3) The Income Approach The income approach defines GDP in terms of the income derived or created from producing final goods and services. Net Domestic Income at factor cost = Wages, Salaries, and Supplementary Labour Income + Profits of Corporations and Govt. Enterprises before taxes + Interest and Investment Income + Net Income from Farms and Net investment income is reduced by certain expenses allocable to that income. Modified AGI is your AGI increased by the amount of excluded foreign income. If your modified AGI is more than the threshold amount and you have net investment income, you’ll be subject to the 3.8% tax. Economics · 10 years ago. Is net investment used in calculating GDP? For my macroeconomics class I got one test question wrong and I cant figure out why. I was given a list of accounts and the amount in the accounts and asked to find GDP using the expenditure approach.ROI = (Net Profit / Cost of Investment) x 100 The ROI calculation is flexible and can be manipulated for different uses. A company may use the calculation to compare the ROI on different potential investments , while an investor could use it to calculate a return on a stock . Net investment Cash outflow: Cost of new machine P150,000 Incremental working capital 30,000 P180,000 Cash inflow and savings Net proceeds from sale of old Machine Market value P 48,000 Add: Tax benefit on loss (60,000 48,000) x 35% 4 Documents Similar To Formula for the Net Investment.Net income from an investment after deducting all expenses from the gross income generated by the investment. Depending on the analysis required, the deductions may or may not include income tax and/or capital gains tax.