Pension Lump Sum or Monthly Payment? The 5% Rule

The decision, resolved with one division

Dave is 55. He spent 28 years at a manufacturing company in Columbus, Ohio, files single, and has just been handed a pension election form with a deadline. Option A: a $250,000 lump sum he can roll into an IRA. Option B: a $1,375/month monthly pension for life, starting now — that’s $16,500/year. The HR packet calls it a “buyout” and the cash figure looks enormous next to the monthly check. He’s tempted to take the money.

Before any spreadsheet, do the division that decides it: $16,500 ÷ $250,000 = 6.6%. That is the implied discount rate the pension plan is using — the annual return Dave would have to earn on the $250,000, every single year for the rest of his life, net of fees and taxes, just to match the income the monthly pension hands him for free. For a 55-year-old facing a 30-plus-year horizon, beating 6.6% reliably is a hard bet. The monthly pension wins this one.

That is the whole framework. Everything below explains why 6.6% is the wrong side of the line, what an early-retirement subsidy is doing to inflate the monthly option in Dave’s favor, and the access trap waiting if he rolls the cash to an IRA at 55.

The implied discount rate: the number that actually matters

A monthly pension is an annuity — a stream of payments for life. A lump sum is the present value of that stream, calculated by your plan’s actuaries using IRS §417(e) segment rates and a prescribed mortality table. The plan is, in effect, offering to buy back its promise. The implied discount rate tells you the price.

Flip the present-value formula around and you get a shortcut precise enough for the decision: annual pension ÷ lump sum ≈ implied rate (this slightly understates the true internal rate of return because it ignores the eventual return of principal, but it’s conservative and directionally correct). Read it like a yield:

Why is 5% the rough dividing line? Because a retiree who keeps the cash has to clear several hurdles before a dollar of that return reaches the dinner table: investment fees, taxes on withdrawals, inflation eroding purchasing power, and the simple fact that you cannot take portfolio risk with money you need for groceries. The widely cited “safe” sustainable withdrawal rate sits around 4%. If the pension is paying you an implied rate above that, it is handing you income a prudent portfolio cannot safely match.

Dave’s 6.6% is well past the line. To replicate $16,500/year from $250,000 sustainably, he would need a withdrawal rate of 6.6% — far above the 4% that survives historical sequence stress tests. He would very likely run the account dry while a person who kept the monthly pension is still cashing checks.

The early-retirement subsidy: the trap that makes 55 different

Here is what most people miss, and it is the entire reason this decision is different at 55 than at 62. Many private defined-benefit plans subsidize early retirement. If you retire at 55 with enough years of service, the plan pays a monthly benefit that is more generous than the actuarially “fair” reduced amount. It is a retention-and-transition perk baked into the plan document — and it shows up only in the monthly option.

The lump sum does not capture it. The cash-out is computed strictly from §417(e) segment rates and a standard mortality table; it pays you the actuarial present value, not the subsidized value. So when a plan offers an early-retirement subsidy, the monthly stream is quietly worth thousands of dollars a year more than the lump sum reflects — and the implied discount rate you calculate is artificially high precisely because the subsidy inflated the numerator.

How to spot it: pull your plan’s Summary Plan Description and look at the early-retirement reduction factors. A purely actuarial plan reduces the benefit by roughly 6–7% for each year you claim before normal retirement age. If your plan’s reduction is much gentler than that — say 3% per year, or zero reduction at 55 with 30 years of service — you are holding a subsidized benefit. Taking the lump sum throws that subsidy in the trash.

• Actuarial (no subsidy): ~6–7% reduction per year before normal retirement age. Lump sum and monthly are roughly equivalent in value.
• Subsidized: reduction much smaller than 6–7%/yr, or a flat “unreduced at 55 with X years of service.” The monthly option is worth materially more than the cash.
• Check the document, not the HR summary email. The subsidy lives in the plan’s reduction-factor table, which the one-page election form rarely shows.

Sequence-of-returns risk: why a loss at 55 hurts more than a loss at 75

Suppose Dave takes the $250,000 anyway, rolls it to an IRA, and starts drawing $16,500/year to match the pension. The order in which returns arrive now controls his outcome — this is sequence-of-returns risk. Two retirees can earn the identical average return over 30 years and end up in completely different places: the one who hit a bad market in years one through five, while withdrawing, can run out of money; the one who hit the same bad years late stays solvent.

The mechanism is simple. Selling shares to fund withdrawals during a downturn locks in losses and leaves fewer shares to recover when the market rebounds. A 30% drawdown in 2008-style year one, layered on top of a 6.6% withdrawal, can permanently cripple the portfolio. At 55, Dave has the longest withdrawal horizon — 30 to 40 years — so an early shock compounds against him for decades.

The monthly pension is structurally immune to this. The check is the same size whether the S&P fell 30% or rose 30% last year. For a 55-year-old, that insulation is worth a great deal — it is precisely the risk a defined-benefit pension was designed to remove, and the lump sum hands it right back to you.

The Rule-of-55 trap if you roll the lump sum to an IRA

Say Dave decides he wants the cash for flexibility. There is an access mistake waiting that costs a flat 10% penalty.

The Rule of 55 lets you take penalty-free distributions from the 401(k) or employer plan you separate from in the year you turn 55 or later — an exception to the usual 59½ rule under IRC §72(t)(2)(A)(v). But it applies only to that employer plan. The instant Dave rolls his pension lump sum into a traditional IRA, IRA rules take over and the Rule of 55 evaporates. Any IRA withdrawal before 59½ now faces a 10% early-withdrawal penalty on top of ordinary income tax.

1. Roll to an IRA — clean and simple, but no penalty-free access until 59½ without a §72(t) SEPP.
2. Roll into a current 401(k) that accepts incoming rollovers — if you separated at 55+, Rule-of-55 access can apply to that plan’s balance.
3. Set up a §72(t) SEPP on the IRA — a series of substantially equal periodic payments that runs penalty-free, but it is rigid: you must continue it for the longer of 5 years or until 59½, and breaking it retroactively re-imposes the 10% penalty on every prior payment.

If penalty-free access between 55 and 59½ matters to you, decide the access route before you sign the rollover. Once the money lands in a plain IRA, the cheapest path (Rule of 55) is gone.

The same fork at 62 looks completely different

Run Dave’s identical $250,000 buyout seven years later and the analysis shifts. At 62 the withdrawal horizon is shorter, so sequence risk does less damage. The early-retirement subsidy that inflated the 55-year-old monthly option has usually faded — by the early 60s many plans pay close to the unreduced, actuarially fair benefit, so the implied discount rate on a cash-out at 62 tends to be lower and more honest. And at 62 you are within reach of Social Security, which changes how much guaranteed lifetime income you actually need from the pension.

Note one thing the pension election does not touch: Required Minimum Distributions. RMDs (now starting at age 73 for anyone born 1951–1959, and 75 for those born 1960 or later under SECURE 2.0 §107) are irrelevant at 55 or 62 — but a rolled-over IRA will eventually be subject to them, so the lump sum carries a future RMD obligation the monthly pension never does.

What about Social Security — can you do both?

Yes, and they are independent decisions. Your pension election has zero effect on Social Security eligibility or benefit size. The most powerful coordination at 55 is a bridge: live off the pension (or the rolled IRA) from 55 onward while letting Social Security grow. Every year you delay Social Security past full retirement age — 67 for anyone born 1960 or later — earns an 8% delayed-retirement credit, up to age 70. That can lift your eventual Social Security check by roughly 24% over claiming at 67, and it is inflation-adjusted for life.

So the cleanest combination for many early retirees is: keep the guaranteed monthly pension to cover baseline expenses now, and delay Social Security to 70 to maximize the second guaranteed, inflation-protected income stream. Two annuities the market cannot take away beat one lump sum exposed to a 30-year sequence of unknown returns.

What most people get wrong

• “$250,000 is obviously more than $1,375 a month.” It isn’t, until you do the division. $16,500/year for 30+ years, before any growth, is roughly $495,000 of nominal payments — and that ignores the subsidy and the longevity insurance.
• Ignoring the early-retirement subsidy. The single biggest error at 55. The lump sum never reflects it, so the cash always looks artificially good relative to the monthly option.
• Assuming the rollover preserves Rule-of-55 access. It does not. Rolling to an IRA forfeits penalty-free access before 59½ unless you build a §72(t) SEPP.
• Forgetting the 20% mandatory withholding on a non-direct rollover. If the lump sum is paid to you instead of trustee-to-trustee, the plan must withhold 20% for federal tax; you then have 60 days to deposit the full amount — including the withheld 20% from other funds — or that piece becomes a taxable, penalty-exposed distribution. Always do a direct rollover.
• Underrating longevity risk. The lump sum can be exhausted. The pension cannot. If you live to 95, the monthly check that “looked small” at 55 is the asset that kept you solvent.

The lever that decides it

Calculate one number before anything else: annual pension divided by lump sum. If the implied rate is under ~5%, the pension is paying you more than you can safely replicate — keep it. If it’s over ~6%, the lump sum is competitive and the decision turns on your health, your other guaranteed income, and your stomach for sequence risk. Dave’s 6.6% looks like a green light for the cash until you remember it is inflated by an early-retirement subsidy the lump sum throws away — which is exactly why, at 55, the monthly pension is the stronger hand. Pull your plan’s reduction-factor table, confirm whether a subsidy is in play, and let the division — not the size of the check — make the call.