source:
  type: guide
  id: fnma-svc-f-3-09
  authority: 'Fannie Mae Servicing Guide F-3-09 — Acronyms and Glossary of Defined
    Terms: I'
  description: 'Fannie Mae Servicing Guide F-3-09 — Acronyms and Glossary of Defined
    Terms: I.'
  coverage_tier: operative
obligations:
- id: fnma-svc-f-3-09-full
  canonical_id: fnma-svc-f-3-09-full
  section: 'Fannie Mae Servicing Guide F-3-09 — Acronyms and Glossary of Defined Terms:
    I'
  type: do
  tags:
  - regulator-direct
  - fnma
  - servicing-guide
  - corpus-expansion
  - tier-operative
  primary_source:
    tier: 1
    authority: 'Fannie Mae Servicing Guide F-3-09 — Acronyms and Glossary of Defined
      Terms: I'
    source_class: fnma-guide
    source_url: https://singlefamily.fanniemae.com/media/document/pdf/servicing-guide
    snapshot_id: cf63a82bbb4adfba
    fetched_at: '2026-05-22T23:53:19Z'
    content_hash: sha256:89df66c43baad07f8a8dd9d224492fff7d15e8839edba02ad0e74c7e50fe5da3
    paragraph_quote: 'F-3-09, Acronyms and Glossary of Deﬁned Terms: I (08/17/2016)
      IDR Independent Dispute Resolution impasse process An option available to a
      seller/servicer or other responsible party for challenging a demand for a servicing
      remedy after the conclusion of the appeal process. imputed interest The interest
      that Fannie Mae assesses on a loan after it has been foreclosed or liquidated
      in order to compensate it for the loss of the use of the funds advanced. inactive
      document custodian An entity that has not certiﬁed MBS or portfolio mortgage
      loans for Fannie Mae in the previous calendar year but is holding mortgage loans
      in custody for Fannie Mae. independent dispute resolution process The process
      for resolving loan-level disputes involving a breach of the Lender Contract.
      Also referred to as “IDR.” institutional lender A ﬁnancial institution that
      invests in mortgage loans and keeps them in its own portfolio. interest accrual
      rate The percentage rate at which interest accrues on the mortgage. In most
      cases, it is also the rate used to calculate the monthly payments, although
      it is not used for ARM loans with payment change limitations. interest bearing
      UPB The portion of the UPB on which interest accrues. interest rate diﬀerential
      See yield diﬀerential adjustment. IRS Internal Revenue Service issue date Published
      May 13, 2026 732 The ﬁrst day of the month in which securities backed by an
      MBS pool are issued. issue date principal balance The principal balance of each
      mortgage loan in an MBS pool after crediting the principal portion of any monthly
      payments due on or before the issue date for the related securities (whether
      or not it was actually collected) and after crediting any unscheduled partial
      payment or other recovery of principal received on or before the issue date
      (as long as it was not accompanied by payment of an interest amount that represented
      scheduled interest due for the month after the payment was made).'
  judgment: false
