshot, not a planning number. Our post on Kindle Unlimited vs going wide covers the trade-off of exclusivity.
Kindle Unlimited is now Kindle+
On October 22, 2026, Amazon announced in the KDP Community that it was "rebranding Kindle Unlimited to Kindle+" and adding audiobooks for customers on Amazon.com. The details matter for indie authors:
- Audiobooks made with KDP's virtual voice tool are included automatically when the ebook is in KDP Select.
- ACX audiobooks can be enrolled if they have exclusive Audible distribution and Whispersync for Voice. At launch only Pay for Production titles qualify, not Royalty Share.
- Listening is "paid the same way, by page," and Amazon says it is "adding funds to the KDP Select Global Fund" to cover it.
- Audiobooks in Kindle+ are available to US listeners only for now.
Our read: Global Fund figures from October 2026 onward will not be directly comparable with earlier months, because the pot now pays for listening as well as reading.
How indie authors actually earn
Income is where the data gets thinnest. There is no government or retailer dataset on author earnings, so everything comes from surveys that authors choose to answer. Here are the three best-known, side by side.
Written Word Media (2025). The 2025 Indie Author Survey had 1,346 responses. It found that 44% of authors earn $100 a month or less, 13% earn over $5,000 a month, and 8% report over $10,000 a month. The company is upfront that "The survey skews toward serious, prolific indie authors" and that income is self-reported.
The patterns behind those brackets are the useful part:
- Catalog size. About 80% of authors with one to three books sit in the under-$100 band. Authors with 25 or more books report a median of about $3,000 a month.
- Email lists. Average list size runs from 902 subscribers for the under-$100 group to 18,327 for authors earning over $10,000 a month.
- Marketing spend. The under-$100 group spends about $81 a month on marketing; the top group spends about $4,500.
- Retailer reliance. 83% named Amazon as their top revenue source, down from 91% in 2023 and 87% in 2024.
ALLi (2025). The Alliance of Independent Authors screens for authors who spend more than half their working time on writing and publishing. Its 2025 report drew 1,520 qualified responses, and ALLi's facts page gives the "median self-published author income was $13,500," growing about 6% year on year. The same report notes the average respondent had published about 14 books.
Authors Guild (2023 survey, 2022 income). The Guild's income survey of 5,699 published authors found that "The median income of full-time self-published authors in 2022 was $12,800 from books." Full-time self-published authors who had been publishing since at least 2018 reported a $24,000 median, up from $13,700 in 2018. It is the oldest of the three surveys and describes 2022 income.
The surveys disagree less than they seem to. They count different people. Put together, they say an indie author with a handful of books and no list should expect hobby income, and an author treating it as a full-time business with a deep backlist can reach a modest professional wage. A large catalog, ideally in series, is one of the strongest correlates of income in both the Written Word Media and ALLi data. If you are planning that series now, our guide to planning a book series is the place to start.
Print vs ebook vs audio
The Association of American Publishers' StatShot Annual Report, released in August 2026, put total US publishing revenue at $33.4 billion for 2025, up 2.5%. Trade (consumer) books rose 2.7% to an estimated $21.7 billion.
Print still dominates publisher revenue, but digital audio now out-earns ebooks.
The headline for indies is the digital split. Across the industry, "Digital Audio increased 5.3% to $2.5 billion in 2025," while "eBooks increased 3.2% to $2.2 billion." Audio is now the larger digital format by revenue. The first-quarter 2026 StatShot, a separate monthly report from about 1,400 publishers, widened the gap in trade: digital audio was up 15.9% to $302.3 million, while ebook revenues were down 5% to $261 million.
Fiction specifically tells the same story. In adult fiction for 2025, Publishers Weekly reported that "Digital audio had a solid year in the category with sales up 7.6%, while e-book sales were flat."
Why this needs a caveat. AAP figures are estimates built by an outside research firm from participating publishers' submissions and government statistics. The release lists "research concerning independent and self-publishing activity" among its reference points but does not say how much self-published revenue is captured. Our view is that much of what KDP pays authors is not counted as publisher revenue here. For indies, the AAP numbers describe where reader spending is heading, not what KDP pays.
Indie authors are already following the audio money. In Written Word Media's 2025 survey, 98% of authors publish ebooks, 97% paperbacks, 51% have at least one audiobook, and 36% offer hardcovers.
Audio royalties changed too
Audible moved ACX to a new royalty model in 2026. Exclusive titles earn 50% (against 40% on the legacy model) and non-exclusive titles 30% (against 25%). Membership listening is now paid from "Member Value," a member's plan price minus taxes and fees, split across the titles they listen to in proportion to each title's price. All creators could enroll existing titles from May 26, 2026, and ACX says "By end of year, the legacy royalty model will be discontinued." In Written Word Media's mid-year 2026 survey, authors in the $2,500 to $10,000 a month tier named the ACX change alongside the "A10" ranking change as a cause of falling income.
Genre: romance still leads, with a hangover
Circana BookScan tracks print unit sales at reporting retailers. For 2025, Publishers Weekly reported total print units of 762.4 million, a 0.3% increase. "Sales in the romance category rose 3.9%, to almost 44 million units," led by Rebecca Yarros's Onyx Storm. Fantasy went the other way: "fantasy sales fell 8.7%, to 24.1 million."
Two things are worth knowing before you chase those numbers.
- Romantasy numbers are inferred. PW notes that "BookScan doesn't have a romantasy category," so any single romantasy figure you see is someone's estimate. One blockbuster can swing both.
- 2026 is lapping a monster. In the first quarter of 2026, romance print sales "plunged 25.4%," which PW attributes largely to Onyx Storm's 2025 launch. That is a comparison effect, not proof readers have left.
For indie authors, the self-published side is clearer. In Written Word Media's 2025 survey, romance writers were 21% of all respondents but about 44% of those earning over $10,000 a month. Paranormal romance and cozy mystery also over-indexed among higher earners, while children's, literary fiction and religious nonfiction clustered in the lower brackets. That reflects what sells through indie channels, not what is worth writing. If you are choosing a lane, our genre hub and guide to finding comp titles help you check where your book fits.
Discoverability: where readers find books now
The most direct evidence comes from readers themselves. Written Word Media's 2026 Reader Survey asked 3,589 readers where they most often find new books.
Amazon and email newsletters lead. AI chat tools barely register. Respondents are Written Word Media newsletter readers, so email is flattered.
Two caveats sit inside that chart. These are Written Word Media's own newsletter subscribers, so email is overstated. And the survey skews to heavy digital readers who buy free and discounted books. Even so, the near-zero figure for AI tools is striking: 71% said they don't use ChatGPT or Gemini to find books, and fewer than 1% use them regularly.
BookTok and social media
BookTok is the hardest discovery channel to measure. Publishers Weekly credits adult fiction's post-pandemic strength partly to "the emergence of BookTok," but we could not find a full-year 2025 US figure for BookTok-driven sales from Circana or any other primary source. Treat any precise BookTok sales claim you see with suspicion unless it links to one.
What we can measure is what authors are doing. BookBub's survey of more than 850 authors found 62% used Facebook at least weekly, 51% Instagram, 21% Bluesky and 13% TikTok. Bluesky showed the biggest planned increase, with 8% more authors expecting to use it weekly.
Amazon's algorithm shift
Many indie authors spent 2026 talking about a change in how Amazon ranks books. "A10" is the industry's label for it, not a name Amazon has announced. Written Word Media's March 2026 podcast episode on the A10 update argued that external traffic (email, social, promo sites) now counts for more than Amazon ads, and that steady sales across several days beat a one-day spike. Amazon has not published how its ranking works, so treat those as practitioner observations.
The effect showed up in sentiment. In Written Word Media's mid-year 2026 survey of 582 authors, 23% said their business was growing, 22% holding steady and 30% declining. Decline was worst in the $2,500 to $10,000 a month tier, at 36%. Yet 51% expected income to grow over the next 12 months. Growing authors were far more likely to be writing faster (64% vs 36% of all respondents) and using a newsletter (58% vs 43%). KDP Select vs wide made no difference to optimism: 46% exclusive against 47% wide.
What changed in 2025 and 2026
Pulling the threads together, these are the shifts with real dates and sources behind them:
- November 2025: Amazon launched Kindle Translate, a free AI translation beta for KDP authors. An update on June 30, 2026 added French, Italian and Portuguese, so it now covers English with Spanish, German, French, Italian and Portuguese. Translated titles can be enrolled in KDP Select.
- March 2026: Bowker's 2025 count showed the 38.7% jump in self-published ISBNs.
- March to June 2026: Written Word Media covered what the industry calls Amazon's "A10" ranking change in March; by its June survey, authors were naming it as a main cause of falling sales. Amazon has not confirmed the change publicly.
- May 26, 2026: All ACX creators could move existing titles to Audible's new royalty model; the legacy model ends by the end of 2026.
- August 2026: AAP confirmed digital audio out-earned ebooks for 2025.
- September 21, 2026: KDP limited new titles to two per format per week, with a matching weekly submission limit from October 5.
- October 22, 2026: Kindle Unlimited became Kindle+ and added audiobooks for US subscribers.
The AI side of these changes (disclosure rules, lawsuits, AI narration and translation) is covered in our companion report, AI in publishing in 2026.
What this means if you're planning 2027
The data does not hand anyone a formula. It does point the same way from several directions at once.
Here is what we would do on Monday, based on the evidence above:
- Count your catalog honestly. If you have one to three books, the surveys say income comes from writing the next one, ideally in the same series. Both the Written Word Media and ALLi data tie earnings to catalog size.
- Start or clean up your email list. Written Word Media called list size "one of the sharpest correlations in the entire survey" in 2025, and growing authors in its 2026 mid-year survey used newsletters far more than average (58% vs 43%). One reader magnet and one welcome sequence is enough to begin.
- Price and package before you advertise. Written Word Media's authors ranked the cover as the top factor in selling a book, yet spending $2,000 or more on one showed no clear link to higher income. A sharp blurb costs nothing but time, and our ebook pricing guide walks through the 35% and 70% royalty bands.
- Decide your audio path before the year ends. If you have ACX titles on the legacy model, they need to move to the new model or come down. If your ebook is in KDP Select and you have access to virtual voice, Kindle+ now pays for listening too. Weigh that against the human-narration preference readers report: over 80% of Written Word Media's 2026 readers said they prefer human narrators.
- Run one controlled test, not five. Mid-year survey authors who were growing used promo sites, Meta ads and Amazon ads. Pick one, set a budget you can afford to lose, and track it for 90 days.
- Keep your series straight as it grows. Series read-through is where the surveys find the money, and a series is where continuity slips pile up. A story bible, in a spreadsheet or a tool, keeps names, timelines and rules consistent from book one to book seven.
What the data can't tell you
No public source gives the number of active KDP authors, the median KDP income, or total Kindle ebook sales. Amazon doesn't publish them. Every income figure in this report is self-reported by authors who chose to answer a survey, and those authors skew toward the committed and the successful. When you read "indie authors earn X," ask who was asked.