This quarter’s $6 billion request from taxpayers is the largest since April 2010.

Freddie’s losses are increasing mainly for two reasons: Many homeowners are paying less interest because they are able to refinance at lower mortgage rates. And failing and bankrupt mortgage insurers are not paying out as much money when homeowners default…

Taxpayers have spent about $169 billion to rescue Fannie and Freddie, the most expensive bailout of the 2008 financial crisis. The government estimates it could cost up to $51 billion more to support the companies through 2014.