How to understand PAC support tranche？

A PAC (Planned Amortization Class) support tranche is a type of structured finance security that is designed to provide a predictable stream of cash flows to investors. The support tranche is created by taking a pool of assets, such as mortgages or other loans, and dividing it into multiple tranches. The PAC support tranche is typically the most senior tranche, and it is designed to receive the first priority of cash flows from the underlying assets.

The PAC support tranche is structured to provide investors with a predictable stream of cash flows by using prepayment assumptions and a predetermined amortization schedule. This means that the cash flows from the underlying assets are allocated in a specific order, with the PAC support tranche receiving the first priority of cash flows. As a result, investors in the PAC support tranche can be confident that they will receive a steady stream of income over the life of the security.

To understand PAC support tranche, it is important to note that it is a type of structured finance security that is designed to provide investors with a predictable stream of cash flows. The support tranche is typically the most senior tranche, and it is structured to receive the first priority of cash flows from the underlying assets. This means that investors in the PAC support tranche can be confident that they will receive a steady stream of income over the life of the security.