What is a book proposal?

You have an idea for a non-fiction book. You are convinced it needs to exist. Now you need to convince a publisher. A book proposal is how you do it.

A book proposal is a formal document submitted to a literary agent or publisher that makes the case for a non-fiction book before it is written. Unlike fiction, where authors are typically expected to complete the manuscript before submitting, most traditional non-fiction is acquired on the basis of a proposal alone — which means the proposal is not just a pitch, it is the primary tool through which a book deal is won or lost.

In practice, a book proposal typically includes an overview of the book — its central argument, its scope, and why it matters now — alongside a detailed analysis of the target audience and the competitive landscape, demonstrating that the author understands the market and can articulate where their book sits within it. It also includes an author biography that establishes credibility and platform, a chapter by chapter outline that shows the book is fully thought through, and one or two sample chapters that demonstrate the author can actually write it. Together these elements need to answer three questions a publisher is always asking: Is this a good idea? Is there an audience for it? Is this the right person to write it?

A book proposal is not the same as a query letter, which is a shorter, introductory pitch used to approach literary agents in the first instance. A query letter gets you a request for the proposal; the proposal gets you the deal.

Writing a strong book proposal is a significant undertaking — it requires as much thought and craft as the book itself. Many authors underestimate this, submitting proposals that are underdeveloped or that fail to engage with the commercial realities a publisher needs addressed.

A book proposal is relevant to any author pursuing a traditional publishing route for narrative or prescriptive non-fiction — memoir, business, history, self-help, popular science, and most other non-fiction genres. For fiction authors, the equivalent is a completed manuscript and a synopsis.

Your proposal is your book's first impression. It needs to do the work before the book gets the chance to.