Congress’ 11th hour decision at the end of last year to fund a temporary tax cut with a decade-long hike in the guarantee fees that Fannie Mae and Freddie Mac charge to offset potential losses from bad loans will likely prolong the intended wind down of the GSEs, making it much harder to untangle the government from the mortgage market, say experts.Late last month, the Federal Housing Finance Agency directed Fannie and Freddie to increase g-fees on new mortgage products by 10 basis points starting April 1.The FHFA’s directive to the GSEs implements the Temporary Payroll Tax Cut Continuation Act of 2011, passed by the House and Senate and signed by President Obama on Dec. 23. The legislation mandates that Fannie and Freddie raise their single-family guarantee fees by “not less than” 10 bps. The provision is scheduled to sunset in 2021.