Income tax

An income tax is a tax that people or businesses pay based on the money they earn. This tax is calculated by multiplying the amount of money someone makes by a certain tax rate. The tax rate can change depending on how much money a person or business earns. For example, if someone earns more money, they might pay a higher tax rate on the extra amount.

Companies usually pay a fixed tax rate on their profits, which is called corporate tax. For individuals, the tax rate often increases as they earn more money. This is called a progressive tax. Many places also do not tax money that charitable organizations earn. Sometimes, money made from investments is taxed at a lower rate than other types of income.

People and businesses usually have to report their own taxes. If they do not pay what they owe on time, they might face serious consequences. The amount of taxable income is usually the total money earned minus expenses and other allowed deductions. This helps make sure that people only pay tax on their actual profit.

History

The idea of taxing income is a modern idea that needs a money economy, good record-keeping, and a well-organized society.

For most of history, taxes were based on things like wealth, social status, or owning land and slaves. Ancient practices like tithing or giving the first part of a harvest can be seen as early forms of income tax, but they were not precise.

One of the first income taxes was created in 9 CE by Emperor Wang Mang of the Xin dynasty. He taxed net earnings from activities like collecting wild herbs, fishing, and trading. This tax was later abolished in 22 CE because it was unpopular.

In the early Roman Republic, taxes were based on wealth and property. The tax rate was usually 1%, but it could go up to 3% during wars. Taxes were collected from individuals based on what they owned.

The Saladin tithe was introduced in 1188 by Henry II to fund the Third Crusade. It taxed one-tenth of personal income and movable property in England and Wales.

In 1641, Portugal introduced a personal income tax called the décima.

The modern income tax began in 1799 in Great Britain, suggested by Henry Beeke and introduced by Prime Minister William Pitt the Younger to pay for the French Revolutionary War. This tax was graduated, meaning higher incomes paid higher rates. It started at a small rate for incomes over £60 and went up to 10% for incomes over £200. The tax was abolished in 1802 but reintroduced in 1803, only to be abolished again in 1816. It was reintroduced permanently in 1842 by Sir Robert Peel to cover budget deficits.

In the United States, the first personal income tax was imposed in 1861 to help pay for the American Civil War. This was later replaced, and a peacetime income tax was passed in 1894 but ruled unconstitutional. The Sixteenth Amendment to the United States Constitution in 1913 made federal income tax possible. By 1918, income tax collections exceeded one billion dollars for the first time, reaching $5.4 billion by 1920. Tax rates have varied widely over time, from 1% in the early days to over 90% during World War II.

Timeline of introduction of income tax by country

The timeline shows when different countries first started using income tax. It began in the United Kingdom between 1799 and 1802, and then in various years afterward in other countries. Some examples include Switzerland in 1840, the United States in 1861, Japan in 1887, and France in 1914. Many other nations adopted income tax in the 20th century, with Uruguay being one of the most recent in 2007.

Common principles

Most countries have similar ideas about how income tax should work, even though the exact rules can be different. For example, places like Canada, China, Germany, Singapore, the United Kingdom, and the United States share many of these basic ideas. Other countries, like India, might have some different rules.

People and businesses are often taxed differently. An individual is a person, while a business might be called a corporation. Some places let married people choose to be taxed together. Tax rates can change depending on how much money someone makes. For example, in India, people who earn more money pay a higher percentage in taxes.

Economic and policy aspects

Main article: Tax § Economic effects

Income taxes have many effects on the economy. Some people think these taxes are fair because they take a bigger percentage from people who earn more money. However, these taxes can also make it less exciting for people to work harder or invest their money.

When taxes take a big chunk of what people earn, they might decide to work fewer hours or not invest as much. This can slow down the economy because people and businesses are not using their time and money as fully. Also, many people spend time and money trying to find legal ways to pay less tax, instead of using that time and money for other useful things.

Another issue is called bracket creep. When prices go up (this is called inflation), people's pay may go up too, but even if their real pay (what things actually cost) stays the same, they might end up paying more tax. This happens because the tax system does not always change when prices change, so people end up paying a bigger part of their income in taxes even if they are not actually getting richer.

Types of income

Many kinds of money people earn can be taxed, and the rules are different in every country. Usually, taxes are taken from money people earn at jobs, like wages and salaries. Employers often take these taxes out before paying people their money. Other types of income, like extra payments called bonuses, gifts from companies, or money earned from investments, can also be taxed.

How much tax someone pays depends on where they live. Some countries charge very little tax on money from investments, while others charge a lot. When people sell things like houses or stocks for more than they paid, this profit is called a capital gain and can be taxed too. Sometimes, money made from renting out property is taxed, but many countries let people subtract some costs from this income or don’t tax it at all.

Around the world

Main articles: Tax rates around the world and International taxation

Income taxes are used in most countries around the world. The way these taxes work can be different in each place. Some countries use a single flat rate for everyone, while others change the tax rate depending on how much money someone makes.

Countries also have different rules about whose income they tax. Some only tax money made inside their borders, while others tax their citizens on money made anywhere in the world. Many countries also have special agreements to avoid taxing the same income more than once.

Different countries also tax individuals and businesses in different ways. For example, some places tax businesses based on where the business is located, while others tax based on where the business owners live.

Transparency and public disclosure

Some countries, like Finland, Norway, and Sweden, have rules that let people see others' income tax information. In Sweden, this information has been shared in a book called Taxeringskalendern since 1905.