No, you do not need to form a Limited Liability Company (LLC) to write a book. In many cases, authors write and publish books as individuals without establishing a separate legal entity. Writing and publishing a book is considered an individual creative endeavor, and many authors operate as sole proprietors.

Here are some key points to consider:

1. Sole Proprietorship: If you write a book as an individual without forming an LLC or other business entity, you are automatically considered a sole proprietor. In a sole proprietorship, you and your business are essentially the same legal entity.
2. Legal Protections: While you are not required to form an LLC, doing so could provide some legal protections. An LLC is a separate legal entity, and if properly maintained, it can shield your personal assets from business liabilities. However, for many authors, especially those who self-publish, the risks and liabilities may be minimal.
3. Tax Considerations: As a sole proprietor, your book-related income and expenses are reported on your individual tax return. If you operate as an LLC, you may have additional tax filing requirements, but the specifics can vary depending on your location and the type of income generated.
4. Publishing Contracts: When dealing with publishers or entering into contracts related to your book, they typically deal with you as an individual author rather than a business entity. The legal arrangements are often between you and the publisher or other parties.
5. Business Considerations: If you plan to engage in other business activities related to your book (e.g., public speaking, consulting, workshops), you might consider forming an LLC to separate those activities from your personal assets. This can also provide a professional and organized structure for potential business activities.
6. Legal Advice: It’s advisable to consult with a legal professional or business advisor to assess your specific situation. They can provide guidance on whether forming an LLC is necessary or beneficial based on your individual circumstances and goals.

Many authors successfully write and publish books without forming an LLC. However, the decision to establish an LLC or another business structure depends on various factors, including your business goals, the scale of your activities, and your desire for legal protections. Consulting with a legal or business professional can help you make an informed decision based on your unique circumstances.