Pension vs Lump Sum Calculator
Compare whether a monthly pension annuity or a one-time lump sum payout is worth more in today's dollars. Use this at retirement when your employer offers both options.
About this calculator
This calculator uses present value analysis to compare a lifetime pension stream against a one-time lump sum. The real (inflation-adjusted) investment return is: realReturn = ((1 + investmentReturn/100) / (1 + inflationRate/100)) − 1. The present value of the pension annuity is then: pvPension = annualPension × ((1 − (1 + realReturn)^−years) / realReturn), where annualPension = monthlyPension × 12 and years = lifeExpectancy − currentAge. If pvPension exceeds the lump sum offer, the pension provides more lifetime value in today's dollars. This approach accounts for the fact that a dollar received in the future is worth less than a dollar today. Longer life expectancy and lower investment returns favor the pension; shorter life expectancy and higher investment returns tend to favor the lump sum.
How to use
Assume a $2,000/month pension, a $400,000 lump sum offer, current age 62, life expectancy 85, 6% investment return, and 3% inflation. Step 1 — Years: 85 − 62 = 23. Step 2 — Real return: (1.06 / 1.03) − 1 ≈ 0.02913. Step 3 — Annual pension: $2,000 × 12 = $24,000. Step 4 — pvPension: $24,000 × ((1 − (1.02913)^−23) / 0.02913) ≈ $24,000 × 16.24 ≈ $389,700. Since $389,700 < $400,000, the lump sum is slightly more valuable. Enter your own numbers to see which option wins.
Frequently asked questions
When does taking a pension annuity make more financial sense than a lump sum?
A pension generally wins when you expect to live significantly longer than average, when market investment returns are expected to be modest, or when you value the security of guaranteed income. Since the pension's present value rises with each additional year of life, people in good health with family longevity often benefit most from the annuity. Low prevailing interest rates also increase the present value of future pension payments relative to the lump sum.
What happens to the lump sum if I invest it instead of taking the pension?
If you take the lump sum and invest it, your returns depend entirely on market performance, asset allocation, and discipline. The pension calculator compares the lump sum against the inflation-adjusted present value of guaranteed payments, assuming you invest the lump sum at the expected return rate. In practice, investment returns are uncertain and sequence-of-returns risk (poor returns early in retirement) can erode the lump sum faster than projected. The pension offers certainty; the lump sum offers flexibility and upside potential.
How does inflation affect the comparison between a pension and a lump sum?
Most traditional pensions pay a fixed nominal amount that does not adjust for inflation, meaning their real purchasing power declines each year. A higher inflation rate reduces the real value of future pension payments, which lowers the pension's calculated present value and makes the lump sum relatively more attractive. If your pension includes a cost-of-living adjustment (COLA), its real value is much better preserved and the pension becomes more competitive against the lump sum.