USAFacts categorizes government budget data to allocate spending appropriately and to arrive at the estimate presented here. Most government spending on education occurs at the state and local levels rather than the federal.

Government revenue and expenditures are based on data from the Office of Management and Budget, the Census Bureau, and the Bureau of Economic Analysis. Each is published annually, although due to collection times, state and local government data are not as current as federal data. Thus, when combining federal, state, and local revenues and expenditures, the most recent year for a combined number may be delayed.