Pension Lump Sum vs Annuity

Defined-benefit pensions are an endangered species. As of 2025, only about 13% of private-sector US workers have access to one (down from 60% in 1980). Among those that still exist, many plan sponsors are actively trying to offload the liability — by offering you a lump sum buyout. From the company's perspective, this is risk transfer: they hand you a check, you take on the longevity risk and investment risk that they used to bear.

The implied return is the key number. If your plan offers $750K instead of $4500/month for life, the math is: $4500 × 12 = $54K/year forever. To match that annuity, your $750K needs to earn approximately $54K / $750K = 7.2% per year, every year, for life. That's before tax, before sequence-of-returns risk, before the survivor benefit. If the implied return is higher than what you can confidently earn on bonds (~5% today, less in low-rate environments), the annuity is usually the better deal. If the implied return is 5% or lower, the lump sum starts to make sense.

Survivor benefit value is real. A typical joint-and-50% survivor option pays the surviving spouse half the pension for life. For a married couple where one spouse outlives the other by 5-10 years, that survivor benefit can be worth $200K-$500K in cumulative payments beyond the primary annuitant's death. Lump sum has no equivalent — once you take the cash and invest it, the balance is whatever it is when you die.

COLA is a make-or-break feature. Most private pensions don't have COLAs, but most public- sector and union pensions do. A 2.5% annual COLA roughly doubles the value of the annuity over 25 years. If your pension has a COLA, the implied return calculation needs to compare to a much higher target (probably 8-9%, not 6-7%). If your pension doesn't have COLA, inflation quietly destroys 30-40% of its real value over a 25-year retirement.

The PBGC backstop matters. Private-sector pensions are insured by the Pension Benefit Guaranty Corporation, but only up to a cap (~$70K/yr at age 65 in 2025). If your monthly pension exceeds that, the portion above the cap is at risk if your plan sponsor goes bankrupt. For high-pension recipients with shaky employers, the lump sum eliminates this single-payer risk by converting to broadly-diversified investments. For most people with more modest pensions or strong employers, this isn't a real concern.

Behavioral risk is the elephant in the room. The cleanest case for the lump sum is mathematical: implied return is low, you're a disciplined investor, you have other income to cover essentials. The strongest case for the annuity is behavioral: a $750K check tempts most people into bigger lifestyle spending or worse investment decisions than $54K/year would. The annuity is paternalistic and that's often the point. Studies consistently find that annuitants run out of money less often than equivalently-funded lump-sum recipients, even when the math favored the lump sum.