When should we use the inflation rate to calculate the minimum required return for DB plan and when should we not? Sometimes, they mention the inflation rate and only use the liability discount rate. This is probably super simple but if anyone could give me the simple rules as to when to include or not, that would be great!
Inflation is already in the discount rate if liabilities are indexed for inflation. That’s a characteristic of the pension plan and hence the liability cash flows in either real or nominal form, not some economic relationship. The additional return required to grow the surplus is a TVM problem, not simply add inflation.
What about the case where retired lives payments are not indexed to inflation, and active participants’ are? Then using the discount rate would not be enough, so we would have to add inflation going forward right?