Security Balance

The balance for an MBS mortgage (or a participation interest in an MBS mortgage) that is determined by reducing Fannie Mae’s share of the issue date principal balance of the mortgage by its share of any principal distribution amounts included in subsequent monthly remittances; the balance for an MBS pool that represents the aggregate security balance of all the mortgages (or participation interests) in the pool as of any date, which is equal to the aggregate issue date principal balances of the mortgages (or participation interests) less any subsequent principal distribution amounts.