Here's what's happening and what it means to home loan rates: What is happening and why? To put it bluntly, the passage of the payroll tax cut extension is being funded via a mandate to Fannie Mae and Freddie Mac (the nation's largest providers of mortgage money) to increase their guarantee fees or "g-fee's" by at least 10 basis points on the rate. So rather than giving a par rate of 4.00%, for example, the par rate is now increased by at least 10 basis points, or approximately 4.10%. But as you probably know…home loan rates are priced and offered in .125% increments, so this will most likely impact the consumer by .125% in rate. Whether you agree or not on the politics behind this cost being passed along to folks who are taking out mortgages, the Congressional Budget Office recently estimated that the increase will ultimately pay for about $35.7 Billion of the cost of the payroll tax extension.