Concept

Income tax

Overview

An income tax is a tax imposed on individuals or entities (taxpayers) in respect of the income or profits earned by them (commonly called taxable income). Income tax generally is computed as the product of a tax rate times the taxable income. Taxation rates may vary by type or characteristics of the taxpayer and the type of income.

The tax rate may increase as taxable income increases (referred to as graduated or progressive tax rates). The tax imposed on companies is usually known as corporate tax and is commonly levied at a flat rate. Individual income is often taxed at progressive rates where the tax rate applied to each additional unit of income increases (e.g., the first $10,000 of income taxed at 0%, the next $10,000 taxed at 1%, etc.). Most jurisdictions exempt local charitable organizations from tax. Income from investments may be taxed at different (generally lower) rates than other types of income. Credits of various sorts may be allowed that reduce tax. Some jurisdictions impose the higher of an income tax or a tax on an alternative base or measure of income.

Taxable income of taxpayers who are resident in the jurisdiction is generally total income less income-producing expenses and other deductions. Generally, only net gain from the sale of property, including goods held for sale, is included in income. The income of a corporation's shareholders usually includes distributions of profits from the corporation. Deductions typically include all income-producing or business expenses including an allowance for recovery of costs of business assets. Many jurisdictions allow notional deductions for individuals and may allow deduction of some personal expenses. Most jurisdictions either do not tax income earned outside the jurisdiction or allow a credit for taxes paid to other jurisdictions on such income. Nonresidents are taxed only on certain types of income from sources within the jurisdictions, with few exceptions.

Most jurisdictions require self-assessment of the tax and require payers of some types of income to withhold tax from those payments. Advance payments of tax by taxpayers may be required. Taxpayers not timely paying tax owed are generally subject to significant penalties, which may include jail-time for individuals.

Taxable income of taxpayers resident in the jurisdiction is generally total income less income producing expenses and other deductions. Generally, only net gain from the sale of property, including goods held for sale, is included in income. The income of a corporation's shareholders usually includes distributions of profits from the corporation. Deductions typically include all income-producing or business expenses including an allowance for recovery of costs of business assets. Many jurisdictions allow notional deductions for individuals and may allow deduction of some personal expenses. Most jurisdictions either do not tax income earned outside the jurisdiction or allow a credit for taxes paid to other jurisdictions on such income. Nonresidents are taxed only on certain types of income from sources within the jurisdictions, with few exceptions.

Overview adapted from Wikipedia (CC BY-SA 4.0; see the article history for authors).

In the original texts

Passages from public-domain books where Income tax is discussed.

An income-tax, fairly assessed on these principles, would be, in point of justice, the least exceptionable of all taxes. The objection to it, in the present state of public morality, is the impossibility of ascertaining the real incomes of the contributors. Notwithstanding, too, what is called the inquisitorial nature of the tax, no amount of inquisitorial power which would be tolerated by a people the most disposed…
John Stuart Mill, Principles of Political Economy
states what it is; names the idea; opens on it
Read the chapter · Open in the reader
But when a man besides taking away the money of the citizens has made slaves of them, then, instead of these names of reproach, he is termed happy and blessed, not only by the citizens but by all who hear of his having achieved the consummation of injustice. For mankind censure injustice, fearing that they may be the victims of it and not because they shrink from committing it.
Plato, The Republic
states what it is; opens on it; names the idea
Read the chapter · Open in the reader
King Svein's first act was to levy a terribly increased Income-Tax for the payment of his army. Svein was levying it with a stronghanded diligence, but had not yet done levying it, when, at Gainsborough one night, he suddenly died; smitten dead, once used to be said, by St.
Thomas Carlyle, Early Kings of Norway
opens on it; names the idea
Read the chapter · Open in the reader
Part of that profit naturally belongs to the borrower, who runs the risk and takes the trouble of employing it, and part to the lender, who affords him the opportunity of making this profit. The interest of money is always a derivative revenue, which, if it is not paid from the profit which is made by the use of the money, must be paid from some other source of revenue, unless perhaps the borrower is a spendthrift…
Adam Smith, An Inquiry into the Nature and Causes of the Wealth of Nations
states what it is
Read the chapter · Open in the reader
Nobody will lend his money for less interest to those who exercise the taxed, than to those who exercise the untaxed employments. Taxes upon the revenue arising from stock in all employments, where the government attempts to levy them with any degree of exactness, will, in many cases, fall upon the interest of money. The vingtieme, or twentieth penny, in France, is a tax of the same kind with what is called the land…
Adam Smith, An Inquiry Into the Nature and Causes of the Wealth of Nations
states what it is
Read the chapter · Open in the reader

Related ideas

Place in the tradition

Part of Liberalism.

Explore Income tax in the interactive graph →