The first and most important part of an income statement is the line reporting sales revenue.  Businesses need to be consistent from year to year regarding when they record sales. For some business, the timing of recording sales revenue is a major problem, especially when the final acceptance by the customer depends on performance tests or other conditions that have to be satisfied. For example, when does an ad agency report the sales revenue for a campaign it's prepared for its client? When the work is completed and sent to the client for approval? When the client approves it? When the ads appear in the media? Or when the billing is complete? These are issues a company must decide on for reporting sales revenue, and they must be consistent each year, and the timing of reporting should be noted on the financial statement.

The next line in an income statement is the cost of goods sold expense. There are three methods of reporting cost of goods sold expense. One is called "first in-first out" (FIFO); another is the "last in-last out" (LIFO) method and the last is the average cost method. Cost of goods sold expense is a huge item in an income statement and how it's reported can make a substantial impact on the reported bottom line.

Other items in an income statement include inventory write-downs. A business should regularly inspect its inventory carefully to determine any losses due to theft, damage and deterioration, and to apply the lower of cost or market (LCM) method. Bad debts are also an important component of the income statement. Bad debts are those owed to a business by customers who bought on credit (accounts receivable) but are not going to be paid. Again the timing of when bad debts are reported is crucial. Do you report it before or after any collection efforts are exhausted?

Of course profit and cost of goods sold expense are the two most critical components of an income statement, or at least they're what people will look at first. But an income statement is truly the sum of its parts, and they all need to be considered carefully, consistently and accurately.

In reporting depreciation expense, a business can use a short-life method and load most of the expense over the first few years, or a longer-life method and spread the expense evenly over the years. Depreciation is a big expense for some businesses and the method of reporting is especially critical for them.

One of the more complex elements of a an income statement is the line reporting employee pensions and post-retirement benefits. The GAAP rule on this expense is complex and several key estimates must be made by the business, such as the expected rate of return on the portfolio of funds set aside for these future obligations. This and other estimates affect the amount of expense recorded.

Many products are sold with expressed or implied warranties and guarantees. The business should estimate the cost of these future obligations and record this amount as an expense in the same period that the goods are sold, along with the cost of goods expense. It can't really wait until customers actually return products for repair or replacement, should be forecast as a percent of the total products sold.

Other operating expenses that are reported in an income statement may also have timing or estimating considerations. Some expenses are also discretionary in nature, which means that how much is spent during the year depends on the discretion of management.

Earnings before interest and tax (EBIT) measures the sales revenue less all the expenses above this line. It depends on all the decisions made for recording sales revenue and expenses and how the accounting methods are implemented.

While some lines of an income statement depend on estimates or forecasts, the interest expense line is a basic equation. When accounting for income tax expense, however, a business can use different accounting methods for some of its expenses than it uses for calculating its taxable income. The hypothetical amount of taxable income, if the accounting methods used were used in the tax return is calculated. Then the income tax based on this hypothetical taxable income is fitured. This is the income tax expense reported in the income statement. This amount is reconciled with the actual amount of income tax owed based on the accounting methods used for income tax purposes. A reconciliation of the two different income tax amounts is then provided in a footnote on the income statement.

Net income is like earnings before interest and tax (EBIT) and can vary considerably depending on which accounting methods are used to report sales revenue and expenses. This is where profit smoothing can come into play to manipulate earnings. Profit smoothing crosses the line from choosing acceptable accounting methods from the list of GAAP and implementing these methods in a reasonable manner, into the gray area of earnings management that involves accounting manipulation.

It's incumbent on managers and business owners to be involved in the decisions about which accounting methods are used to measure profit and how those methods are actually implemented. A manager can be requires to answer questions about the company's financial reports on many occasions. It's therefore critical that any officer or manager in a company be thoroughly familiar with how the company's financial statements are prepared. Accounting methods and how they're implemented vary from business to business. A company's methods can fall anywhere on a continuum that's either left or right of center of GAAP.

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