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X12 203 — Secondary Mortgage Market Investor Report

The 203 documents the monthly servicer report to an investor (Fannie Mae, Freddie Mac, Ginnie Mae) on the status of a portfolio of loans: collections, defaults, modifications, claims.

Purpose

The 203 carries servicer reporting for the pool or whole loan: remit, principal and interest collected, escrow, delinquencies (30/60/90 days delinquent), loan modifications, foreclosure status. It feeds Fannie Mae Investor Reporting (LARIBA) and Freddie Mac LRPP (Loan Reporting and Remittance Platform).

Acknowledged by 997; the business return is typically an 820 (Payment) from the servicer to the investor for the principal+interest remit. Discrepancies or fixes flow through an 824 or a 203 amendment.

Envelope structure

The 203 travels within the three X12 envelope levels (ISA/IEA, GS/GE with functional group IR, and ST/SE). Didactic example in release 004010:

x12 example-203.x12 
ISA*00*          *00*          *ZZ*SERVICER      *ZZ*FANNIEMAE      *260514*2200*U*00401*000000203*0*P*>~
GS*IR*SERVICER*FANNIEMAE*20260514*2200*1*X*004010~
ST*203*0001~
BGN*00*IR-2026-04*20260514~
N1*SV*ACME SERVICER*24*EIN-SERVICER~
N1*IN*FANNIE MAE*24*EIN-FNMA~
DTM*RT*20260401~
DTM*RT*20260430~
LX*1~
REF*ZZ*MERS-MIN-100012345678901234~
AMT*ZZ*2350.00~
AMT*PE*1875.00~
AMT*N9*475.00~
MSG*CURRENT~
SE*11*0001~
GE*1*1~
IEA*1*000000203~

Common segments

  • Header — ST, BGN, DTM*RT (reporting period start / end).
  • Parties — N1*SV (Servicer), N1*IN (Investor).
  • Loan loop — repeated LX: REF*ZZ MERS MIN, AMT*ZZ (payment due), AMT*PE (principal), AMT*N9 (interest), AMT*N7 (escrow), MSG (status: CURRENT, DELINQUENT, FORECLOSURE).
  • Pool — REF*ZZ for pool ID in MBS reporting.
  • Summary — SE.

Common pitfalls

  • Remit cycle: Fannie Mae standard cycles are Schedule/Schedule, Actual/Actual, or Schedule/Actual; the 203 must reflect the investor cycle — confusing it crashes LARIBA reconciliation.
  • Days delinquent vs months: Fannie uses days (30, 60, 90, 120); some internal servicers use month-end. The conversion must follow Servicer Guide D2-2 — otherwise default reporting is wrong.
  • REO and claims: a loan in REO (Real Estate Owned post-foreclosure) leaves the 203 P&I track and switches to 264 (Mortgage Loan Default Status) — leaving a REO in 203 causes double-reporting.

Documentation

The code 203 and the name Secondary Mortgage Market Investor Report are public and listed on x12.org/products/transaction-sets. The complete structure of loops, qualifiers and code lists is distributed by DISA via the proprietary Implementation Guides (TR3). ediverse.io covers only public concepts, the envelope and didactic examples.