Because the portfolio is usually made up of investment-grade instruments, there is generally no need to rebalance it. Additionally, the payments are virtually guaranteed, as there is a low level of default risk associated with investment-grade instruments.
An example of a dedicated portfolio strategy could involve a pension fund that will begin making payment distributions to plan members in five years' time. To immunize this cash outflow, which is a liability to the pension fund, the fund could purchase five-year government bonds.