The FHA underwriting guidelines are currently more liberal than any other loan guidelines in the current market. FHA is more forgiving in their approach to mortgage lending.The FHA underwriting guidelines have not been disclosed. As October, 1st, 2008 approaches, lenders, processors and underwriters will have a more clear idea as to what is required to get a loan approval.Homeowners will (probably) be required to pay for a new FHA appraisal, as a condition for loan approval and closing. Underwriting guidelines will determine if this is true. The average costs for an FHA appraisal is ranges, $300 - $450.Income to debt ratios will be determined and posted in the underwriting guidelines. Consult your loan modification specialist or loan officer.