Conventional 97 vs FHA Multi-Borrower DTI Blending (2026/2027): Technical Parity Audit & Underwriting Breaking Points Executive Summary: For non-occupant co-signer underwriting, FHA Section 203(b) defeats Conventional 97 by executing a true mathematical blend of occupant and non-occupant debt-to-income up to 56.9% back-end ceilings. Fannie Mae Desktop Underwriter (DU) on Conventional 97 imposes severe occupant standalone…

How to Setup & Execute Fannie Mae Zero-Dollar IDR Underwriting (2026/2027): The Zero-Failure Guide Executive Summary: Structuring a loan file around Fannie Mae 0 dollar IDR payment guidelines rather than the FHA 0.5 percent student loan calculation resolves artificial debt-to-income spikes within Desktop Underwriter in under 15 minutes. Under standard FHA Single Family Housing Policy…