An income statement includes the following expenses.
Cost of goods sold- the expenses you incur for the materials and labor.
Selling, General and Administrative Expanses-this head include all indirect expenses, advertising expenses, overhead expenses, rentals, etc.
Depreciation and Amortization- Depreciation shows the decrease in the value of tangible assets like machinery, automobiles, etc; amortization is the decrease in the value of intangible assets like patents and trademarks.
Research and Development-If your business has a research and development facility, you will need to add these costs to the income statement.