📊 FinCalc Lab

🏛️ Pension Lump Sum vs Annuity Calculator

A pension buyout offer compresses a lifetime of monthly checks into one number — and the company making the offer profits when you take it cheap. The honest test: what return would the lump sum have to earn to pay you the same checks for as long as you're likely to live? This calculator computes that hurdle rate and both futures.

The one number that cuts through the fog

Comparing $300,000 today against $2,000 a month for life is comparing apples to a subscription. The clean translation is the implied return (an internal rate of return): the annual yield the lump sum would have to generate, every year until your planning age, to write you the same checks. If that hurdle is 6.5% and your realistic after-fee expectation for a retirement portfolio is 5-5.5%, the pension is paying you more than the market plausibly will — decline the buyout. If the hurdle is 3.5%, the offer is generous (or the pension small); take the money. Everything else — payout ratios, break-even ages — is this number wearing different clothes.

Why the deck is often stacked toward "take the lump"

Companies offer buyouts to shed pension liability, and the offer is calculated under IRS-prescribed rates — when interest rates are high, the mandated present value shrinks, so lump sums offered in high-rate years are systematically smaller relative to the checks they replace. The offer letter also frames the number to look enormous ($300,000!) against a modest-sounding monthly figure, exploiting the well-documented tendency to undervalue annuities. And the risk transfer is total: decline the buyout and longevity risk, market risk and management burden stay with the plan; accept it and all three are yours. None of this means the lump is wrong — it means the burden of proof sits on the buyout, and the implied return is how you check it.

What favors the pension (annuity)

  • You (or your spouse) might live long. The pension pays until death — the scenario that bankrupts self-managed money is exactly the one where the annuity shines. A 65-year-old couple has better-than-even odds one of them reaches 90.
  • The implied return beats your honest portfolio expectation — commonly the case for long-tenured employees whose formulas were set in generous eras.
  • You want a guaranteed income floor. Pension + Social Security covering the baseline budget converts the rest of the portfolio into genuinely spendable, risk-tolerant money — and neutralizes sequence-of-returns risk on the necessities.
  • Behavioral honesty: if a six-figure account would get raided for kitchens, kids and market panics, the pension's inaccessibility is a feature. PBGC insurance backstops private pensions (up to ~$7,100/month at 65 for single-employer plans in 2025), so "the company might fail" is a smaller risk than it sounds — below that ceiling.

What favors the lump sum

  • Health or family history points shorter. The annuity's value collapses if payments stop early; the lump is inheritable — roll it to an IRA and it passes to heirs, while most single-life pensions die with you.
  • No or weak survivor benefit. Joint-and-survivor options cut the check 10-20%; if the pension is single-life and your spouse would be stranded, the lump (or the lump + a term policy sized with the life insurance calculator) can protect them better.
  • No COLA. Most private pensions are frozen nominal — at 2.5% inflation, the check loses ~40% of its purchasing power over 20 years. A portfolio can at least try to grow; the inflation calculator shows the erosion.
  • The implied return is low and you have the discipline (or an advisor) to invest the rollover sensibly — model the drawdown with the withdrawal calculator.

Practical notes before you sign anything

Roll, don't cash. A lump sum taken as a check is ordinary income in one year — a six-figure tax detonation plus early-withdrawal penalty if you're under 59½. A direct rollover to an IRA is tax-free and preserves every option. Price the annuity externally: get a quote for a commercial single-premium immediate annuity paying the same monthly amount — if insurers charge more than your lump offer, the pension is underpriced (keep it); if they charge less, the buyout is rich. Decide jointly: the survivor-benefit election is usually irrevocable and requires spousal consent for good reason. And remember the decision isn't all-or-nothing at the household level — many couples keep one pension as the income floor and roll the other, and coordinate the whole stack with the Social Security claiming decision, which is itself the cheapest inflation-adjusted annuity money can't buy more of.

Frequently asked questions

Is there a rule of thumb for judging a lump sum offer?

The payout ratio: first-year pension divided by the lump. At 65, offers below ~5.5-6% generally favor taking the pension (the checks are cheap to decline); above ~7%, the annuity is hard to replicate and worth keeping. But the implied-return calculation this tool runs is strictly better — the rule of thumb ignores COLAs, start ages and your actual planning horizon.

What happens to my pension if the company goes bankrupt?

Private single-employer pensions are insured by the PBGC up to a cap — about $7,100/month for a 65-year-old single-life annuity in 2025 (lower for early retirement or survivor options). Benefits under the cap have historically been paid in full. If your check would exceed the cap, bankruptcy risk becomes a real argument for the lump sum; below it, much less so.

Can I take the lump sum and buy my own annuity?

Yes — that's the cleanest market test. Get SPIA quotes for the same monthly income: if $280,000 buys what your $300,000 lump replaces, take the lump, spend $280,000 on the annuity (or don't), and pocket the difference. If it costs $340,000, your pension is underpriced — keep it. Quotes are free and this comparison takes an afternoon.

How is the survivor benefit decision related?

Declining the buyout usually means choosing single-life (bigger check, stops at your death) vs joint-and-survivor (10-20% smaller, continues for your spouse). If you take the smaller joint check, you're effectively buying life insurance from the pension plan; occasionally buying term insurance with the single-life difference protects the spouse more cheaply — but only while insurable, and the pension's version never lapses.

Do I owe tax on a pension lump sum?

Not if it's directly rolled into an IRA or 401(k) — the rollover is tax-free and the money keeps growing tax-deferred until withdrawal (then taxed as ordinary income, with RMDs eventually applying). Taken as cash, the entire amount is taxable income that year, usually at painfully stacked rates, plus a 10% penalty under 59½. Virtually everyone who takes the lump should roll it.

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Further reading

Changing Jobs? The Four Things You Can Do With Your Old 401(k) Leave it, roll it to the new plan, roll it to an IRA, or cash out — the real trade-offs of each, the direct-rollover rule that avoids a tax disaster, and who should pick which. Renting vs Buying a Home: The Honest Math Beyond 'rent is throwing money away' — the real costs on both sides, the break-even horizon, and how to decide based on your actual situation. When to Claim Social Security: The 62 vs 67 vs 70 Decision, Honestly Claiming age changes your Social Security check by up to 77% for life. How the reductions and credits work, what break-even really tells you, and who should claim early anyway. How Much Should You Spend on a Car? Rules of Thumb That Actually Work Practical guidelines for a sensible car budget — the 20/4/10 rule, why total cost dwarfs the sticker price, and how a car quietly drains wealth.

This calculator is for educational purposes only and does not constitute financial advice. Results are estimates based on the inputs and assumptions shown.