CBO projects a $1.1 trillion federal budget deficit for fiscal year 2012 if current laws remain unchanged. Measured as a share of the nation’s output (gross domestic product, or GDP), that shortfall of 7.0 percent is nearly 2 percentage points below the deficit recorded in 2011, but still higher than any deficit between 1947 and 2008. Over the next few years, projected deficits in CBO’s baseline decline markedly, dropping to under $200 billion and averaging 1.5 percent of GDP over the 2013–2022 period.

Much of the projected decline in the deficit occurs because, under current law, revenues are projected to shoot up by almost $800 billion, or more than 30 percent, between 2012 and 2014—from 16.3 percent of GDP in 2012 to 20.0 percent in 2014. That increase is mostly the result of of the recent or scheduled expirations of tax provisions, such as those initially enacted in 2001, 2003, and 2009 that lower income tax rates and those that limit the number of people subject to the alternative minimum tax (AMT).