How to Co-Author a Book: A Practical Guide for Writers

Co-authoring a book can help you share the workload, combine ideas and expertise, reach new audiences, and potentially publish more consistently. But writing a book with someone else also introduces questions that solo authors rarely have to consider: Who makes the final decisions? Who owns the copyright? How should royalties be split? Who manages publishing and marketing?

The most successful co-authoring partnerships answer these questions before the manuscript is finished, and preferably before the writing even begins.

In this guide, we'll explain how to co-author a book, how two or more authors can organize the writing process, what should go into a co-author agreement, how royalties work, and how to publish a collaborative book successfully.

What Does It Mean to Co-Author a Book?

A co-authored book is a book created by two or more authors who make significant creative contributions to the work.

Co-authoring can take several forms. Two fiction writers might develop a novel together, subject-matter experts might contribute different chapters to a nonfiction book, or one author might take responsibility for the majority of the writing while another contributes specialized knowledge, characters, research, or sections of the manuscript.

Although the terms co-authoring and co-writing are often used interchangeably, the important issue is not the terminology. It is understanding each person's creative contribution, responsibilities, ownership, and financial rights.

A collaborative publishing project may include several different roles:

• Lead author: Often takes primary responsibility for the manuscript, structure, editing, or overall creative direction.
• Co-author: Makes a substantial writing or creative contribution to the book.
• Book owner or publisher: Manages the publishing business, files, distribution, accounts, reporting, or other commercial responsibilities. Ownership arrangements should be specifically agreed rather than assumed.
• Contributor: May include an illustrator, translator, editor, narrator, researcher, designer, or another person involved in creating the finished book.

These roles can overlap. A lead author may also manage publishing, for example, while another co-author handles marketing.

How Does Co-Authoring a Book Work?

In simple terms, co-authoring works by dividing responsibility for creating and publishing a book between multiple people.

A typical co-authoring process looks like this:

1. Choose the right co-author.
2. Agree on the book's concept and audience.
3. Decide who owns what and how revenue will be shared.
4. Create a written co-author agreement.
5. Build a shared outline.
6. Divide the writing and publishing responsibilities.
7. Agree on a writing and editing workflow.
8. Merge the work into a consistent manuscript.
9. Prepare the book for publication.
10. Publish, promote, track sales, and manage royalties.

The writing itself may be collaborative, but successful co-authorship is also a small business partnership. Treating it that way from the beginning can prevent misunderstandings later.

Advantages and Disadvantages of Co-Authoring a Book

Writing with another person can be extremely productive, but it is not necessarily the right approach for every author or every project.

Advantages of co-authoring

• You share the workload. Research, drafting, editing, publishing, and marketing can all be divided between collaborators.
• You can combine expertise. Each author can contribute knowledge or skills the other does not have.
• You gain another creative perspective. A co-author can challenge ideas, solve plot problems, and introduce concepts you may not have developed alone.
• You create accountability. Deadlines are often harder to ignore when another person is depending on you.
• You can combine audiences. When both authors already have readerships, mailing lists, social media audiences, or professional networks, the launch can reach more potential readers.
• You can divide publishing responsibilities. One person might concentrate on the manuscript while another manages metadata, distribution, promotions, or financial reporting.

Disadvantages of co-authoring

• You give up some creative control. Important decisions may require compromise.
• Different working styles can cause friction. One author may write quickly while another prefers a slower process.
• The workload may become unequal. This can cause resentment if expectations were not established upfront.
• Decision-making becomes more complicated. Everything from a character's name to the cover design may become a discussion.
• Financial arrangements are more complex. Revenue, expenses, rights, and royalties need to be tracked between multiple people.
• Legal questions become more important. Copyright ownership, licensing rights, future editions, adaptations, translations, and what happens if the partnership ends should be considered.

How to Find the Right Co-Author

A good co-author does not necessarily need to write exactly like you. In fact, complementary skills can make a partnership stronger.

What matters more is whether you agree on the important things: the purpose of the book, its intended audience, the standard of work expected, the amount of time you can commit, and what success should look like.

Potential co-authors can come from:

• existing writing partners or critique groups;
• professional networks;
• writing conferences and author communities;
• online writing groups;
• social media;
• subject-matter experts in your field;
• authors whose work complements your own.

Before committing to an entire book, consider testing the partnership on something smaller. You might collaborate on a short story, newsletter, article, reader magnet, podcast episode, or detailed book outline first.

That can tell you a great deal about how well you communicate, respond to feedback, meet deadlines, and resolve disagreements.

How to Co-Author a Book: 10 Steps

1. Agree on the Book's Goal and Target Audience

Before writing, both authors need to understand what they are creating and who it is for.

Discuss questions such as:

• Who is the ideal reader?
• What genre or category will the book belong to?
• What does the reader expect from a book like this?
• What is the book's central promise, theme, or story?
• Are you writing primarily for revenue, audience growth, authority, creative satisfaction, or another goal?
• Will this be a standalone book or part of a series?
• Do you plan to self-publish the book or pursue traditional publishing?

These decisions affect everything that follows, including the outline, writing style, word count, title, cover, book metadata, distribution, and marketing.

2. Create a Co-Author Agreement

A co-author agreement sets out how the partnership will work. It can feel unnecessarily formal when two friends are excited about writing a book together, but this is precisely the best time to document expectations.

At minimum, consider agreeing on:

• each author's responsibilities;
• ownership of the manuscript and associated intellectual property;
• how royalties and other income will be divided;
• how publishing expenses will be divided;
• who controls publishing accounts;
• who has authority to approve edits, covers, pricing, and marketing;
• how the authors will be credited;
• rights relating to ebooks, print books, audiobooks, translations, adaptations, and licensing;
• what happens if one author wants to leave the project;
• what happens if one author fails to complete their work;
• how disagreements will be resolved;
• what happens to the rights if one author dies or becomes unable to continue;
• how future books, sequels, revised editions, or spin-offs will be handled.

Copyright rules vary by country. In the United States, for example, the authors of a qualifying joint work can be co-owners of the copyright. For that reason, do not rely on assumptions about who "owns" the book simply because one person is the lead writer or manages the publishing account.

For important commercial projects, consider having a publishing or intellectual-property professional review your agreement. The U.S. Copyright Office provides information about copyright ownership, while organizations such as the Authors Guild provide additional resources for writers.

3. Decide How Co-Author Royalties Will Be Split

There is no universal percentage for splitting co-author royalties.

A 50/50 split is straightforward when two authors contribute approximately equally, but it is not the only option. A project might instead use a 60/40 or 70/30 split if the contributions, existing intellectual property, workload, investment, or responsibilities are significantly different.

The important thing is to define what the percentage applies to.

For example:

• Is the split based on gross revenue or net royalties received?
• Are publishing and advertising costs deducted first?
• Are ebook, print, and audiobook royalties divided in the same way?
• Does the agreement include licensing, translation, adaptation, or subsidiary-rights income?
• Who pays editors, designers, narrators, or advertising costs?
• How often will collaborators receive reports and payments?

Clarifying these points now makes royalty management much easier after publication.

If you need to manage royalties across multiple authors or contributors, PublishDrive's Abacus royalty management software can calculate royalty splits and create transparent reports for collaborators.

4. Outline the Book Together

A detailed outline is particularly valuable when several people are writing the same book.

At minimum, agree on:

• the overall structure;
• chapter order;
• the purpose of each chapter;
• major plot or argument developments;
• key research, examples, or evidence;
• approximate chapter lengths;
• point of view and tense;
• tone and writing style.

For fiction, you may need considerably more detail around characters, story arcs, world-building, chronology, and continuity.

For nonfiction, define the core argument or reader transformation and decide which evidence, examples, case studies, or research support each chapter.

5. Divide the Work Based on Strengths

There are several ways to divide a co-authored manuscript.

By chapter: Each writer owns specific chapters.

By expertise: Authors write the areas they know best.

By function: One person researches and outlines while another writes the first draft.

By character or viewpoint: In fiction, authors might write different characters or alternating perspectives.

By stage: One author creates the draft while another concentrates on developmental editing, revision, or continuity.

The same principle applies outside the manuscript. One author may be better at book marketing, while another prefers managing formatting, metadata, publishing, or financial administration.

Write down who owns each task so that responsibilities do not quietly shift as the project progresses.

6. Establish a Writing and Communication Process

Decide how the collaboration will work day to day.

You should agree on:

• where the manuscript will be stored;
• how files and drafts will be named;
• who can edit which sections;
• how changes are approved;
• how frequently you will meet;
• how quickly collaborators are expected to respond;
• which communication channel will be used;
• how decisions will be recorded.

Cloud-based tools such as Google Docs can make collaborative writing easier because multiple authors can comment, suggest edits, and see revision history. Other teams may prefer Microsoft Word, Scrivener, project-management tools, or a combination of systems.

The exact software matters less than having one agreed workflow.

7. Set Milestones Instead of One Final Deadline

"Finish the book by October" is rarely a detailed enough project plan.

Break the project into smaller milestones, such as:

• outline approved;
• research completed;
• first chapters drafted;
• 50% manuscript milestone;
• first draft completed;
• developmental edit completed;
• revisions completed;
• copyedit completed;
• cover approved;
• final files prepared;
• book uploaded;
• pre-order or publication date;
• launch campaign.

Smaller deadlines make problems visible earlier. If one person falls behind, you can adjust responsibilities before the entire publishing schedule is affected.

8. Make the Writing Sound Like One Book

One of the biggest challenges in co-writing is producing a manuscript that feels intentional rather than assembled from separate documents.

Before drafting, agree on a basic style guide covering issues such as:

• point of view;
• tense;
• tone;
• terminology;
• character names and descriptions;
• capitalization;
• formatting conventions;
• preferred spelling;
• chapter structure.

Do not spend so much time making the first draft stylistically perfect that the project stalls. It is often more efficient for each writer to complete their sections and then unify the voice during revision.

For books using multiple intentional viewpoints, perfect uniformity may not be desirable. The objective is consistency where the reader expects consistency.

9. Agree on Publishing and Marketing Decisions

Once the manuscript is finished, someone still needs to turn it into a book readers can buy.

Decide who is responsible for:

• editing;
• cover design;
• ebook formatting;
• print formatting;
• audiobook production;
• metadata and categories;
• pricing;
• ISBN management where required;
• distribution;
• pre-orders;
• advertising;
• launch activities;
• ongoing promotions.

If you are new to the process, our guide to self-publishing a book covers the major steps from preparing your files through distribution.

Also plan how both authors will use their audiences. You might coordinate:

• email newsletters;
• social media;
• author websites;
• podcast appearances;
• launch teams;
• advance reader copies;
• advertising;
• price promotions;
• retailer merchandising opportunities.

PublishDrive also provides book promotion tools and opportunities for self-published authors and publishers.

10. Create a Transparent Royalty-Management System

Your collaboration does not end when the book goes live.

Once sales begin, someone needs to collect sales data, account for any agreed expenses, calculate each contributor's share, provide reports, and track payments.

This becomes increasingly complicated when a book is sold:

• in multiple formats;
• through multiple retailers;
• in multiple currencies or territories;
• with different royalty rates;
• through subscriptions or library services;
• alongside direct sales or other revenue streams.

Spreadsheets can work for a small project, but the process becomes more time-consuming as the number of books, collaborators, formats, and sales channels grows.

How Do Co-Authors Get Paid?

Co-authors are normally paid according to the financial arrangement they agreed to for the book.

For example, if two authors have agreed to split net royalties equally and the book generates $1,000 in royalties covered by that agreement, each author's share would be $500 before any applicable taxes or other adjustments specified in their agreement.

However, the retailer will not necessarily pay each co-author separately. Often, revenue is first paid into the publishing account used to distribute the book. The book owner or publisher must then calculate the appropriate shares and arrange reporting and payment to the other contributors.

That is one reason royalty-management software can be useful for collaborative publishing.

Managing Co-Author Royalties With PublishDrive Abacus

PublishDrive Abacus is royalty-management software designed for authors and publishers who need to calculate and manage payments across collaborators.

It can be used for collaborative books involving authors and other contributors such as editors, illustrators, or translators.

Importantly, you do not have to distribute your books through PublishDrive to use Abacus. This makes it useful for authors whose books generate sales through different publishing and distribution accounts.

With Abacus, publishers and authors can:

• import royalty data;
• assign contributors to titles;
• set royalty percentages;
• calculate each contributor's share;
• manage royalties for ebooks, print books, and audiobooks;
• generate transparent royalty reports;
• track contributor payments;
• manage multiple titles and collaborators in one place.

For a detailed comparison of PublishDrive's collaboration tools, see our guide to splitting royalties between co-authors.

How to Publish a Co-Authored Book

Publishing a co-authored book is technically very similar to publishing any other book. The main difference is making sure that contributor metadata, rights, financial arrangements, and account responsibilities have been agreed beforehand.

With PublishDrive, you can distribute ebooks, print-on-demand books, and audiobooks through one platform.

A typical publishing workflow includes:

1. Create or sign in to your PublishDrive account.
2. Choose the format you want to publish.
3. Upload the required manuscript, cover, or audio files.
4. Add the authors and other contributors.
5. Complete the book's metadata and categories.
6. Set pricing, rights, and publication information.
7. Select your distribution channels.
8. Submit the book for review and distribution.
9. Monitor sales and royalty reports after publication.

Accurate contributor information is particularly important for collaborative works, so make sure the author names used in your metadata match the way you want the collaborators displayed by retailers.

Co-Authoring Checklist Before You Publish

Before publishing your collaborative book, make sure you can answer yes to the following:

• We have agreed on who owns the relevant rights.
• We have documented how royalties will be divided.
• We know how expenses will be handled.
• We have agreed on author names and billing order.
• We know who controls the publishing account.
• We have agreed on the final manuscript.
• We have approved the cover and book description.
• We have agreed on formats, prices, territories, and distribution.
• We know who can approve future changes.
• We have a process for reporting and paying royalties.
• We know what happens if one author wants to leave the partnership.
• We have agreed on the launch and ongoing marketing plan.

Frequently Asked Questions About Co-Authoring a Book

Can two people co-author a book?

Yes. Two or more writers can co-author a book. They might divide chapters, write different characters or viewpoints, separate research and drafting responsibilities, or collaborate throughout the entire manuscript. The important part is agreeing on responsibilities, rights, decision-making, and financial arrangements before publication.

How do two authors write a book together?

Most successful co-authors begin with a shared concept and detailed outline, divide responsibilities, establish deadlines and a collaborative editing process, and then revise the individual contributions into a cohesive manuscript. There is no single correct workflow, so authors should choose a process that matches their strengths and writing styles.

How are co-author royalties usually split?

There is no standard royalty split for co-authored books. Two equal collaborators may choose a 50/50 split, while other partnerships use different percentages based on workload, intellectual property, expenses, audience contribution, or other responsibilities. Whatever split you choose should be documented in the co-author agreement.

Do co-authors share copyright?

Copyright depends on the applicable law, the nature of each person's contribution, and any agreements or transfers between the parties. Under U.S. copyright law, the authors of a qualifying joint work are co-owners of copyright in that work. Authors should therefore agree explicitly on ownership and licensing rights rather than assuming that one person automatically owns the finished book.

Do co-authors need a contract?

A written agreement is strongly recommended. It can define responsibilities, copyright ownership, royalty percentages, expenses, decision-making, deadlines, publishing rights, adaptations, future editions, and what happens if the collaboration ends. For commercially significant projects, professional legal advice may also be appropriate.

Who should be listed as the first author?

The authors can decide this themselves unless another publishing agreement determines the order. The first-listed author is often the lead author or the person making the largest contribution, but alphabetical order, equal billing, or different billing arrangements can also be used.

Can co-authors self-publish a book?

Yes. Co-authors can self-publish ebooks, print books, and audiobooks just like solo authors. They should decide who will manage the publishing account, distribution, metadata, pricing, marketing, sales reporting, and royalty payments before the book is released.

Can I use PublishDrive Abacus if my books are published elsewhere?

Yes. Abacus does not require you to distribute your books through PublishDrive. It can be used to manage royalty calculations and reporting for collaborative titles using imported sales data.

Should You Co-Author Your Next Book?

Co-authoring can turn writing from a solitary project into a partnership that combines ideas, expertise, audiences, and resources.

The key is not simply finding another writer. It is creating a collaboration in which everybody understands what they are responsible for, how decisions will be made, who owns what, and how the money will be managed.

Get those foundations right and you can spend far more of your time on the part that brought you together in the first place: creating a great book.

If you are ready to publish your collaborative project, create a PublishDrive account and manage your book distribution and publishing workflow from one platform.

If your biggest challenge is managing payments and reports between collaborators, explore PublishDrive Abacus for royalty management across your publishing team.