Definition for : Final maturity

The "Final Maturity" refers to the date on which a financial instrument must be fully reimbursed. In some cases, the actual Maturity date may vary, for example with the actual pre-payment rate in Residential Mortgage-Backed Securities (RMBS). The "Expected Maturity date" is the most likely forecast based on assumptions. The "Legal Maturity" is the date - posterior to the Expected Maturity Date beyond which the borrowing will be considered in arrears.
(See Chapter 21 Other debt products of the Vernimmen)
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