Pension vs Lump Sum Calculator
When a pension plan offers you a choice between a monthly pension for life or a single lump sum, the decision comes down to present value. The present value of the pension is the amount you would need today, invested at a given rate, to replicate the monthly pension payments for your expected lifetime. If the pension PV exceeds the lump sum offer, the pension provides more value at that discount rate. Enter the pension amount, lump sum offer, expected years of payments, and discount rate to compare.
Present value of annuity formula
Monthly rate r = Annual Discount Rate / 12
n = Years * 12 (total monthly payments)
PV = Monthly Payment * [(1 - (1 + r)^(-n)) / r]
Pension advantage = PV - Lump Sum Offer
Implied rate: solve for r where PV = Lump Sum Offer
This is the standard present value of an ordinary annuity formula. Source: standard time-value-of-money methodology as described in the CFA Institute curriculum and FINRA investor education materials.
Key considerations beyond the numbers
- Health and longevity: if your health is poor, the lump sum may be more valuable. The pension wins if you live a long time.
- Guaranteed income: a pension provides income you cannot outlive. A lump sum invested poorly could run out.
- Inflation protection: some pensions have cost-of-living adjustments (COLAs). The calculator uses a fixed monthly payment.
- Survivor benefits: a joint-and-survivor pension reduces your payment but protects a spouse. Factor this into your decision.
- Pension plan solvency: private pensions are insured by the Pension Benefit Guaranty Corporation (PBGC) up to statutory limits.
Pension vs lump sum: frequently asked questions
How do I compare a pension to a lump sum?
Calculate the present value (PV) of all future pension payments using a discount rate. If the PV of the pension exceeds the lump sum offer, the pension is worth more. If the lump sum is higher, taking the cash may be advantageous, especially if you can invest it at a rate exceeding the implied rate in the pension.
What discount rate should I use?
A common approach is to use the expected long-term investment return you could achieve with the lump sum. Conservative investors use 4-5%; moderate investors use 6-7%. The IRS also publishes segment rates (30-year Treasury rates) that pension plans use internally. A lower discount rate makes the pension worth more.
Does my life expectancy matter?
Yes, critically. A pension pays for the rest of your life. If you die early, you collect few payments. The calculator lets you enter an expected number of years to receive the pension. The Social Security Administration publishes life expectancy tables by age and gender.
What about survivor benefits?
Many pensions offer a joint-and-survivor option that reduces your monthly payment but continues paying a percentage to your spouse after your death. This option increases the present value of the pension. This calculator calculates the single-life value; consult your plan documents for survivor benefit terms.
Are pension payments or the lump sum taxed?
Both are taxed as ordinary income in the year received (for pre-tax pensions and traditional rollover IRAs). A lump sum rolled into a traditional IRA is not immediately taxed. Pension payments are taxed as ordinary income each month. State tax treatment varies; consult a tax advisor.
Official sources
- IRS: Minimum Present Value Segment Rates (used by pension plans).
- Pension Benefit Guaranty Corporation: PBGC Insurance Coverage.
- Social Security Administration Life Tables: Period Life Table.
Reviewed by the CalculatorHub team, edited by James Graham, 14 June 2026. See our methodology.