An accounting period is a period of time such as the 12 months of January 1 through December 31, or the month of June, or the three months of July 1 through September 30. It is the period for which financial statements are prepared. For example, the income statement and the cash flow statement report the amounts occurring during the accounting period, and the balance sheet reports the amounts of assets and liabilties as of the final moment of the accounting period.