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An income tax is a requirement that people pay a percentage of their income (usually on an annual basis) into the coffers of the state in whose territory they reside.
As such, it is deemed by many to be the fairest tax of all, since if a person earned a certain amount of money, they can surely pay a part of it in taxes, especially if they knew in advance that some percentage of their earnings would be cropped. However, there is strong debate among economists as to the distortionary effect of income taxes on the economy, with some (mostly liberal) economists saying that, due to the need to have income, it creates very little distortion, and others (mostly conservative) saying that it does still reduce the incentive to work more or invest more, causing people to then buy more consumptive goods rather than putting the money back into the economy.
Presently, many countries have "progressive taxation" on incomes, meaning that people with larger incomes are taxed in higher proportions. This still leaves the richest people the most money.
Conservatives and libertarians hate them for various reasons:
Nothing is certain except death and taxes (unless you believe in cryonics and have a creative accountant).
Conservatives in the US love to point out (over and over again) that the richest people end up paying the vast majority of the income tax in the US. However, this is because they leave out "payroll" taxes, which everyone (up to a certain dollar amount of income) pays at a flat rate. Due to the cap on taxable income for payroll taxes, they end up making the poor pay far more into the government than regular "income taxes," and in the end the American system ends up looking rather close to a flat tax after all.[citation needed] (Just far, far more complicated.)
As of 2013, the US had the most progressive tax system among the OECD countries.[1] After the Tax Cuts and Jobs Act of 2017 the US tax system was still overall largely progressive in 2019.[2] Even if that's not the case for every form of federal tax, the individual and corporate income taxes in US are all largely progressive.[3]