The Congressional Budget Office is looking for ways to reduce the budget impact of government-backed mortgage programs and recommends that Fannie Mae and Freddie Mac increase their guarantee fees and/or significantly lower their loan limits. But the CBO admits those changes would result in raising the cost to borrowers and could potentially restrain the housing market. Under CBO scorekeeping, MBS guarantees provided by the two government-sponsored enterprises from 2017 to 2026 will cost the government $12 billion. Reducing subsidies also would help renew private sector participation in the secondary market, the CBO said. It proposes...