On the subject of finance, you need to produce realistic financial details. How much money will the business require? What are the expenses required? How much tax will you need to pay? What are the profit margins? Do you stand a good chance of achieving these sums, and how? Finance plans should include income statements, cash-flow statements, balance sheets and profit analysis. This should form a big part of your business plan, in order to convince the vendor or bank manager of your credibility.
As a performance tool, it measures the progression of goals in one's business by tracking, monitoring, as well as evaluating, and can also be used as checkpoints in measuring performance. The world today, is so dynamic that what applied today might not apply tomorrow, and as a result of this dynamism, a good business plan needs to be setup in order to protect one against risks associated with business.