When using the income approach to measure GDP at market prices, in addition to summing all factor incomes it is necessary to

To calculate GDP under the income approach, in addition to summing all factor incomes, it is necessary to add indirect taxes and substract subsidies, and it is also necessary to add depreciation expense of capital goods.

In the case of the addition of taxes and substraction of subsidies, this is done in other to get from factor prices, to market prices, since GDP is based on the latter, not on the former.

A depreciation is added in order to get from net domestic product (NDP) to Gross Domestic Product (GDP).

you're crazy if you think that someone is going to write a 500 word report for you.

answer; post closing trial balance;