A progressive tax is a type of tax in which the tax rate rises in direct proportion to the quantity of money that is taxed. As the name implies, the term progressive refers to the way in which the tax rate increases over time as it proceeds from low to high levels, with the effect that a taxpayer’s average tax rate is less than the individual’s marginal tax rate. Individual taxes or a tax system as a whole might be referred to as “taxation without representation.”
In an attempt to lessen the tax incidence of persons with a lesser ability to pay, progressive taxes are applied in a way that shifts the incidence of taxation increasingly to those with a higher ability to pay. A regressive tax, such as a sales tax, is the polar opposite of a progressive tax since it requires the poor to pay a greater proportion of their income than the wealthy.
In the context of personal income taxes, the word is typically used to refer to the fact that those with lower incomes pay a lesser percentage of their income in taxes than do those with higher incomes in this country. It can also apply to adjustments to the tax base that are made by the use of tax exemptions, tax credits, or selective taxation that results in a progressive distribution of income.
When a wealth or property tax is imposed or when there is an exemption from sales taxes on basic needs, these are examples of progressive taxation since they increase the tax burden on higher-income households while decreasing the tax burden on lower-income families.
When it comes to mitigating the social evils associated with increased income inequality, progressive taxation is frequently recommended because the tax structure reduces inequality, however experts disagree on the economic and long-term impacts of the tax policy.
According to one study, progressive taxation can be connected with pleasure, the subjective well-being of nations, and citizen satisfaction with public goods such as education and transportation, all of which are positive outcomes.
In the early days of the Roman Republic, public taxes were mostly comprised of assessments on privately held wealth and land. The tax rate for Roman residents was 1 percent of their property value under normal conditions, but it may sometimes go as high as 3 percent in extreme circumstances such as war. These taxes were collected against land, homes and other real estate, slaves, animals, personal belongings, and monetary wealth, among other things.
Because of the wealth amassed from conquered regions, Rome no longer needed to charge a tax upon its residents on the Italian peninsula by 167 BC, and the taxation system was abolished. Following significant Roman growth in the first century, Augustus Caesar instituted a wealth tax of approximately 1 percent plus a flat poll tax on each adult, making the tax system less progressive because it no longer primarily taxed wealth.  The Dahsala system was introduced in India during the reign of Akbar in 1580 A.D.
The system is still in use now. It was Raja Todar Mal, the finance minister of Akbar who was placed in Gujarat in A.D. 1573, who was responsible for introducing this system. The Dahsala system is a land-revenue system (a taxation system) that contributed to the organisation of the collecting system on the basis of soil fertility. It is a system of taxation. Polaj land, Parati land, Cachar land, and Banjar land are all types of land.
To pay for armaments and supplies for the French Revolutionary War, Prime Minister William Pitt the Younger instituted the first modern income tax in Britain in his budget of December 1798. The levy was the world’s first modern income tax. A levy of 2 old pence in the pound (1/120) on incomes above £60 was the starting point for Pitt’s graduated (progressive) income tax, which climbed to a maximum of 2 shillings in the pound (10 percent) on incomes over £200.
Pitt had hoped that the new income tax would yield £10 million, but the actual receipts for 1799 came to just over £6 million, falling short of his expectations. 
Pitt’s progressive income tax was in effect from 1799 until 1802, when it was repealed by Henry Addington as part of the Treaty of Amiens, which brought the country to a close. Addington had assumed the position of prime minister in 1801, following Pitt’s resignation on Catholic Emancipation concerns. The income tax was reinstated by Addington in 1803 when hostilities resumed, but it was repealed a year later, in 1816, one year after the Battle of Waterloo, and never reinstated again.
The Income Tax Act 1842, established by Sir Robert Peel, was the first time the United Kingdom’s income tax was reinstated. The Conservative Peel had opposed income tax during the 1841 general election, but a rising budget deficit necessitated the introduction of a new source of revenue. The new income tax, which was based on Addington’s plan, was imposed on those earning more than £150 per week. However, despite the fact that this measure was originally supposed to be temporary, it quickly became a permanent feature of the British taxation system.
A committee headed by Joseph Hume was formed in 1851 to look into the subject, but they were unable to come up with a definite suggestion. Despite widespread opposition, William Gladstone, Chancellor of the Exchequer from 1852 to 1858, maintained the progressive income tax and increased its rate to meet the costs of the Crimean War. As early as the 1860s, the progressive tax had gained acceptance as an important component of the English fiscal system. 
The Revenue Act of 1862 in the United States was the first piece of legislation to establish a progressive income tax. The Revenue Act of 1861, which had levied a flat income tax of 3 percent on incomes exceeding $800, was repealed by President Abraham Lincoln and replaced by the Revenue Act of 1861.
Congress was granted complete taxation authority by the Sixteenth Amendment to the United States Constitution, which was ratified in 1913 and abolished the requirement that income taxes be apportioned. By the middle of the twentieth century, nearly every country had adopted some sort of progressive income tax.
Marginal and Effective Tax Rates
The rate of taxation can be expressed in two different ways: the marginal rate, which is the rate applied to each additional unit of income or expenditure (or each additional dollar spent), and the effective (average) rate, which is the total amount of tax paid divided by the total amount of income or expenditure (or the last dollar spent). Although there may be some ranges where the marginal rate remains constant, most progressive tax systems will see both rates climb as the amount subject to taxation increases.
Generally speaking, the average tax rate of a taxpayer will be lower than the marginal tax rate of the person. The possibility of marginal rates falling as income rises in a system that includes refundable tax credits or income-tested welfare payments exists at lower levels of income in a system that includes these features.
Inflation and Tax Brackets
It is possible that tax laws have not been correctly adjusted to inflation. Some tax regulations, for example, may completely disregard the effects of inflation. A progressive tax system that does not index the brackets to inflation eventually results in effective tax increases (if inflation is sustained), as wage inflation raises individual income and forces individuals into higher tax brackets with higher percentage rates, as opposed to a flat tax system that does not index the brackets to inflation. This behavior is referred to as bracket creep, and it has the potential to cause budgetary fiscal drag.