Indie Author School / Resources
ISBNs for self-published authors in the UK and US: when you need one and what it costs
Ebooks on Amazon need no ISBN, paperbacks do. Nielsen charges £93 for one and £174 for ten, Bowker $125 and $295. KDP's free ISBN works only on KDP.
If you publish an ebook on Amazon you do not need an ISBN. KDP Help says an ISBN is optional for ebooks and low-content books, and Amazon gives every Kindle book its own ASIN instead. If you publish a paperback or hardback you do need one, and you have two choices: take the free ISBN KDP offers, which names "Independently published" as the imprint and works only on KDP, or buy your own from your national agency and put your own imprint name on the book.
As of 1 November 2026, the UK agency Nielsen charges £93 for a single ISBN and £174 for a block of ten, with VAT included. The US agency Bowker charges $125 for one and $295 for ten.
When you need an ISBN and when you do not
An ISBN identifies one tradeable product, which means one edition of one format from one publisher. The International ISBN Agency's users' manual says a hardback, a paperback, an audiobook and an ebook of the same book each need their own number, and Nielsen's notes for publishers say the same: a different ISBN must be assigned to each separately tradeable product. KDP Help puts it the same way for its own store. The same ISBN cannot be reused across formats or for a new edition with significant changes.
- A Kindle ebook on KDP does not need one. Amazon assigns an ASIN and many authors leave the ISBN field blank.
- A paperback or hardback on KDP needs one, either free from KDP or your own.
- A paperback through IngramSpark or another printer for bookshop distribution needs one, and it has to be your own, because KDP's free ISBN cannot be used outside KDP.
- A new edition with substantial revisions, or a change of title or subtitle, needs a new ISBN. The ISBN manual and Nielsen both say so.
- A reprint with corrected typos, a new cover or a new price, keeps the same ISBN. The manual says cosmetic changes and minor corrections do not need a new number.
So a novel sold as ebook, paperback and hardback uses two ISBNs if you skip the ebook number and three if you give the ebook one too. A three-book series in paperback and hardback needs six. That arithmetic is why many authors buy the block of ten.
Free KDP ISBN or your own
KDP Help is clear about the trade. With a free KDP ISBN the imprint on your book's listing reads "Independently published", the number belongs to Amazon, and it cannot be used to publish the same book anywhere else. With your own ISBN you can list your own business or brand name as the imprint, KDP checks that name against the ISBN agency's record, and you have to enter the same title, author and publisher in KDP that you registered with the agency.
If you only ever intend to sell the paperback on Amazon, the free number does the job. If you want the same paperback in bookshops through IngramSpark, want your own imprint name on the copyright page, or want the ISBN record to stay yours if you move printers, buy your own. You can also mix: a free KDP ISBN on the Amazon paperback and your own ISBN on an IngramSpark edition, because they are different products from different publishers.
What ISBNs cost in November 2026
We read the Nielsen ISBN Store price page on 1 November 2026. Nielsen's prices include UK VAT at the standard rate. Bowker's MyIdentifiers site blocked our automated reading, so the US figures below are the ones its self-publisher price page returns in search results, matched by two guides updated in August 2026 (BookSpace and Books.by). Check the Bowker page yourself before you pay.
| Quantity | Nielsen (UK and Ireland), incl. VAT | Bowker (US) |
|---|---|---|
| 1 ISBN | £93.00 | $125.00 |
| 10 ISBNs | £174.00 | $295.00 |
| 100 ISBNs | £387.00 | $575.00 |
| 1,000 ISBNs | £994.00 | $1,500.00 |
| Barcode | £15.00 each, or 10 for £79.99 | Sold separately; guides quote $25 each, which we could not confirm on Bowker's site |
The block of ten is the number that matters. In the UK, four single ISBNs cost £372 and a block of ten costs £174, so the block is cheaper from the second book onwards. In the US, four singles cost $500 against $295 for ten. Nielsen asks you to email its agency for quantities above 1,000.
You buy from the agency for the country where your publishing business is based, not where you sell. A UK author selling mostly to US readers still buys from Nielsen. The International ISBN Agency lists the agency for every other country.
Barcodes
A barcode is the ISBN drawn as lines that a till can scan. Nielsen's notes say most bookshops use it for stock and some cannot sell a book without one, and that it belongs in the bottom right corner of the back cover. You do not need to buy one for a KDP paperback: KDP Help says that if you do not provide a barcode it places one on the back cover for you, and its cover template leaves a barcode margin for it. Buy a barcode only if a printer or distributor asks for a file, or generate one yourself from the ISBN, which is what the free generators do.
After you buy
- Register the title with the agency. Nielsen asks you to register for its free Title Editor after buying, and its notes say registration can take up to ten days and that bookshops want the record about 20 weeks before publication. The record is what puts your book in the UK trade database that bookshops and libraries order from.
- Decide the imprint name now. It has to match on the ISBN record, the copyright page and the KDP or IngramSpark book setup.
- Put the ISBN on the copyright page and the back cover, and give each format its own number.
- Keep a spreadsheet of which number went to which edition. The agency will not do that for you, and a block of ten lasts years.
- In the UK and Ireland, send one copy of the printed book to the British Library within a month of publication. Our legal deposit article gives the address and steps.
The ISBN is one of the smaller costs of a book, and our cost breakdown puts it next to editing and cover design. If you later sell the paperback from your own author page as well as on Amazon, the same ISBN goes on the listing there; nothing about a direct sale needs a new number.
Sources: Nielsen ISBN Store prices and barcode prices, Nielsen's notes for publishers, Bowker MyIdentifiers, KDP Help on ISBNs, KDP Help on paperback covers and the International ISBN Agency.
Questions, answered
Do I need an ISBN to publish an ebook on Amazon KDP?
No. KDP Help says an ISBN is optional for ebooks and for low-content books, and Amazon gives every Kindle book an ASIN of its own. Many self-published authors leave the field blank. If you do want one on the ebook, perhaps because you sell it wide and want one record across stores, it must be a different number from the paperback.
Is the free KDP ISBN worth taking?
It is if the paperback will only ever be sold on Amazon. The imprint shows as "Independently published", the number cannot be used outside KDP, and the record belongs to Amazon. If you want your own imprint name, want to print the same edition through IngramSpark for bookshops, or want to keep the record if you change printer, buy your own.
How much does an ISBN cost in the UK?
As of 1 November 2026 the Nielsen ISBN Store charges £93 for a single ISBN, £174 for a block of ten, £387 for 100 and £994 for 1,000, all including VAT. A barcode is £15, or £79.99 for ten. Four singles cost more than twice the block of ten, so the block is the better buy for more than one format.
How much does an ISBN cost in the US?
Bowker, through MyIdentifiers, charges $125 for one ISBN, $295 for ten, $575 for 100 and $1,500 for 1,000, according to its self-publisher price page as returned in search results and to guides updated in August 2026. Bowker sells barcodes separately. We could not read Bowker's own pages directly, so confirm the figures there before buying.
Do I need a new ISBN if I fix typos or change the cover?
No. The International ISBN Agency's users' manual says minor corrections, a new cover and a new price do not need a new number. You do need a new ISBN for a new format, for a substantially revised edition, or if the title or subtitle changes. Nielsen's notes say the same and tell you to contact the agency if you are in doubt.
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