BISAC Codes and KDP in 2026: What Authors Still Need to Know
BISAC remains an important North American book-industry subject standard, but KDP authors now choose Amazon categories directly. Learn where BISAC still matters and where it does not.
BISAC is the Book Industry Study Group’s subject-heading standard for classifying books by content. It is still used across the North American book trade, including by retailers, distributors, publishers, and bibliographic services.
KDP’s current publishing interface, however, asks authors to choose up to three Amazon categories based on the book’s primary marketplace and audience. That means the practical KDP task is selecting accurate Amazon categories, not reverse-engineering a BISAC-to-Amazon mapping.
What BISAC Codes Are
BISAC subject headings are standardized codes and descriptions used to communicate what a book is about. BISG describes them as a US standard used throughout the supply chain and says they can influence shelving in physical stores or subject discovery in internal databases. The current official list is maintained and revised by BISG.
If you need the actual subject list, use the current BISAC Subject Codes rather than copying codes from an old blog post. BISG releases new editions over time, so a code that once existed can be renamed, replaced, or retired.
What Changed for KDP Authors
KDP moved to direct category selection in 2023. In the current workflow, you choose categories from Amazon’s own list during title setup or editing. KDP says the list depends on the primary audience and primary marketplace, and you can select up to three categories.
That change removed the old practical habit of treating two BISAC choices as the front door to Amazon category placement. If your goal is Amazon discoverability, work with the current KDP category interface and verify what Amazon actually displays after publication.
Where BISAC Still Matters
BISAC still matters when your metadata travels through the wider book trade. If you use another distributor, an ISBN metadata service, a wholesaler, or an industry ONIX feed, subject classification may still require BISAC or a mapped standard such as Thema. In that environment, accurate subject coding helps trading partners understand and route the book.
The key is to assign codes for the book’s real subject, not to use BISAC as a secret marketing lever. BISG’s own guidance emphasizes content-based classification, and its usage notes distinguish closely related subjects when audience or treatment changes.
Does Amazon Still Use BISAC?
BISG lists Amazon among the organizations that use BISAC headings in a variety of ways. That does not mean KDP authors can choose a BISAC code and force a specific Amazon browse placement. Amazon’s customer-facing categories are its own taxonomy, and KDP gives authors a direct category selector.
Amazon-Only Publishing vs Wide Distribution
If KDP is your only distribution route, spend most of your energy on Amazon’s current categories, keywords, description, and audience metadata. BISAC knowledge is useful background, but it should not displace the work that readers actually encounter in the Amazon store.
If you distribute widely, keep a separate metadata record for each edition that includes the current BISAC subjects requested by your distribution partners. This makes your metadata portable and reduces the temptation to force one retailer’s taxonomy onto every other platform.
How to Choose BISAC Subjects Well
- Start with the book’s central subject or genre, not the easiest-looking commercial label.
- Use the most specific current heading that genuinely describes the content.
- Add secondary subjects only when they represent meaningful additional content.
- Check the current BISG edition instead of relying on archived code lists.
- Keep audience, language, format, and merchandising themes in their appropriate metadata fields rather than trying to encode everything in BISAC.
How BISAC and KDP Categories Should Work Together
Treat the two systems as parallel descriptions of the same book. A historical mystery might receive an accurate BISAC fiction subject for industry distribution while also receiving three relevant Amazon category selections in KDP. The labels may not match word for word, but the positioning should tell a coherent story about genre, subject, and audience.
If your BISAC record says one thing while your Amazon categories and description say another, the problem is not an algorithmic “signal conflict.” It is a metadata-quality problem that can confuse retailers and readers. Fix the classification at the source.
A Practical BISAC-to-KDP Workflow
Use BISAC early in the publishing process as a language and classification check, especially if the book will also move through distributors, wholesalers, libraries, or non-Amazon retailers. Start by identifying the most accurate current BISAC heading for the book’s central content, then write down the plain-English subject, audience, and use case that led you there. That record remains useful even if Amazon presents different labels in its category selector.
When you reach KDP, begin again with Amazon’s current category tree rather than trying to translate the BISAC code mechanically. Search for the closest reader-facing category paths, compare them with similar books, and select up to three accurate choices. If the BISAC heading and KDP category appear to point in different directions, revisit the positioning brief. The mismatch may reveal that one of the classifications is too broad, too narrow, or based on a secondary theme rather than the book’s main subject.
Frequently Asked Questions
How many KDP categories can I choose?
KDP currently allows up to three categories during title setup or editing. The available choices depend on the book’s primary audience, primary marketplace, and format.
Do I need to enter BISAC codes in KDP?
Not in the current KDP category-selection workflow. You choose Amazon categories directly. BISAC may still be required by other distribution or metadata partners.
Is BISAC obsolete?
No. BISG continues to maintain BISAC and describes it as a major North American industry standard. It is simply not the same thing as choosing categories in the KDP dashboard.
Can a BISAC code guarantee an Amazon category?
No. Do not treat BISAC as a guaranteed mapping mechanism for Amazon browse placement.
What if I publish internationally?
BISAC is primarily a North American standard. International workflows increasingly use standards such as Thema, and distribution partners may map between systems.
Use BISAC for Industry Metadata and KDP Categories for Amazon
For an Amazon-only author, the actionable category decision happens in KDP. For a publisher distributing through multiple channels, BISAC remains an important metadata standard. Keeping those jobs separate makes both systems easier to use correctly.
Research the Amazon side separately
Use the free Category Finder for Amazon category paths, then use deeper Category Research when you want directional competition evidence.
