Pension Calculator

The defined-benefit formula

Most private and public pensions use a version of the same formula. Final average salary times years of credited service times a plan multiplier. The multiplier is typically between 1 and 2.5 percent per year of service. Public safety plans and some legacy corporate plans reach the high end. Newer plans, when they exist at all, tend to sit near the low end. Cost-of-living adjustments, integration with Social Security, and early-retirement reductions all layer on top of the base formula and are worth reading in the actual summary plan description before making decisions.

Why the lump-sum question shows up

More corporate plans now offer a one-time lump-sum window instead of a lifetime monthly benefit. The number is usually calculated using plan-specified interest rates and mortality tables. Higher rates produce smaller lump sums, and the interest-rate environment of the last several years has moved the math significantly. That is why the same person can be offered very different lump sums two years apart with an identical service history.

Present value is not the whole answer

The calculator's present-value comparison discounts future monthly payments back to today at a chosen rate. If the annuity's present value is meaningfully higher than the lump sum, that suggests the plan is paying above what a portfolio might be expected to replicate. If the lump sum is higher, the plan is essentially buying the retiree out on favorable terms. Neither answer settles the decision. The annuity carries longevity insurance the lump sum does not have, and the lump sum carries control the annuity does not have.

Longevity, inflation, and survivor risk

A fixed monthly pension is a rare thing. It pays until death regardless of how long the retiree lives. That is enormously valuable if the retiree lives to 95, and less valuable if they do not. Inflation, however, tends to erode that fixed benefit over a 20 to 30 year retirement. The lump sum, invested reasonably, retains a shot at keeping up. On the survivor side, most plans require the joint-and-survivor election unless the spouse waives it in writing. That election lowers the monthly benefit in exchange for continuing income after the first death.

PBGC insurance and plan health

Private single-employer plans are backed by the Pension Benefit Guaranty Corporation up to a per-participant cap. That is meaningful protection but not unlimited protection for high earners. A retiree with concerns about long-term plan solvency and a benefit above the PBGC cap may reasonably prefer the lump sum for that reason alone.

Rollover plus SPIA as a middle path

One overlooked option is to take the lump sum, roll it into an IRA, and use a portion to purchase a single premium immediate annuity that replicates part of the lifetime income. That preserves flexibility on the balance, restores the longevity floor, and can produce competitive payouts at older ages. The immediate-annuity payout tool linked below is a starting point for that half of the analysis.