Pension Lump Sum vs Annuity

Take the monthly check or the cash? What the discount rate, the PBGC guarantee and the survivor election actually do to the answer.

Most people meet this decision once, on a form with a deadline, and the form does not explain what it is asking. The plan offers a monthly check for life, or a single payment now. This spoke sits under the Retirement hub.

Two different promises

• A pension (defined benefit) promises a set monthly income for life. The employer carries the investment and longevity risk.
• A 401(k) (defined contribution) promises only a pot of money. You get the control, the growth and the inheritable balance — and the market risk, the sequence risk and the risk of outliving it.

Neither is better. They allocate risk differently, and each has one weak point. The 401(k)'s weak point is that everything depends on you. The pension's weak point is the one almost nobody is told about.

Your pension is almost certainly not inflation-adjusted

Automatic cost-of-living increases are a public-sector feature. In private-sector plans they are the exception. The last time the Bureau of Labor Statistics published a clean side-by-side, 54% of public pension participants had an automatic COLA against 4% of private participants (1993–94 data — old, and we flag it as old, but nothing since has reversed it).

The federal backstop settles the question for anyone whose plan fails. The PBGC states it plainly: "There is no cost-of-living adjustment under the law." The insurer of last resort for private pensions pays a flat nominal check, forever.

That matters more than most retirees expect, because a flat check does not fall in a crash — it fades. Here is what a flat $3,000/month pension is worth in today's money as a retirement runs on. The inflation rates are assumptions, not forecasts; we do not forecast, so we show a range and let you pick.

Illustration: a level $3,000 monthly benefit, discounted at a constant rate. Your plan's terms are what count — read the summary plan description.

At 3% inflation the "guaranteed income for life" has lost roughly 60% of its purchasing power by year 30 — the $3,000 check still arrives, and it buys what about $1,236 buys today. The guarantee was always nominal. Nobody lied to you; nobody explained it either.

Two consequences follow, and they are the point of this page:

1. It changes the annuity-vs-lump-sum maths. A flat nominal annuity is worth less than an equally sized inflation-linked one, and the gap widens with your life expectancy.
2. It changes what your Social Security is for. Social Security is indexed — benefits are adjusted annually for inflation, and 2026's increase was 2.8%. If your pension is flat, Social Security is the only inflation-protected income most households will ever have, which strengthens the case for delaying the claim toward age 70.

Lump sum vs annuity: the arithmetic behind the offer

A lump sum is not a gift. It is the present value of the annuity you are giving up. Federal law (IRC §417(e)(3)) sets a floor: the payout must be at least the actuarial present value of the monthly benefit, computed with published segment rates and a mortality table.

The discount rate does most of the work — and it is the assumption you have the least control over.

A simplified 25-year certain stream, ignoring mortality and any survivor benefit. Real plan lump sums use the IRS segment rates and mortality table. The point is the shape, not the cents.

The same pension is worth about $207,000 less at 7% than at 3%. That is why lump-sum offers shrink after interest rates rise, and it is why "the lump sum looks small this year" is often a statement about bond yields, not about your employer's generosity.

Two questions fall out of this:

• What return would you have to earn to replace the annuity? If you took the lump sum and bought your own $3,000/month for 25 years, you would need to earn roughly the discount rate embedded in the offer — after fees, after taxes, and while withdrawing. That is a much harder task than earning it in a chart.
• How long do you have to live for the annuity to win? Ignoring investment returns entirely, a $500,000 lump sum against $3,000/month is about 14 years of payments before you are even. Add returns and the break-even stretches; add a long life and the annuity keeps paying long after the lump sum would have run dry. That is the whole product: the annuity is longevity insurance, and insurance is worth most to the person who ends up needing it.

What the PBGC guarantees, and what it does not

If the plan fails and PBGC takes it over, you are not left with nothing — but you are not left with everything either.

• The maximum guarantee is capped by law. PBGC publishes a maximum monthly table for each plan-termination year. The cap rises with the age you start payments, and it is reduced if your benefit form includes a survivor annuity.
• The cap is frozen at the plan's termination date — and if the sponsor was in bankruptcy, it can be pulled back to the bankruptcy filing date.
• Recent benefit increases are only partly covered. If the plan was created or amended to raise benefits within five years of termination, PBGC guarantees the greater of 20% of the increase or $20/month for each full year it was in effect.
• COLAs are not guaranteed at all. "PBGC benefits are not increased for cost-of-living adjustments (COLAs)."
• The guarantee ends when you are paid out. If the plan terminates in a standard termination and buys you an annuity from an insurer, or hands you the lump sum, PBGC's role is over. A state guaranty association may cover some of an insurer annuity, with limits that vary by state.

So the pension's safety net is real, capped, nominal, and — for anyone whose benefit is large — incomplete. If your promised benefit is well under the cap, the guarantee is a genuine comfort. If it is well over, the guarantee is a partial one, and that belongs in your decision.

Check the plan's funding before you check anything else

Your plan must send you an annual funding notice showing its funded percentage — plan assets divided by plan liabilities. It is the closest thing you have to a solvency reading on the promise. A well-funded plan at a stable employer is a very different proposition from a thinly funded plan at a struggling one, and the same lump-sum offer should not get the same answer in both cases.

The survivor election is the decision inside the decision

If you are married, a defined benefit plan must pay you as a qualified joint and survivor annuity — a benefit that continues at 50% to 100% to your surviving spouse — unless your spouse gives written consent to something else, witnessed by a notary or a plan representative.

A single-life annuity pays more per month. It also pays nothing the day you die. Households sign that waiver every year to get a bigger check, and the surviving spouse discovers what it meant a decade later. If one of you has meaningfully longer life expectancy, or the pension is a large share of household income, the survivor election is likely the highest-stakes box on the form — larger than the lump-sum question itself. Note too that PBGC's maximum guarantee is lower for survivor forms, so the protection and the cap move together.

What each option actually hedges

Read that table honestly and the answer stops being a slogan. The annuity hedges the risk you cannot insure any other way (longevity) and leaves you exposed to the one that compounds (inflation). The lump sum does exactly the reverse.

Lean toward the annuity if your health and family history point to a long life, if you have little other guaranteed income, if the pension is well inside the PBGC cap, and if handling a seven-figure balance for thirty years sounds like a burden rather than an opportunity.

Lean toward the lump sum if you have serious health issues, if you already have a strong inflation-linked floor from Social Security, if the plan's funding is shaky, if you want the balance to reach heirs, or if the offer's implied discount rate is high enough that you are being paid well to take the risk.

If neither list describes you cleanly, that is not a failure of the analysis. It means the decision is close — and when it is close, the survivor election and the inflation exposure should break the tie, not the size of the headline number.

If you have a 401(k) instead

You can manufacture some of what a pension gives, without buying the flat-nominal problem wholesale:

• Delay Social Security. It is the only large, inflation-adjusted, government-backed lifetime income most households can buy, and waiting raises the base the COLA compounds on. See Social Security timing and the break-even tool.
• Annuitize part, not all. Covering essential spending with guaranteed income leaves the rest of the portfolio free to do the inflation work.
• Hold a cash buffer so a bad market cannot force a sale. See the sequence-risk tool.

Run your own numbers in the retirement checkup, and read inflation and retirement before you decide that a flat check is a safe one.

Key takeaways

• A private pension is almost never inflation-adjusted, and the PBGC guarantee explicitly does not cover COLAs. At 3% inflation a flat check loses roughly 60% of its purchasing power over 30 years.
• The lump sum is the present value of the annuity. The discount rate does most of the work — the same pension is worth far less when rates are high.
• The PBGC guarantee is capped, fixed at the plan's termination date, reduced for survivor forms, and ends entirely once you are paid a lump sum or handed an insurer annuity.
• The survivor election is usually the most consequential choice on the form, and the least understood.
• The annuity hedges longevity and exposes you to inflation. The lump sum does the opposite. Which is right depends on your health, your other guaranteed income, and the plan's funding — not on a rule of thumb.

Educational only — not financial advice.