Why does there exist a contributory system in the nation of the United States? Question 2 The contributory system of the United States nation is an imperative, incremental, egalitarian or constant system, explain. Question 3 What are the personal statuses that exist for taxpayers who file federal returns? Question 4 What are the standard deductions depending on the taxpayer's status at the end of the year? Question 5 What is the formula to arrive at adjusted gross income? What is the formula to arrive at adjusted gross income? Question 6 Mention three deductions that apply to taxpayers for tax benefits. Question 7 What are the three levels of courts that exist in the US where tax aspects can be appealed? Question 8 What are the main sources for tax aspects in the US