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Variations of the model are expressed in percent, e.g., "150% PSA" means a monthly increase of 0.3% in the annualized prepayment rate, until the peak of 9% is reached after 30 months. The months thereafter have a constant annualized prepayment rate of 9%. 1667% PSA is roughly equivalent to 100% prepayment rate in month 30 or later.
Prepayment speeds can be expressed in SMM (single monthly mortality), CPR (conditional prepayment rate, which is the annually compounded SMM), or PSA (percentage of the Public Securities Association prepayment model). For mortgages at least 30 months old, 100% PSA = 6.0% CPR = 0.51% SMM, equivalent to the full prepayment of 6% of a pool's ...
Since prepayments typically rise as interest rates fall and vice versa, the basic (pass-through) MBS typically has negative bond convexity (second derivative of price over yield), meaning that the price has more downside than upside as interest rates vary. The MBS-holder's exposure to borrower prepayment has several names: call risk; extension risk
Commercial Mortgage-Backed Securities (CMBS) and Residential Mortgage-Backed Securities (RMBS) are distinct primarily in the underlying assets that support them. RMBS are securities backed by a home or residential apartment loan bundle, allowing investors to benefit from mortgage payments and homeowners' interest. [5]
While low interest rates are expected to have reduced interest expenses for AGNC Investment (AGNC), higher mortgage prepayments are likely to increase in premium amortization expenses in Q3.
A mortgage-backed security (MBS) is a type of asset-backed security (an "instrument") which is secured by a mortgage or collection of mortgages. The mortgages are aggregated and sold to a group of individuals (a government agency or investment bank) that securitizes, or packages, the loans together into a security that investors can buy.
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Therefore, IO securities are annuity-like securities but the amount and timing of payments is uncertain as payments are based on the total interest payments paid on all the underlying mortgages in the collateral pool. Generally speaking, mortgage prepayments tend to slow down as general interest rates increase.