Deadline to file 2021 income tax returns is April 18 | See these fast facts

WASHINGTON -- Here's a look at the annual income tax filing deadline in the United States.

April 18, 2022, is the deadline to file 2021 income tax returns.

Why is it not April 15?

The IRS says: "By law, Washington, D.C., holidays impact tax deadlines for everyone in the same way federal holidays do. The due date is April 18, instead of April 15, because of the Emancipation Day holiday in the District of Columbia for everyone except taxpayers who live in Maine or Massachusetts. Taxpayers in Maine or Massachusetts have until April 19, 2022, to file their returns due to the Patriots' Day holiday in those states. Taxpayers requesting an extension will have until Monday, October 17, 2022, to file."

Filing Statistics

The Internal Revenue Service's (IRS) fiscal year runs from October 1 to September 30.

Fiscal Year 2020

The IRS amassed almost $3.5 trillion in gross tax collections and issued almost 122 million refunds, totaling over $736 billion.

Individual Income Tax Returns Filed

Total Number of Returns: 157,195,302

Gross Amount Collected (in thousands of dollars): $1,837,443,578

Total Individual Income Tax Refunds (does not include economic impact payments)

Number: 141,420,379

Amount (in thousands of dollars): $391,223,927

Where Do The Taxes Go?

(Source: Center on Budget and Policy Priorities, FY 2019)

• Medicare, Medicaid, CHIP, marketplace subsidies 25%

• Social Security 23%

• National Defense 16%

• Safety net programs 8%

• Benefits for veterans & federal retirees 8%

• Interest on debt 8%

• Education 2%

• Transportation infrastructure 2%

• Science and medical research 2%

• Non-security international 1%

• All other 4%

Timeline

1862 - During the Civil War, the IRS is born when President Abraham Lincoln and Congress create the Commissioner of Internal Revenue and enact an income tax to pay war expenses. The first income tax levies 3% on incomes between $600 and $10,000 and 5% on anything over $10,000. This income tax lasts until 1872.

1895 - The Supreme Court rules in Pollock v. Farmers' Loan and Trust Co. that taxing incomes uniformly throughout the United States is unconstitutional.

1913 - The 16th Amendment is ratified by the states, giving Congress the authority to enact an income tax. Congress also introduces the first 1040 form and levies a 1% tax on personal incomes over $3,000 with 6% surtax on incomes of more than $500,000.

1918 - During World War I, to help finance the war, the highest rate of taxation on income is 77%. After the war, by 1929, the rate drops to 24%.

1954 - The tax filing deadline is moved from March 15 to April 15, to give taxpayers more time to prepare their returns.

January 3, 1996 - Congress enacts the Taxpayer Bill of Rights to ensure relief from overzealous collection efforts on the part of IRS personnel.

March 20, 2020 - Secretary of the Treasury Steven Mnuchin tweets that tax day is moving from April 15 to July 15 due to the coronavirus pandemic.

March 17, 2021 - The IRS announces the filing deadline has been moved from April 15 to May 17.

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The-CNN-Wire contributed to this report.