2010. This measure had a sunset provision and was scheduled to expire for the 2011 tax year when rates would have returned to those adopted during the Clinton years unless Congress changed the law; Congress did so bypassing the Tax Relief, Unemployment Insurance Reauthorization and Job Creation Act of 2010, signed by President Barack Obama on December 17, 2010. At first, the income tax was incrementally expanded by the Congress of the United States, and then inflation automatically raised most persons into tax brackets formerly reserved for the wealthy until income tax brackets were adjusted for inflation. Income tax now applies to almost two-thirds of the population. The lowest-earning workers, especially those with dependents, pay no income taxes as a group and get a small subsidy from the federal government because of child credits and the Earned Income Tax Credit. While the government was originally funded via tariffs upon imported goods, tariffs now represent only a minor portion of federal revenues. Non-tax fees are generated to recompense agencies for services or to fill specific trust funds such as the fee placed upon airline tickets for airport expansion and air traffic control. Often the receipts intended to be placed in "trust" funds are used for other purposes, with the government posting an IOU ('I owe you) in the form of a federal bond or other accounting instrument, then spending the money on unrelated current expenditures. Net long-term capital gains as well as certain types of qualified dividend income are taxed preferentially. The federal government collects several specific taxes in addition to the general income tax. Social Security and Medicare are large social support programs which are funded by taxes on personal earned income (see below). Treatment of "income" Tax statutes passed after the ratification of the Sixteenth Amendment in 1913 are sometimes referred to as the "modern" tax statutes. Hundreds of Congressional acts have been passed since 1913, as well as several codifications (i.e., topical reorganizations) of the statutes (see Codification). The modern interpretation of the Sixteenth Amendment taxation power can be found in Commissioner v. Glenshaw Glass Co. . In that case, a taxpayer had received an award of punitive damages from a competitor and sought to avoid paying taxes on that award. The U.S. Supreme Court observed that Congress, in imposing the income tax, had defined income to include: gains, profits, and the income derived from salaries, wages, or