Applying federal income tax is more than enough to fund SSI in Puerto Rico
GAO 14, Independent, nonpartisan government agency within the legislative branch that provides auditing, evaluative, and investigative services for the United States Congress. It is the supreme audit institution of the federal government of the United States, “Information on How Statehood Would Potentially Affect Selected Federal Programs and Revenue Sources” U.S. Government Accountability Office, March 31 2014, https://www.gao.gov/products/gao-14-31, NSH-NT
SSI: In fiscal year 2011, actual federal spending for a similar program in Puerto Rico was $24 million; if Puerto Rico had been a state in calendar year 2011, residents would have been eligible for SSI, and estimated federal spending would have ranged from $1.5 billion to $1.8 billion.
All the federal revenue sources GAO reviewed—individual and corporate income taxes, employment tax, excise tax, estate and gift taxes, and customs duties—could be affected if Puerto Rico became a state. For example, under statehood, Puerto Rico residents would be subject to federal tax on all their income: currently, they are subject to federal tax only on income from sources outside of Puerto Rico. Also, some sources of income, such as pension income, are taxed differently in Puerto Rico than in the states. As a result, for 2010, Puerto Rico filers' adjusted gross income for federal tax purposes would have been higher than that for Puerto Rico tax purposes. For some revenue sources, the extent to which federal revenue would change depends on various assumptions. For example, for the two largest revenue sources that would be affected substantially by statehood—individual and corporate income taxes—GAO used various assumptions to estimate a range of federal revenue. The estimate ranges, as described below, are based on Puerto Rico being treated the same as the states in either 2009 or 2010, based on the year for which GAO had the most recent data.
Individual income tax: In 2010, Puerto Rico taxpayers reported paying $20 million to the United States, its possessions, or foreign countries. According to officials from Puerto Rico's Department of Internal Revenue, most of these payments would have been to the United States. If Puerto Rico had been a state in 2010, estimated individual income tax revenue from Puerto Rico taxpayers would have ranged from $2.2 billion to $2.3 billion (after accounting for estimated payments in excess of tax liability from refundable tax credits, such as the earned income tax credit).