September 15, 2026

KDP Self-Publishing on Amazon: 2026 Glossary & Guide

Master KDP Self Publishing Amazon terms in this 2026 glossary: royalties, printing costs, KU, metadata, pricing. Learn fast and publish smarter.

TL;DR

Kindle Direct Publishing (KDP) is Amazon’s free self-publishing platform where authors upload ebooks, paperbacks, and hardcovers without needing a publisher. You keep your rights, set your own prices, and earn royalties on every sale. This glossary covers every term you’ll encounter when self-publishing on Amazon KDP, organized by the stage of the publishing process where you’ll actually need it, with current royalty rates, printing costs, and real-world advice from practicing authors.

Why This Glossary Exists

KDP self publishing on Amazon sounds simple until you’re staring at a dashboard asking for BISAC codes, KENP projections, and royalty tier selections. The platform is free to use, but the terminology can stop a first-time author cold.

This glossary is organized by your publishing workflow, not alphabetically. You’ll encounter each term in roughly the order it matters: account setup first, then metadata, formats, pricing, distribution, and marketing. If you want the full walkthrough, our step-by-step KDP publishing guide covers the process from manuscript to live listing.

Every definition below includes enough context to help you make actual decisions, not just understand a word.

Platform and Account Setup

These are the foundational terms you’ll hit before you ever upload a manuscript.

Kindle Direct Publishing (KDP)

Amazon’s self-publishing platform. It lets authors and publishers distribute ebooks, print-on-demand paperbacks, and hardcovers directly to Amazon customers worldwide. KDP launched in 2007 alongside the original Kindle e-reader, and it has since become the dominant channel for indie authors. When people say “Amazon self publishing,” they mean KDP.

There are no upfront fees. No application process. No gatekeeper deciding whether your book is worthy. You upload, you publish, you earn royalties.

KDP Account

Creating one is free and takes about ten minutes. You’ll need your tax information (a W-9 if you’re a US author, a W-8BEN if you’re international) and bank details for royalty deposits. Amazon pays royalties roughly 60 days after the end of each month.

For a detailed walkthrough of the setup process, including tax compliance steps, see our KDP account setup guide.

Author Central

A separate, free Amazon service that gives you control over your author profile and book listings. You can add a biography, photos, blog feeds, and editorial reviews. Many new authors don’t realize Author Central exists because it lives outside the KDP dashboard. You access it at author.amazon.com after your first book goes live.

Imprint Name

The publisher name that appears on your Amazon listing and copyright page. If you use KDP’s free ISBN, your imprint automatically reads “Independently published.” Buying your own ISBN through Bowker lets you use any imprint name you want, which matters if you’re building a publishing brand or want to avoid the “indie” label on bookstore shelves.

Book Details and Metadata

Metadata is the invisible infrastructure that determines whether readers find your book or never see it. Get this section right and your book has a fighting chance. Get it wrong and even a great book disappears.

ASIN (Amazon Standard Identification Number)

A 10-character alphanumeric code Amazon assigns to every product in its catalog, including your book. For ebooks published on KDP, the ASIN is your primary identifier. You don’t need an ISBN for a Kindle ebook because the ASIN handles identification within Amazon’s ecosystem.

ISBN (International Standard Book Number)

The global standard for identifying books. Required for print books on most platforms. KDP offers a free ISBN for paperbacks and hardcovers, but using it locks your imprint as “Independently published” and limits your distribution options. Purchasing your own through Bowker gives you full control. Our ISBN guide for self-publishers breaks down when the free option is fine and when it isn’t.

Common confusion: An ASIN and an ISBN are not interchangeable. ASINs exist only within Amazon. ISBNs are universal. Your print book will have both.

BISAC Codes

BISAC (Book Industry Standards and Communications) codes tell retailers, libraries, and search engines what genre your book falls into. When publishing on KDP, you can select up to three categories for your book. Picking the right ones is critical because they determine which bestseller lists you’re eligible for and which browse pages surface your title.

Keywords (KDP Keyword Slots)

KDP gives you seven keyword slots with up to 500 characters total. These keywords aren’t visible to readers but directly affect how your book appears in Amazon search results. Practitioners on Reddit consistently call this the most neglected field in KDP publishing. Many authors leave slots blank or stuff them with single words when they should be using specific, multi-word phrases that match how readers actually search.

Book Description (Blurb)

The sales copy on your Amazon product page. This is where browsers become buyers. A common mistake is treating the description as a plot summary. It’s not. It’s a sales pitch.

Experienced self-publishers on Reddit stress a useful rule of thumb: study the blurbs of bestsellers in your genre and model yours after their structure. The description sells your book more than anything except the cover.

Book Formats on KDP

KDP supports three formats. Each one is uploaded separately, gets its own product listing, and has its own pricing.

Kindle eBook

A digital file with no printing, no inventory, and the ability to update your content after publication. This is the fastest format to publish and the one with the highest margin on most price points.

Paperback (Print-on-Demand)

Printed only when a customer orders a copy. Amazon handles printing and shipping, then deducts the printing cost from your royalty. You never buy stock, never manage inventory, and never ship a package. For a comparison of print formats and their economics, see our hardback vs. paperback guide.

Hardcover

Same print-on-demand model as paperback but with a higher unit printing cost and a higher customer price point. KDP added hardcover printing in 2022. The fixed printing cost for a hardcover is $5.65 compared to $1.00 for a standard paperback, so pricing strategy matters more here.

ePub

The file format used to create ebooks. KDP accepts both Word (.docx) and ePub uploads, then converts the file to its proprietary Kindle format internally. If you want more control over how your ebook looks, uploading a properly formatted ePub is the better path. Our Kindle formatting glossary covers the specifics.

Fixed-Layout ePub

A special ePub format where text and images stay in fixed positions on the page. Readers zoom in and out instead of adjusting font size. Used for children’s books, cookbooks, art books, comics, and anything else where layout matters as much as content.

Trim Size

The finished dimensions of your printed book. The most popular and cost-effective options are 5"×8", 5.5"×8.5", and 6"×9". These standard sizes have the lowest per-page printing costs and work well for most genres. Choosing an unusual trim size can increase your costs significantly.

Bleed

The area of a print book’s cover or interior that extends beyond the trim line. If any image or colored background reaches the edge of a page, you need bleed settings enabled. This is one of the most common rejection reasons for new authors uploading print files to KDP. Amazon’s print specs require 0.125" of bleed on all sides.

Pricing, Royalties, and Printing Costs

This is where KDP self publishing on Amazon gets mathematical. Understanding these numbers is non-negotiable if you want to price profitably.

eBook Royalty Rates: 35% vs. 70%

For every Kindle ebook, you choose one of two royalty options:

70% royalty: Available for books priced between $2.99 and $9.99. A delivery cost (based on file size) is subtracted.
35% royalty: Applies to books priced from $0.99 to $2.98 or from $9.99 to $200. No delivery cost subtracted.

The 70% tier is where most authors want to be, but it comes with a price floor of $2.99. Books priced at $0.99 or $1.99 automatically fall to the 35% tier.

Print Royalty Rates: 50% vs. 60% (Post-June 2025)

As of June 10, 2025, Amazon changed its royalty structure for print books. This is a significant shift that many resources haven’t caught up with yet:

Books priced at $9.99 USD or above on Amazon.com earn a 60% royalty (list price minus printing cost).
Books priced at $9.98 USD or below earn a reduced 50% royalty.

If you’re publishing paperbacks through KDP and pricing them under $9.99, your effective royalty dropped by a meaningful percentage. This makes pricing strategy for print books more important than ever.

Explore our full cost breakdown for a wider look at where your money goes when self-publishing.

Printing Cost Formula

KDP calculates your printing cost with a simple formula:

Fixed cost + (page count × per-page cost) = printing cost

For a 300-page paperback in black ink with a standard trim size: $1.00 + (300 × $0.012) = $4.60

For a 300-page hardcover in black ink: $5.65 + (300 × $0.012) = $9.25

Color printing costs significantly more per page. Always check the KDP printing cost calculator before setting your price.

Worked Royalty Example

Say you price a 300-page paperback at $14.99 on Amazon.com:

List price: $14.99
Royalty rate: 60% (because it’s above $9.99)
Royalty before printing: $14.99 × 0.60 = $8.99
Printing cost: $4.60
Your royalty: $4.39 per copy

Now price that same book at $9.98:

Royalty rate drops to 50%
Royalty before printing: $9.98 × 0.50 = $4.99
Printing cost: $4.60
Your royalty: $0.39 per copy

That one-penny difference between $9.98 and $9.99 costs you over $4 per sale. Pricing matters.

eBook Delivery Cost

When you select the 70% royalty option, Amazon subtracts a delivery cost based on your ebook’s file size. In the US marketplace, this is $0.15 per megabyte. A text-only novel might be 2-3 MB ($0.30-$0.45 deducted). An image-heavy book could be 10+ MB, which eats into your royalty significantly.

Minimum List Price

KDP won’t let you set a price below the point where your royalty would go negative. The system calculates the minimum based on your printing cost and the applicable royalty rate. For print books, this floor can be surprisingly high, especially for longer books or hardcovers.

KDP Select and Kindle Unlimited

This is the biggest strategic decision most KDP authors face: exclusivity or freedom.

KDP Select

An optional Amazon program that requires your ebook to be sold exclusively on Amazon for a minimum of 90 days (auto-renewing). In exchange, you get access to Kindle Unlimited readers, Kindle Countdown Deals, and Free Book Promotions. Only ebooks are affected. You can still sell your paperback and hardcover anywhere.

Kindle Unlimited (KU)

Amazon’s subscription reading service. Readers pay a monthly fee for unlimited access to books enrolled in KDP Select. Authors earn money based on pages read, not books borrowed. This distinction matters because a reader who downloads your book but never opens it earns you nothing.

KENP (Kindle Edition Normalized Pages)

Amazon’s standardized page measurement system for Kindle Unlimited. When a KU subscriber reads your book, your payment is calculated per normalized page read. Amazon normalizes page counts across all books to a standard format, ensuring that large fonts or wide margins don’t inflate earnings artificially.

KENP Rate and the Global Fund

Each month, Amazon allocates a global fund for KDP Select author payments. This fund reached $66.9 million in May 2026. The per-page rate fluctuates monthly based on the fund size divided by total pages read across all enrolled books. The rate averaged about $0.00445 per page in 2025 and sat near $0.004888 in May 2026.

What does that mean in real money? A fully read 300-page novel earns roughly $1.35 to $1.45. A 500-page novel earns roughly $2.25 to $2.45. These are modest numbers per read-through, but they compound with volume.

Kindle Countdown Deal

A promotional tool exclusive to KDP Select. You temporarily reduce your ebook price with a visible countdown timer on the product page, creating urgency. The key benefit: you still earn the 70% royalty rate during the promotion, even if the discounted price would normally qualify only for 35%.

Free Book Promotion

Another KDP Select perk. You can make your ebook free for up to 5 days per 90-day enrollment period. The primary use case is driving downloads, generating reviews, and building read-through momentum for a series. You earn nothing on free downloads directly, but the downstream effects on visibility and series sales can be substantial.

Exclusive vs. Wide: What Practitioners Actually Report

The exclusive-vs-wide debate generates enormous discussion in author communities. The practitioner consensus on Reddit is fairly consistent: KDP Select works best for romance, fantasy, and thriller series where Kindle Unlimited readership is heavy. Going wide (publishing on Apple Books, Kobo, Barnes & Noble, Google Play, and others) tends to work better for non-fiction, literary fiction, and higher-priced books above $6.99.

If you’re considering multi-platform distribution, our guide to publishing on Amazon and other platforms covers the practical steps.

Distribution

How your book gets from KDP to readers, and what happens when you want to sell beyond Amazon.

Print-on-Demand (POD)

The production model that makes KDP self publishing on Amazon viable for individual authors. There’s no minimum order, no warehouse, no upfront inventory cost. A customer clicks “buy,” and Amazon prints a single copy, ships it, and deposits your royalty. This eliminates the financial risk that kept self-publishing out of reach for decades.

Wide Distribution (Going Wide)

Publishing on multiple platforms instead of staying exclusive to Amazon. Wide distribution doesn’t require exclusivity to any single retailer, giving you the freedom to sell through Amazon, Apple Books, Kobo, Barnes & Noble, Google Play, and library aggregators simultaneously. The trade-off is losing KDP Select benefits, particularly Kindle Unlimited income.

Expanded Distribution

KDP’s built-in option to make your paperback available through non-Amazon retailers and wholesalers. On paper, this sounds like an easy way to go wide. In practice, it has serious limitations.

Standard Amazon sales earn 60% of list price minus printing (for books $9.99+). Expanded Distribution sales earn only 40% minus printing, which often leaves almost nothing.

Here’s the critical detail many authors learn too late: Amazon’s Expanded Distribution offers retailers only a 25% discount and doesn’t allow returns. Bookstore owners cite this as the primary reason they refuse to stock KDP-printed books. On top of that, practitioners on Reddit report that checking the Expanded Distribution box can create conflicts if you later try to upload the same ISBN to IngramSpark, because Amazon has already claimed those distribution rights.

Bottom line: If you want physical bookstore placement, Expanded Distribution is not the path. You’ll need a separate relationship with IngramSpark or a distributor who offers standard trade terms.

Author Copies

Copies of your own book purchased at printing cost (no royalty added). Useful for events, signings, and giveaways. You order these through your KDP dashboard.

Marketing and Product Page Features

Publishing is only half the battle. These terms relate to making your book visible once it’s live on Amazon.

Amazon Advertising (AMS / Sponsored Products)

Amazon’s pay-per-click advertising system for books. Separate from KDP but tightly integrated with it. You bid on keywords or target specific competing books, and your ad appears in search results or on product pages. Amazon Advertising is the primary paid discovery channel for most KDP authors.

For a broader look at promotional strategy, see our book marketing glossary.

A+ Content

A free Amazon feature that lets you add image-and-text blocks (called modules) below your book description. The content appears in a “From the Publisher” section on your product page. Any author with a published KDP book can use it. You don’t need Brand Registry or KDP Select enrollment. This is one of the most underused free tools on the platform.

Look Inside

Amazon’s book preview feature. It automatically generates a sample from your uploaded manuscript, allowing shoppers to read the opening pages before buying. You can’t customize which pages appear, but you can ensure your opening chapter is polished enough to convert browsers into buyers.

Also Boughts (Customers Also Bought)

The algorithm-driven recommendation carousel on every product page. This drives significant passive discovery over time and is influenced by purchasing patterns. If readers who buy your book also buy books by a well-known author in your genre, your title starts appearing on that author’s product page. You can’t directly control this, but strategic Amazon Ads targeting can influence it.

Industry and Publishing Terms

A few broader terms that come up constantly in KDP self publishing discussions on Amazon forums and author communities.

ARC (Advance Reading Copy)

An early version of your book provided to reviewers before publication. ARCs are essential for generating launch-day reviews. Most authors distribute them digitally through services like BookFunnel or NetGalley. For launch planning details, check our book launch tips guide.

Vanity Press

A publisher that charges authors a fee to publish their books, often with little editorial support, poor distribution, and contracts that may claim rights to your work. Important to distinguish from legitimate assisted self-publishing, where the author retains full ownership and creative control. The key difference: a vanity press profits from the author’s payment, not from book sales.

Assisted Self-Publishing

A publishing model where authors hire professionals for editing, design, formatting, and distribution while keeping complete ownership of their work. The author pays for services upfront rather than giving up royalties or rights.

If you want professional support without giving up control, Alpaca Authors’ publishing packages cover editorial, cover design, ISBN setup, and distribution to 40+ platforms.

Real-World Insights From Practicing KDP Authors

Numbers and definitions only get you so far. Here’s what authors actually report from the trenches.

Pricing Strategy

New authors on Reddit consistently warn against pricing ebooks at $9.99 right out of the gate. The common advice: start at $2.99 to $3.99 to build initial traction, reviews, and algorithm momentum. You can raise prices once you have a backlist and a readership.

Series Momentum

One of the most repeated patterns across self-publishing forums: a single book rarely generates meaningful income, but a series changes the math entirely. Practitioners on Reddit describe the pattern clearly. One author shared that their first novel earned $143 total over eight months, but after publishing the second book in the series, monthly income jumped to $680.

The Email List

Authors who’ve published multiple books on KDP report the same regret with striking consistency: not building an email list sooner. Having a direct line to your readers means you don’t depend entirely on Amazon’s algorithm for every launch. Starting late means leaving money on the table with every previous release.

Cover Design Investment

Professional covers directly impact ad performance and sales velocity. Authors on Reddit report that an $800 investment in professional cover design and editing for a romance novel recouped within the second month, while a DIY-covered book in the same genre hadn’t earned that much after eighteen months.

Income Reality

Most KDP authors earn less than $500 per year. That’s the honest baseline. However, the ALLi 2025 survey found that authors with 25 or more published books earn a median of $3,000 per month. The message is clear: KDP self publishing on Amazon rewards persistence and catalog depth, not one-and-done publishing.

AI Content Enforcement

Amazon has been increasingly flagging AI-generated content. Authors on Reddit report account suspensions for books written entirely with ChatGPT or similar tools without substantial human editing. If you use AI tools in your writing process, significant human revision and original creative input are essential to staying compliant.

Quick Reference: A to Z Index

For fast lookup, here’s every term covered in this glossary in alphabetical order:

A+ Content (Marketing section)
Also Boughts (Marketing section)
ARC (Industry Terms section)
ASIN (Metadata section)
Assisted Self-Publishing (Industry Terms section)
Author Central (Account Setup section)
Author Copies (Distribution section)
BISAC Codes (Metadata section)
Bleed (Formats section)
Book Description / Blurb (Metadata section)
Categories (Metadata section)
Delivery Cost (Pricing section)
eBook Royalty Rates (Pricing section)
ePub (Formats section)
Expanded Distribution (Distribution section)
Fixed-Layout ePub (Formats section)
Free Book Promotion (KDP Select section)
Hardcover (Formats section)
Imprint Name (Account Setup section)
ISBN (Metadata section)
KDP (Account Setup section)
KDP Account (Account Setup section)
KDP Select (KDP Select section)
KENP (KDP Select section)
KENP Rate (KDP Select section)
Keywords (Metadata section)
Kindle Countdown Deal (KDP Select section)
Kindle eBook (Formats section)
Kindle Unlimited (KDP Select section)
Look Inside (Marketing section)
Minimum List Price (Pricing section)
Paperback (Formats section)
Print-on-Demand (Distribution section)
Print Royalty Rates (Pricing section)
Printing Cost Formula (Pricing section)
Trim Size (Formats section)
Vanity Press (Industry Terms section)
Wide Distribution (Distribution section)

Frequently Asked Questions

Is KDP self publishing on Amazon really free?

Yes. Creating an account, uploading files, and listing your book costs nothing. Amazon makes money by taking a percentage of each sale. You will likely spend money on editing, cover design, and marketing, but the platform itself charges no fees.

How much do KDP authors actually earn?

It varies enormously. About 75% of indie authors earn less than $1,000 per year. But authors with deep catalogs (25+ books) report median earnings around $3,000 per month. Income on KDP correlates strongly with the number of titles published and the consistency of new releases.

Should I enroll in KDP Select or go wide?

It depends on your genre and audience. KDP Select tends to pay better for genre fiction (romance, thriller, fantasy) where Kindle Unlimited readership is high. Non-fiction and literary fiction authors often do better going wide across multiple platforms. You can always start exclusive and go wide later, but you’re locked in for 90 days at a time.

What changed with KDP print royalties in June 2025?

Amazon reduced the royalty rate on paperback and hardcover books priced below $9.99 USD from 60% to 50%. Books priced at $9.99 and above still earn the 60% rate. This makes pricing print books above the $9.99 threshold significantly more profitable in most cases.

Do I need an ISBN for my Kindle ebook?

No. Amazon assigns an ASIN to every Kindle ebook, which serves as its identifier within the Amazon ecosystem. You only need an ISBN for print books, and even then, KDP offers a free one. The catch is that the free ISBN locks your imprint as “Independently published.”

Can I update my book after publishing on KDP?

Yes, for ebooks. You can upload a revised manuscript file at any time, and the updated version replaces the old one. For print books, you can also update interior files, but already-printed copies in transit won’t change. This flexibility is one of KDP’s genuine advantages.

Will Amazon ban my book if I use AI to write it?

Amazon requires authors to disclose AI-generated content and has been suspending accounts that upload low-quality, fully AI-written books. Using AI as a writing tool is different from having AI produce the entire book. Substantial human editing and original creative contribution are expected.

What’s the difference between KDP Expanded Distribution and IngramSpark?

KDP Expanded Distribution offers your paperback to non-Amazon retailers but provides only a 25% retailer discount with no returns, which means most bookstores won’t carry it. IngramSpark offers industry-standard trade discounts and a returnability option, making it the better path for physical bookstore distribution. Be aware that enabling Expanded Distribution on KDP can block you from uploading the same ISBN to IngramSpark.

Ready to move from terminology to action? Whether you need help with formatting, cover design, or getting your book distributed across 40+ platforms, explore Alpaca Authors’ publishing services to see how we can help you publish with confidence.