Fed: G-Fee Hikes Would Have Minimal Impact on Agency Originations. Increases to guaranty fees under consideration by the Federal Housing Finance Agency would directly reduce the dollar volume of new agency originations by less than 1.0 percent, according to new research published by the Federal Reserve. In December, then-FHFA Acting Director Edward DeMarco announced a plan to increase the base g-fee for all new Fannie Mae and Freddie Mac mortgages by 10 basis points, update the up-front g-fee grid and eliminate the upfront 25 basis point adverse market fee that has been assessed on all mortgages purchased by Fannie and Freddie since 2008.