Financial statements are prepared according to agreed upon guidelines. In order to understand these guidelines, it helps to understand the objectives of financial reporting. The objectives of financial reporting are to provide information that

In order to prepare the financial statements, it is important to adhere to certain fundamental accounting concepts. Going Concern, unless there is evidence to the country, it is assumed that a business will continue to trade normally for the foreseeable future.

Accruals and Matching, revenue earned must be matched against expenditure when it was incurred, if there are two acceptable accounting procedures choose the one gives the less optimistic view of profitability and asset values. Consistency, similar items should be accorded similar accounting treatments. Entity, a business is an entity distinct from its owners. Money Measurement, accounts only deal with items to which monetary values can be attributed.

Separate Valuation :  each asset or liability must be valued separately.
Materiality, only items material in amount or in their nature will affect the true and fair view given by a set of accounts. Historical Cost, Transactions are recorded at the cost when they occurred. Realization, revenue and profits are recognized when realized. Duality, every transaction has two effects.