
The present federal income tax dates from the act signed by President Wilson on October 3, 1913. That act was made possible by the ratification of the Sixteenth Amendment to the Constitution adopted on February 3, 1913. Earlier federal income tax laws had been repealed or held unconstitutional. The income tax first became a significant source of revenue during World War I.
Seventeen internal revenue acts passed from 1913 until they were first codified in 1939. The decade of the 1940s saw the income tax become a mass tax covering a large portion of the population. The withholding provisions of today stem from the Current Tax Payment Act of 1943. The deductions for medical and dental expenses, along with marital income splitting, were enacted in the 1940s. The Highway Trust Fund was set up in 1956 which increased excise taxes on vehicles and products connected with the use of public highways.
The 1960s saw the introduction of the investment tax credit and the enactment of income-averaging provisions. Surcharges were enacted in 1968 and 1969, because of the Vietnam War. A major reform of the tax laws, and the establishment of the individual Alternative Minimum Tax (AMT), was provided in the Tax Reform Act of 1969. The decade of the 1970s was one of reform and simplification, with major tax acts passed in nearly every year. The Tax Reform Act of 1976 provided numerous reform measures, particularly with regard to syndicates and limited partnerships as well as estate and gift taxes.
The beginning of the 1980s witnessed the passage of the Crude Oil Windfall Profits Tax Act and the Economic Recovery Tax Act of 1981, the latter intended to stimulate economic growth. The theme of the 1980s, however, was primarily one of reducing the federal government's large budget deficits. Deficit reduction laws included the Deficit Reduction Act of 1984, the Omnibus Budget Reconciliation Act of 1987, the Technical and Miscellaneous Revenue Act of 1988, and the Revenue Reconciliation Act of 1989. A comprehensive revision of the federal tax system, with a goal of fairness, efficiency, and simplicity, was enacted as the Tax Reform Act of 1986. This act reduced tax rates, eliminated certain deductions, and broadened the tax base as well as recodified the code.
Like the previous decade, the 1990s continued the theme of reducing the budget deficits with passage of the Omnibus Budget Reconciliation Act of 1990 and 1993. Legislation passed during the mid and late portion of the 1990s largely dealt with tax cuts, tax treatment of healthcare and pension benefits, operation of the Internal Revenue Service and a concern for taxpayer rights.
Over the last 10 years Congress has passed numerous tax bills dealing with issues as diverse as Energy, Healthcare, Pensions, Education, Social Security and Transportation. The major bills, listed by year are: