(CNN)Here's some background information about the annual income tax filing deadline in the United States. April 15, 2019, is the deadline to file 2018 income tax returns.
The IRS's fiscal year runs from October 1 to September 30.
The IRS amassed more than $3.4 trillion in gross tax collections and issued 121,991,952 refunds, totaling about $437 billion.
Total Number of Returns: 150,690,787
Gross Amount Collected: $1,838,403,000,000
(Source: Center on Budget and Policy Priorities)
National Defense 15%
Social Security 24%
Medicare, Medicaid, CHIP, marketplace subsidies, etc. 26%
Safety net programs 9%
Interest on debt 7%
Benefits for veterans & federal retirees 8%
Transportation infrastructure 2%
Science and medical research 2%
Non-security international 1%
All other 4%
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.