Whether you're planning on drafting a business plan for the first time or updating an existing one, writing your plan involves more than just getting your ideas down on paper for potential funders to see. It's an exploratory process in which you can evaluate your options, test your assumptions about your idea, and even discover new opportunities. Check out these comprehensive business plan templates you can download for free to help get you started:

SCORE is an American nonprofit dedicated to helping entrepreneurs get their companies off the ground. Its template, available as a PDF or Word download, asks a whopping 150 questions and is generic enough to customize for most types of businesses.

The SBA's template is available to fill out online and then download as a PDF. You can go back in and edit it as needed, so don't worry about having everything ready the first time you sit down to tackle it.

This website for the best-selling book of the same name, has a ton of stripped-down resources for entrepreneurs, including a simplified business plan template.