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A black budget or covert appropriation is a government budget that is allocated for classified or other secret operations of a nation. The black budget is an account expenses and spending related to military research and covert operations. The black budget is mostly classified because of security reasons. The black budget can be complicated to calculate, but in the United States it has been estimated to be over US$50 billion a year, taking up approximately 7 percent of the US$700 billion American defense budget.