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Mulvaney was born in Alexandria, Virginia, to Michael "Mike" and Kathleen "Kathy" Mulvaney, a teacher, and grew up in Charlotte, North Carolina, where his father became a prominent homebuilder, before moving to Indian Land, South Carolina. His grandparents were originally from County Mayo, Ireland. He attended Charlotte Catholic High School and then Georgetown University, where he majored in international economics, commerce and finance. At Georgetown, he was an Honors Scholar, the highest level of academic achievement awarded to members of the Edmund A. Walsh School of Foreign Service, and ultimately graduated with honors in 1989.

While promoting the Trump administration's budget proposal in March 2017, Mulvaney stated that, as to taxpayers, the government was "not gonna ask you for your hard-earned money, anymore... unless we can guarantee to you that that money is actually being used in a proper function." For instance, Mulvaney justified cuts to block grants that go towards spending on Meals on Wheels because it was "just not showing any results." Others disagreed with Mulvaney's statement, citing research that has "found home-delivered meal programs to significantly improve diet quality, increase nutrient intakes, and reduce food insecurity and nutritional risk among participants. Other beneficial outcomes include increased socialization opportunities, improvement in dietary adherence, and higher quality of life."  On May 22, 2017, Mulvaney presented President Trump's $4.1 trillion 2018 United States federal budget. The budget included cuts to the United States Department of State, the Environmental Protection Agency, and the social safety net and increases in funding for defense spending and paid family leave. The "America First" budget included a 10.6% decrease in domestic program spending and a 10% increase in military spending, in addition to $1.6 billion for a border wall. The budget would remove $272 billion from welfare programs, including $272 billion from the Supplemental Nutrition Assistance Program, also known as food stamps. The budget would also remove $800 billion from Medicaid, and $72 billion from Social Security disability benefits, while removing nothing from Social Security retirement or Medicare benefits. Mulvaney projected the budget will not add to the federal deficit because future tax cuts will lead to 3% GDP growth. He described the budget as "the first time in a long time that an administration has written a budget through the eyes of the people who are actually paying the taxes."  In December 2017, the President signed the Tax Cuts and Jobs Act of 2017. The United States Congress Joint Committee on Taxation forecasted that with dynamic scoring the $1.5 trillion reduction in revenues will increase the federal deficit by $1 trillion. Regulatory implementation of the tax cuts have been delayed by a dispute between Mulvaney and Treasury Secretary Steven Mnuchin regarding the involvement of the Office of Information and Regulatory Affairs.  In February 2018, Mulvaney released the President's $4.4 trillion 2019 United States federal budget, which would add $984 billion to the federal deficit that year, and $7 trillion over the next 10 years. Later that month, the President signed the Bipartisan Budget Act of 2018, which allowed yearly federal deficits to reach $1 trillion. In March 2018, Congress ultimately passed the $1.3 trillion Consolidated Appropriations Act, 2018, which funded the government's operations until the end of the fiscal year in September.
Mick Mulvaney