The government will subsidize Fannie Mae and Freddie Mac new business to the tune of about $51.0 billion over the next 10 years, according to the latest projections from the Congressional Budget Office.CBO’s most recent budget and economic outlook, released in late August, increased its estimate of the subsidy cost for the two GSEs during the period between 2012 to 2021 from the approximate $41.6 billion that the CBO forecast in June.