The commuted value decision

When you leave a defined-benefit plan before retirement, you’re often handed one of the most consequential — and irreversible — financial decisions of your life: keep the deferred pension, or take its commuted value (CV) as a lump sum. Here’s how to think about it like an engineer.

What “commuted value” means

The commuted value is the present value today of the lifetime pension you’ve earned — the lump sum that, invested, is actuarially meant to reproduce that income. Because it’s a present value, CVs rise when interest rates are low and fall when rates are high. The same pension can be worth very different lump sums depending on when you’re offered it.

The tax trap nobody warns you about

Not all of it lands in your LIRA

Only part of the CV can be transferred tax-free into a locked-in account (a LIRA) — up to the Income Tax Act’s Maximum Transfer Value (MTV). Any amount above the MTV is paid to you as cash and is fully taxable in that year, often at the top marginal rate. On a large CV that excess can be six figures, and the tax bill is immediate.

So a “$900,000 commuted value” is never $900,000 in your pocket — a chunk goes to a LIRA, and the taxable excess is hit hard before you see it.

The hurdle rate: the core of the math

The cleanest way to frame it: what return would the invested CV need to earn, every year for life, to match the guaranteed pension? That’s your hurdle rate.

• If the hurdle rate is high (say 6–7%+), the pension is a great deal — you’d need aggressive, sustained returns to beat it. Keep the pension.
• If the hurdle rate is low (say 3–4%), the lump sum is more competitive, especially if you value control and estate.

Factors that push each way

Lean toward keeping the pension	Lean toward taking the CV
Pension is indexed to inflation	Pension is not indexed
Average or good health / longevity	Health concerns / family history
Plan sponsor is financially strong	Concerns about plan solvency
You value guaranteed simplicity	You value control & flexibility
No need to leave a large estate	Estate / legacy is a priority
You’d struggle to manage a lump sum	You’re a disciplined long-term investor

A note on “but I could invest it myself”

Technical professionals often back themselves to out-invest the pension — and sometimes that’s right. But be honest about three things: the guaranteed, sequence-risk-free nature of the pension, the immediate tax on the excess cash, and your own behaviour in a 40% drawdown. The pension removes exactly the risks that are hardest to manage.

How we’d approach it

We model both paths side by side: the after-tax lump sum (LIRA + taxed excess) invested under conservative and realistic assumptions, versus the guaranteed (and possibly indexed) pension — both stress-tested for longevity and market sequence — then weigh it against your other assets, goals, and estate wishes. No product is sold either way.

Checklist

• Get the CV quote and the deferred-pension figures in writing.
• Calculate how much exceeds the MTV and the tax on that cash.
• Estimate the hurdle rate the invested CV must beat.
• Check whether the pension is indexed and the plan’s funded status.
• Be honest about health, estate goals, and investing discipline.
• Remember: the deadline is real and the choice is permanent — model it before you sign.

Back to DB vs DC pensions, or see how it fits the bigger picture in Your FIRE number.