A business plan is important because it summarizes both your vision for the company and your blueprint for the company’s operating success. The business plan is a written guide that details the startup and the future direction of your company.Who should write the plan? You, the entrepreneur. No one else knows your business idea and goals better. Yes, there are services that can do the work for you, however, you are the one who must present this business idea to bankers or other investors. Therefore, it is best if you are very familiar and comfortable with the plan.