Pension or investment account: why they are not directly comparable
Everything above compares balances. A pension is not a balance, and that makes it the
hardest thing in a settlement to trade fairly.
It is an income stream, not an account
A 401(k) has a number on a statement. A defined-benefit pension has a promise: so much a
month, starting at some age, for as long as you live — and often for as long as a
surviving spouse lives after that. There is no balance to halve. Turning that promise
into a single figure is an act of translation, and the translation is where the argument
usually is.
Valuing one is actuarial work, and this page does not do it
A present value depends on a discount rate, a mortality assumption, whether the benefit
is vested, and which survivor election applies. Change the discount rate alone and the
same pension is worth materially more or less. We are not making those
assumptions here, and the comparison tool above will not pretend to. A pension
valuation for a divorce is a report prepared by an actuary, and if the pension is a
significant part of your settlement you should have one.
Even a correct valuation does not answer the question
This is the part that gets lost. Suppose an actuary values the pension at $600,000 and
the other side takes $600,000 of investments. The numbers agree. The two positions still
are not the same:
- Liquidity. The investments can be spent in any order, in any amount. The pension arrives monthly and cannot be accelerated.
- Longevity. A pension pays for as long as you live, which is protection nobody can buy cheaply. Investments can run out — that is exactly what the feasibility question tests.
- Survivor protection. Whether the pension continues to a former spouse, and at what percentage, is an election with real cost. It is often decided in the settlement and rarely priced in it.
- Inflation. Many private pensions never rise. A fixed payment buys steadily less for thirty years; an invested portfolio at least can grow.
- Flexibility. Investments can be repositioned as life changes. A pension election, once made, is usually permanent.
Which of those matters most depends on the rest of the settlement — what else is liquid,
what the other guaranteed income is, and how long the money has to last. That is the
planning question, and no valuation answers it.