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Tax policy is the choice by a government as to what taxes to levy, in what amounts, and on whom. It has both microeconomic and macroeconomic aspects. The macroeconomic aspects concern the overall quantity of taxes to collect, which can inversely affect the level of economic activity; this is one component of fiscal policy. The microeconomic aspects concern issues of fairness (whom to tax) and allocative efficiency (i.e., which taxes will have how much of a distorting effect on the amounts of various types of economic activity).A country’s tax regime is a key policy instrument that may negatively or positively influence the country's economy.
Tax policies have significant economic consequences for both a national economy and particular groups within the economy (e.g., households, firms and banks). Tax policies are often designed with the intention of stimulating economic growth—although economists differ significantly about which policies are most effective at fostering growth. 
Taxation is as much a political issue as an economic issue. Political leaders have used tax policy to promote their agendas by initiating various tax reforms: decreasing (or increasing) tax rates, changing the definition of taxable income, creating new taxes on specific products, and so forth. Of course, no one particularly wants to pay taxes. Specific groups, such as small business owners, farmers, or retired individuals, exert significant political effort to reduce their share of the tax burden. Tax codes are packed with rules that benefit a certain group of taxpayers while inevitably shifting more of the burden to others.
Main reasons for taxation
There are some main reasons why government needs to levy taxes:
- Market failure - mainly to discourage purchases of that product (any tax creates a disincentive, so consumers will reduce their purchases and seek alternatives).
- Taxes can create incentives promoting desirable behaviour and disincentives for unwanted behaviour. Tax changes human behaviour and thus influences the market outcome. For example, in presence of externalities, we want to change the market outcome to reach the social optimum (otherwise there is a deadweight loss of externality) - in these cases policymakers implement excise taxes, carbon tax etc.
- To generate revenue.
- Changing the distribution of income and wealth.
- Taxation provides a means to redistribute economic resources toward those with low income or special needs (tax revenue can be used for transfer payments such as welfare benefits).
The reason for such focus is economic efficiency as advisor to the Stuart King of England Richard Petty had noted that the government does not want to kill the goose that lays the golden egg. Paradigmatic efficient taxes are those that are either nondistortionary or lump sum. However, economists define distortion only according to the substitution effect, because anything that does not change relative prices is nondistortionary. One must also consider the income effect, which for tax policy purposes often needs to be assumed to cancel out in the aggregate. The efficiency loss is depicted on the demand curve and supply curve diagrams as the area inside Harberger's Triangle.
National Insurance in the United Kingdom and Social Security in the United States are forms of social welfare funded outside their national income tax systems, paid for through worker contributions, something labeled a stealth tax by critics.
The implementation of tax policy has always been a tricky business. For example, in pre-revolutionary colonial America, the argument "No taxation without representation" resulted from the tax policy of the British Crown, which taxed the settlers but offered no say in their government. A more recent American example is President George H. W. Bush's famous tax policy quote, "Read my lips: no new taxes."
Modern taxation systems have the capacity to impose a heavy burden on taxpayers, and particularly on small business taxpayers. That burden typically consists of three elements. Firstly, there are the taxes themselves. Secondly, there are the efficiency costs (variously referred to as deadweight losses or excess burden). And finally, there are the administrative costs (sometimes referred to as operating costs) of the tax system.
When implementing some new parts of tax policy or reorganizing it, policymakers always have to consider the weight of administrative costs of taxation. There are two main types of administrative costs:
- Direct administrative costs
- Indirect administrative costs
Direct administrative costs
Direct administrative costs are on the government side (the burden is borne by the government). Allers (1994, p. 19) defines administrative costs as “costs incurred by (mainly) public sector agents in order to administer the tax-benefit system”. He then goes on to note that “it is not immediately obvious, exactly, which activities should be attributed to the operation of the … system” (p. 19). Administrative costs are mainly connected to running the tax collection office - it includes salaries of staff, costs of legislative enactment relating to the tax system, judicial costs of administration of the tax dispute system and many more.
Indirect administrative costs
Indirect administrative costs are on the side of taxpayers (the burden is borne by the government). Tax compliance costs are those costs “incurred by taxpayers, or third parties such as businesses, in meeting the requirements laid upon them in complying with a given structure and level of tax” (Sandford, Godwin and Hardwick, 1989, p. 10). Indirect administrative costs are mainly connected to the costs of complying with tax requirements - it includes the costs of labour/time consumed in completion of tax activities, filling out forms, record keeping, the fees paid to professional tax advisers, transfer pricing and many more.
Equity vs. Efficiency
An equity-efficiency tradeoff appears when there is some kind of conflict between maximizing the equity and maximizing economic efficiency. The trade-off between equity and efficiency is at the heart of many discussions of tax policy. Two questions are debated. First, there is disagreement about the nature of the trade-off . To reduce inequality, how much efficiency do we have to give up? Second, there is a disagreement about the relative value to be attributed to the reduction in inequality compared to the reduction in efficiency. 
Some people claim that inequality is the central problem of society, and society should simply minimize the extent of inequality, regardless of the consequences to effi ciency. Others claim that efficiency is the central issue. These disagreements relate to social choices between equity and efficiency.
Equity cen be divided into two main groups: horizonat equity and vertical equity.
Vertical equity is a method of taxation based on the principle that the higher the income of an individual is the higher is the personal income tax liability (i.e. as your income goes up, you pay more). Vertical equity is often more achievable than horizontal equity, because horizontal equity is harder to implemet - it is not easy to define and it can be undermined by loopholes and deductions.
Horizontal equity is an economic theory in which similar individuals should pay similar taxes. But there is one big problem in this theory - How to define similar individuals? Horizontal equity is a constant topic of tax policy discussions and in many countries it is a cause of several exemptions, deductions and special provisions.
Efficiency for economists is equal to the concept of Pareto efficiency. Pareto efficiency means the situation of resource allocation where the concept of 'net' is dominant. In other word, basically we need to make someone worse in order to make others better under this efficiency. To seek for the efficiency, it is necessary to build the decentralized market mechanism. And to build that mechanism, tax system is often seen as an obstacle. Here, we need to think about the balance between efficiency and equity. And the best point of this balance is called 'Pareto improvement'. This is the ideal answer to reply for the question of which policies should be implemented. 
The choices or decision of government are one of social choices. And social choice consists of two elements. First, it is the individual level. Second, it is the society's level. As far as the individual level, each individual builds their preference and has their utility following the budget's constraint and so on. This can make the indifference curve. And we can say that the points which are on this curve are matched to pareto efficiency. In the society's level, the curve are created by seeing the participants as group A and group B. Here, the curve becomes the inverse proportional one which is very common style in the Pareto efficiency's curve. In this curve, when group A's utility will get down, group B's utility will get increased. The relation between them is like trade-off style. This is the very typical example of social indifference curve (There are other curves in other ways: Utilitarian way and Rawlsian way. And I will introduce them in the below paragraph). In the above, I mentioned about the thinking way or the process of social choice. Now, when we try to take some policies, we need to measure the net benefits of different groups and to think about if the project is the Pareto improvement. If the project has the net positive gains and reduces measured inequality, it should be taken. If it is not so clear to understand so, we need to have other points to judge. Basically, there are three ways to do so: the compensation principle, the trade-off across measures of efficiency and equality, and the weighted benefits approach. The latter two are relatively easy to understand. The trade-off one is the judgement based on the contemplation of efficiency and equality. The weighted benefits approach is focused on the total amount of utility. When we think about the compensation principle, we need to care about the willingness to pay the tax. If people are motivated to pay, the consumer surplus is getting higher. And in this principle, when the willingness to pay is more than the cost to do so (even when the cost is higher for some people), the projects should be taken. The compensation principle can overcome the difficulty of taxation due to the intervening efficiency.
In the above paragraph, I mentioned that social indifference curve becomes the inverse proportional curve. But if you take the position of utilitarianism, the shape of curve will be different. The curve becomes straight line. It means that two different groups' utility can make trade-off completely. Here, the differentiation of individuals or each group becomes meaningless. So the society does not need to care about how to take the balance between them. The welfare of society is literally equal to the total amount of welfare of group A and group B.
Social indifference curve from the view of Rawlsian approach becomes L shape. This is related to the Rawls's approach to social justice. In his approach, the state needs to secure some basic human rights and some economic basements from the deprivation. And when we think about its economic aspects, Rawls shows that the state gives the minimum utility to the people. Here, in this approach, the welfare of society is equal to the welfare of worst-off individual. There is no trade-off relation here because the certain utility is not changeable. Therefore, the curve in this approach becomes L shapes.
- Tax incidence
- Tax law
- Tax policy
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