Mortgage-Backed Securities Balance Terms and Their Distinctions

Summary

The document asks how to distinguish balance terms used for mortgage-backed securities, including original, current, deal, collateral, and unpaid balances. It frames deal balance as principal remaining on the deal, original balance as principal at inception, and asks whether current balance and outstanding balance are equivalent to deal balance. It also raises uncertainty about whether collateral balance matches unpaid principal balance (UPB).

The response defines cut-off balance as the collateral UPB measured on a specified date, often at month-end or a remittance date. It also explains that an overall balance can include deferred principal that earns no interest, so an interest-paying balance may be reported separately. The exchange provides only a couple of definitions and does not settle all the equivalences raised in the question; terminology may depend on the security or reporting context.

Key ideas

• A cut-off balance is the collateral unpaid principal balance measured at a specified date.
• The date used for a cut-off balance is often month-end or a remittance date.
• An overall balance may include deferred amounts that do not earn interest.
• An interest-paying balance identifies the portion of the balance on which interest is paid.

Tags

# Understanding the various terms for balances in MBS


# Understanding the various terms for balances in MBS












I just started working in the MBS space and have a few questions about nomenclature. I've seen the terms "Unpaid Balance", "Collateral Balance", "Original Balance", "Current Balance", "Deal Balance", etc. From my understanding:

"Deal Balance" is the amount of principal that's remaining to be paid down on the MBS deal.

"Current Balance" = "Deal Balance"

"Original Balance" is the amount of principal to be paid down on the deal at inception of the deal.

"Collateral Balance" = This value seems to be different from "Outstanding Balance" (which I assume is equal to "Deal Balance") I believe its the same as Unpaid balance and is the amount of collateral thats being referenced by the MBS. I dont know if this is right?

Usually, when they refer to balance I assume they're referencing the deal balance but am not sure. Can I please get some help with understanding this terminology.

## Answer by toing (score 1)

https://quant.stackexchange.com/a/60817

I will list here few of these for you:







- Cut-off balance: It is UPB of collateral as of a specific date (usually month ends or remittance dates)

- Interest paying balance: Overall balance may include an amount that was deferred and is not expected to pay any interest. Thus, interest paying balance is split out and referred to as interest paying balance.

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