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Uniform Loan Delivery Dataset

The Uniform Loan Delivery Dataset (ULDD) supports the work to implement uniform data standards and defines the data that we require at loan delivery based on loan type, loan feature or other business requirements.

Business Resources

ULDD data is granular, standardized, and has clear definitions, providing sellers with a common understanding of the meaning of each data point. The result is greater transparency, which helps sellers gain a better understanding of our assessment of mortgage risk and purchase requirements on loans they sell to us.

ULDD Revisions

The ULDD Revisions webpage is designed to assist you with loan delivery requirement revisions to ULDD since the last publication. The revisions include ULDD specification updates and ULDD impacts that were previously communicated in Single-Family Seller/Servicer Guide (Guide) Bulletins. The webpage will be updated periodically.

ULDD Phase 5

ULDD Phase 5 incorporates business critical requirements, aligns with the new redesigned UAD 3.6, and supports the Enterprise Credit Score and Credit Reports Initiative.

What's New

Additional Resources

Technical Resources

The following resources provide the technical documentation that Freddie Mac-approved Sellers and vendors need to implement Freddie Mac's loan delivery data requirements:

Appendix A

Freddie Mac XML Data Requirements, V.6.2.0 includes updates to ULDD Phase 5 requirements. Tab Phase 5 Complete consolidates updates with all previous phases. Updated as of May 26, 2026.

Appendix B

Freddie Mac Test Case Scenarios provides common test case scenarios, including Phase 4a and Phase 5 examples, that illustrate how the loan delivery data is translated into MISMO terms – Updated as of Dec. 19, 2023.

Appendix C

Zipped folder containing examples of well-formed XML for each Appendix B Test Case Scenario – Updated as of Dec. 19, 2023.

Appendix D

Freddie Mac XML Data Requirements Reference Tool V.6.2.0, is identical to Appendix A but in Excel format, allowing for easier analysis. Tab Phase 5 Complete consolidates updates with all previous phases. Updated as of May 26, 2026.

Appendix E

Zipped folder containing MISMO 3.0, XLink and ULDD Phase 5 Extension Schema with a visual representation of the extension schema – Updated as of May 26, 2026.

Appendix G

Archived Freddie Mac XML Data Requirements Reference Tool V1.0 containing previous ULDD Phases 1 – 4a. Updated as of May 26, 2026.

Freddie Mac ULDD Phase 3 Implementation Guide

The Implementation Guide is intended for use by a Freddie Mac-approved seller or vendor to facilitate the development of the interface between their product and Loan Selling Advisor.

ULDD Job Aid for the Alignment with UAD 3.6

The job aid is intended to guide and assist you with the mapping between the ULDD and the redesigned Uniform Appraisal Dataset (UAD). Updated as of May 20, 2025.

Announcements

2026

2025

  • May 20, 2025 – ULDD Phase 4a and Phase 5 Updates and Guidance

2023

2022

2021

  • December 14, 2021 – ULDD Phase 4a Specification Release
  • June 8, 2021 – ULDD Updates for CMT-indexed ARMs Retirement, Implementation Notes and Enumerations

2020

  • December 1, 2020 – Updates to Support ULDD LIBOR to SOFR ARM Index Transition, Condo Delivery and Home Possible® Mortgage
  • April 21, 2020 – ULDD Updates Supporting SOFR ARM Index Transition

2019

2018

2017

2016

2013

2012

Uniform Loan Delivery Dataset (ULDD) - Revisions

Most Recent Updates as of May 26, 2026

The Uniform Loan Delivery Dataset (ULDD) revisions webpage is designed to assist you with loan delivery requirement revisions to ULDD since the publication of Appendices A and D on May 26, 2026. These revisions include ULDD specification updates and ULDD impacts that have been previously communicated in the Single-Family Seller/Servicer Guide (Guide) Bulletins.

The information on this webpage will be removed once the revisions have been incorporated into Appendices A and D.

The ULDD revisions are listed in the tables below. These tables identify the communication date and Guide Bulletin number if applicable, Sort ID, Data Point Name, Revision Effective Date, a description of the change, and the ULDD column(s) that have been revised (text being removed will be displayed in red strikethrough, text being added will be displayed in blue).

Revised ULDD Data Points

Important Notice

There are no ULDD revisions at this time.

This information is not a replacement or substitute for the requirements in the Freddie Mac Single-Family Seller/Servicer Guide or any other contractual agreements. This information does not constitute an agreement between Freddie Mac and any other party. © 2026 Freddie Mac.

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