Guarantee fees on Fannie Mae and Freddie Mac single-family mortgage-backed securities have been edging higher over the past year and in April took a 10 basis point leap higher, but the timetable for future increases is unclear. In April, the government-sponsored enterprises implemented a 10 bp increase in guarantee fees that was mandated by Congress as a way to pay for an extension of a cut in payroll taxes. All of the added revenue from the fee hike, which will remain in effect for 10 years, will go to the U.S. Treasury and not cover Fannie and Freddie credit losses or count toward the GSEs’ obligations...