Originating & Underwriting

New Desktop Underwriter User Interface

Required for all submissions of redesigned Form 1003 files
Need help submitting the redesigned Form 1003 and DU MISMO v3.4 file? 

Look for your answers here first. 

Read the Quick Guide  New DU UI job aids   DU Error Codes


The redesigned Desktop Underwriter® (DU®)/Desktop Originator®(DO®) user interfaces (UIs) feature an updated look and feel and support the redesigned Uniform Residential Loan Application (URLA) (Fannie Mae Form 1003). 

The new UIs will only accept and access submissions of loans using the redesigned Form 1003/DU MISMO V. 3.4 format. All new loans dated on or after May 1, 2021, must be submitted using the updated formats. Any existing loans in the 1003 3.2 or MISMO V. 2.3.1 formats should be accessed and re-submitted in the classic version of DU/DO (accessible on the DU webpage).

For more information on legacy file re-/submission deadlines, see the Mandate and Implementation Timeline section of the Redesigned Form 1003/DU Quick Guide.

Questions & Feedback

To provide feedback on the new interface, please call 800-2FANNIE (800-232-6643), choose Option 1, and then Option 1 again.