Narrow down your topic, audience and purpose of the report. A good report will have a specific topic to cover, such as a new budget for a company's legal department, as well as a specific audience, such as your immediate supervisor or the board of directors. The purpose of your report should also be clear. For example, the purpose of a budget report might be to show where cuts can be made.
Outline the main sections of your report. The main sections include an introduction, a background to your topic, past or related work that have to do with your topic, technical sections which deal specifically with the topic at hand, results, future work that can be done and your conclusions. The technical sections for a budget report, for example, would include all of the various areas in which the department spends money.
Add subsections to the main sections outline of your report. Each section will likely be many paragraphs long. For example, the section on the results of a budget report might include subsections of immediate results, long-term results and results if the cuts that you propose were to be implemented.
Include bullet points for the key information you plan to cover within each subsection. A subsection for long-term results of the current budget, for example, might include bullet points for how the budget would affect lower-level employees, senior-level personnel and the company as a whole.
Fill in the information of the report. This involves writing the introduction, which basically discusses the overall report topic briefly, and turning the bullet points within each subsection into sentences to form paragraphs.
Go through the report and remove any unnecessary or redundant information. A report is written in a business style, which means all sentences and pieces of information should be needed to express the full purpose of the report. Extraneous information should be cut.