If you are writing a business plan to get a bank loan or because you`re asking angel investors or venture capitalists for funding, you must include the details of what you need in the executive summary.
Why? Because once you know the details of your business inside and out, you will be better prepared to write your executive summary. After all, this section is a summary of everything else you`re going to write about.
Don`t bother to include terms of a potential investment, as that will always be negotiated later. Instead, just include a short statement indicating how much money you need to raise.
Projections are important not for their actual numbers as much as for their presentation of drivers, relationships between growth and spending, key spending priorities, sales aspirations, and assumptions related to cash flow. They have to be solid and integrated, but accuracy is much more a matter of transparent assumptions than accurately predicting the future.
There is value in doing an ample amount of preparation prior to creating a business plan: you construct creative solutions to complex problems. Make sure to take the time to do the job properly. Additionally, be sure to keep detailed notes on your sources of information and on the assumptions underlying your financial data.
Things like: Could you grow faster with more money? What are your headcount assumptions? How much are you spending on marketing expenses? What are you assuming for payments and collections lags?