What Goes Into a Book Proposal? A Guide for Aspiring Authors

Last updated: October 18, 2026

To write a book proposal, you create a business plan for your book: an overview, a description of the readership, comparable titles, your platform and marketing plan, a chapter outline and sample chapters. Book proposals are mainly used for nonfiction, which is often sold to publishers before the book is finished. Novels are usually sold on a complete manuscript and a query letter instead.

Key takeaways

• A proposal answers three questions: so what, who cares and why you.
• Nonfiction is commonly sold on a proposal plus sample chapters. Fiction is usually sold on a finished manuscript.
• The audience section should describe real, specific readers, not "everyone."
• Always follow each agent or publisher's own guidelines.

What sections belong in a proposal?

Jane Friedman describes a nonfiction book proposal as a business plan that must answer "So what? Who cares? Who are you?" (Friedman, 2024). Most proposals include:

1. Overview: a compelling summary of the book, its argument or story, and why it matters now.
2. Target readership: who will buy the book, described specifically.
3. Comparable titles: recent books that show there is a market, and how yours is different.
4. Author bio and platform: your credentials and your existing reach, such as an audience, a newsletter, speaking or media.
5. Marketing and promotion plan: concrete things you can do to help the book reach readers.
6. Chapter outline: a short summary of each chapter.
7. Sample chapters: usually one to three, showing your writing and approach.

Some proposals also include the book's length, format and timeline for delivery.

Do fiction and nonfiction proposals differ?

Yes. For most nonfiction, the proposal is how the book is sold. The publisher buys the idea, the author's credibility and the sample, then the author writes the rest. Jane Friedman notes that nonfiction is typically sold on the basis of a proposal and sample chapters (Friedman, 2024).

For fiction, agents and publishers usually want a finished, polished manuscript, especially for debut authors. Instead of a proposal, you send a query letter, often with a synopsis and sample pages. Established novelists sometimes sell later books on a synopsis and partial manuscript, but that is less common for first books. If you are writing fiction, start with how to write a query letter.

Memoir sits between the two. Some agents want a complete manuscript, others a proposal. Check each agent's guidelines.

How do you describe the audience?

Avoid saying your book is for everyone. Agents want to see that you know who will buy it. A strong audience section:

• Names specific groups: "first-time parents of children with food allergies" rather than "parents."
• Explains why those readers need this book now.
• Points to evidence that the audience exists, such as communities, organizations or the success of comparable titles.
• Connects to your platform, showing how you can reach them.

What is platform, and how much do you need?

Platform is your ability to reach readers: an audience who already knows and trusts you. For nonfiction, especially prescriptive nonfiction, platform often matters a great deal. It might include a newsletter, social media following, podcast, speaking career, professional reputation or media appearances. How much you need depends on the category and the publisher. A strong author brand helps. See author branding for writers.

Where can you find submission requirements?

Every agent and publisher has their own requirements. Look for:

• The submission page on the agent's or agency's website.
• Submission platforms some agents use, which list the exact materials required.
• Interviews or wish lists where agents describe what they are looking for.
• Publisher websites, for small presses that accept unagented submissions.

Following guidelines exactly is one of the simplest ways to make a good first impression.

What are common proposal mistakes?

• A vague audience or no comparable titles.
• Overstating your platform or making promises you cannot keep.
• Sample chapters that are not your best work.
• A chapter outline that is either too thin or a full book summary.
• Ignoring the publisher's guidelines.

Deciding between publishing paths? Read traditional publishing vs. self-publishing. If you want feedback on your proposal or sample chapters, an Editorial Advice Session can help, or book a free consultation.

References

Friedman, J. (2024). How to write a book proposal. Jane Friedman. https://janefriedman.com/book-proposal/