Interest-Rate Risk and Tail Hedging for Public Pensions

Summary

The document contrasts how corporate and public pension plans account for liabilities and asks whether public plans need tail-risk protection. Under the simplified description, corporate plans discount liabilities using market interest rates, so rate changes affect both liability values and fixed-income assets in a partially offsetting way. Public plans instead use a target return that may not move with market rates, while their assets are marked to market. This can leave funded status exposed to changes in asset values without a matching change in measured liabilities.

The proposed response is to consider an option-like hedge against adverse outcomes. The document offers no specific hedge design, valuation method, backtest, or evidence that a particular strategy would improve outcomes. Its account is intentionally simplified: it sets aside salary growth and other features of pension liabilities, and it does not examine the costs, basis risks, governance, or implementation constraints of hedging.

Key ideas

• Corporate pension liability values can move with market interest rates, partly offsetting rate effects on fixed-income assets.
• Public pension liabilities may be valued using a target return that does not track current market rates.
• This accounting difference can create asymmetric exposure in a public plan’s funded status.
• The document raises option-like tail hedging as a possible response but does not specify a strategy.

Tags

# Tail Risk Hedging for Public Pension Plan


# Tail Risk Hedging for Public Pension Plan












Very simplistically, ERISA rules require corporate pension plans to use market rates to discount their liabilities. If interest rates go up, the value of their pension liabilities goes down. Since asset values are also marked to market using market rates, their assets have similar treatment and therefore it is self hedging (at least for the fixed income allocation.)

Public (or government) Pension Plans on the other hand do not use market interest rates to value their liabilities. They use a target pension return, which is rarely adjusted and often do not reflect current market interest rates. As such, the value of their liabilities remains constant (not taking into account growth due to salaries etc.) However, their assets are marked to market in that they are carried at the current market value. As such, this is not self hedging.

Wouldn't it make more sense for Public Pension Plans to have some type of tail risk hedge, or option like strategy, given the asymmetric impact of interest rates on their pension funded status?

Shown in full with attribution under the source's licence. Licence: CC BY-SA 4.0 (Stack Exchange)

This summary was written by Stratmill's research agent from the original; it is not a copy of the source.