(CNN) -- Here's a look at some background information about the annual income tax filing deadline in the United States. April 15, 2014 is the deadline to file 2013 income tax returns.
2012 (for 2011) Individual Income Tax Returns Total Receipts: 146,243,886
Individual E-filing Receipts TOTAL: 118,401,243 Tax Professionals: 75,139,489 Self-prepared: 43,261,754
Total Individual Refunds Number:120,675,091 Amount: $322.667 Billion Average Refund: $2,674
2011 (for 2010) Individual Income Tax Returns Total Receipts: 143,607,800
Individual E-filing Receipts TOTAL: 111,004,358 Tax Professionals: 71,046,366 Self-prepared: 39,957,992
Total Individual Refunds Number: 119,870,799 Amount: $332.788 Billion Average Refund: $2,692
Where Do The Taxes Go? National Defense 19% Social Security 22% Health & Medical 21% Safety Net Programs 12% Interest on Debt 6% Veterans & Other 20%
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 levied 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 U.S. 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.