Pension vs Lump Sum Calculator
Compare the total lifetime value of monthly pension payments against investing a one-time lump sum payout. Use it when your employer or pension plan offers both options at retirement.
Last updated: May 2026
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About this calculator
Compare two retirement income strategies on a like-for-like basis by discounting both to present value. A pension is an annuity — a stream of monthly payments for life — and its present value is: PV_pension = monthlyPension × 12 × (1 − (1 + r)^−N) / r, where r = investmentReturn / 100 (the discount rate, typically your expected portfolio return) and N = lifeExpectancy − currentAge. This is the standard present-value-of-annuity formula used by every actuary and pension consultant. The pension is then scaled by pensionFactor — 1.0 for a single-life annuity, 0.9 for a 50% joint-and-survivor benefit, or 0.85 for a 100% joint-and-survivor benefit — to reflect the reduced payment that comes with survivor coverage. Net advantage = PV_pension × pensionFactor − lumpSum. A positive result means the pension is worth more in today's dollars than the lump sum offer; negative means the lump sum is the better deal. A quick sanity check — the '6% rule' — is that if the annual pension payout exceeds 6% of the lump sum offer, the pension is usually competitive at typical discount rates; below 6%, the lump sum tends to win.
How to use
Assume a $2,500/month single-life pension, a $400,000 lump sum offer, current age 60, life expectancy 85, and a 6% discount rate (your expected investment return). Step 1 — Years of payments: N = 85 − 60 = 25. Step 2 — Discount factor: (1 + 0.06)^−25 = 1 / 1.06^25 = 1 / 4.2919 ≈ 0.2330. Step 3 — Annuity factor: (1 − 0.2330) / 0.06 = 0.7670 / 0.06 ≈ 12.7834. Step 4 — Present value of the pension: $2,500 × 12 × 12.7834 = $30,000 × 12.7834 ≈ $383,503 (single-life uses factor 1.0; joint-50% multiplies by 0.9, joint-100% by 0.85). Step 5 — Net advantage: $383,503 − $400,000 = −$16,497. The lump sum is worth slightly more in today's dollars at a 6% discount rate. Sanity check: $30,000 / $400,000 = 7.5% — above 6%, so the pension is competitive; dropping the discount rate to 4% (matching a bond-heavy portfolio) flips the result and the pension wins by roughly $70,000.
Frequently asked questions
How do I decide whether to take a pension annuity or a lump sum at retirement?
The decision hinges on your life expectancy, investment discipline, the lump sum's implicit interest rate (the rate at which the pension and lump sum are equivalent), and your need for guaranteed income. If you are in poor health or have a family history of shorter lifespans, the lump sum is often more advantageous. If you value predictable, inflation-linked income and worry about outliving your assets, the pension provides security no market return can guarantee. Many financial planners suggest comparing the pension's internal rate of return to safe bond yields as a baseline.
What happens to my pension payments if I choose a joint-and-survivor benefit?
A joint-and-survivor (J&S) option reduces your monthly pension payment in exchange for continuing a portion of it to your spouse after your death. A 50% J&S option pays your surviving spouse half your pension amount and typically reduces your own payment by around 10%. A 100% J&S option continues the full payment to your spouse but may reduce your payment by 15% or more. The right choice depends on the age and health of both spouses and whether the survivor would have other income sources.
What investment return do I need to make the lump sum better than the pension?
The break-even return is the rate at which the invested lump sum's future value exactly equals the total lifetime pension payments. You can find it by setting lumpSum × (1 + r)^years = annualPension × years and solving for r. If that break-even rate is below what you realistically expect to earn (adjusted for risk), the lump sum is likely the better financial choice. Conversely, if achieving that return requires taking significant investment risk, the pension's guaranteed income may be worth the lower expected value.