Pension vs. Lump Sum Calculator
Compare your pension payout options - a monthly annuity versus a one-time lump sum - to see which delivers more lifetime value. Results are split into two clearly separated views: a primary simple break-even (cumulative pension payments catching up to the lump sum, no investment growth) and a secondary "If you invest the lump sum" view that shows the return you'd need to match the pension and the age at which an invested lump sum would run out paying the same income. Survivor payout options (50% / 75% / 100% J&S) are hidden by default; enable Show survivor payout options to include them.
What This Calculator Does
This calculator helps you compare a pension's monthly annuity payments against a one-time lump sum option to figure out which delivers more value over your retirement. Enter your pension details - the monthly benefit, any survivor benefit reduction, and the lump sum offer - and the calculator shows a clear side-by-side comparison.
The comparison accounts for present value, the assumed investment return on the lump sum, and the impact of survivor benefits on the monthly option. Small changes in these assumptions can flip which option comes out ahead, which is why it's important to test multiple scenarios.
For most people this is a one-time, irreversible decision - so it's worth analyzing carefully. If you're also deciding when to claim Social Security, the Social Security calculator can help you model both income sources together. If you're also weighing a housing decision in retirement, the home ownership vs. renting calculator can help you compare the long-term cost of owning versus renting alongside your pension income.
When This Matters
- You're approaching retirement and have been offered a lump sum buyout from your employer
- You're choosing between pension payout options at retirement
- You want to understand how long you'd need to live for the annuity to "win"
- You're modeling what you could do with the lump sum if you invested it instead
- You or your spouse has health considerations that affect your longevity outlook
How to Use This Calculator
- Set the pension start age, any COLA, and the monthly Single Life and 10 Year Certain & Life benefit amounts
- Enter the lump sum offer amount and the age at which you'd receive it
- Set Expected return if invested - the annual return you assume the lump sum would earn. Default is 5.5% (a typical 50/50 stocks-and-bonds blend)
- Adjust the longevity slider to reflect how long you expect to live
- In the Results area, compare the primary numbers for each option: total lifetime payments, payout rate (vs. the ~5-7% SPIA market benchmark), and simple break-even age (the age at which cumulative pension payments first equal the lump sum, ignoring investment growth)
- Scroll to the "If you invest the lump sum" section to see the required return to match the pension (color-coded against your expected return) and the age at which an invested lump sum would run out producing the same income
- Tick Show survivor payout options if you're comparing joint-and-survivor (50% / 75% / 100%) options; the chart, results, and spouse longevity slider will appear with them
- Stress-test the comparison by raising and lowering the Expected return and longevity values to see how the picture changes
Frequently Asked Questions
How do I decide between the pension annuity and the lump sum?
The right answer depends on your health and longevity, other guaranteed income sources, investment comfort level, and whether you have a spouse who needs survivor income. Someone in excellent health with no other guaranteed income might prefer the annuity; someone with health concerns or strong investment experience might prefer the lump sum.
What investment return should I assume for the lump sum?
A common range is 4-7% annualized, depending on your asset allocation. Higher assumed returns favor the lump sum; lower returns favor the annuity. Running the calculator at multiple return assumptions (conservative, moderate, aggressive) gives you a better sense of the range of outcomes rather than a single answer.
What is the simple break-even age?
It's the age at which cumulative pension payments first equal or exceed the lump sum amount. It ignores investment growth, so it answers the straightforward question: how many years of pension payments does it take to match the lump sum? If you live past that age, the pension has paid back more than the lump sum you would have received. "Never" means cumulative payments don't catch up before the end of your modeled plan horizon.
What does "If you invest the lump sum" show?
This secondary view assumes you take the lump sum and invest it at your Expected return if invested rate, then each year withdraw the same income the pension would have paid. It shows two things: the Required return to match pension (the annualized return the lump sum would have to earn to fully fund the pension's lifetime income - the IRR) and the Lump sum depletion age (the age at which the invested balance would run out at your assumed return). If the balance never depletes within your modeled plan, the lump sum "wins"; if it depletes before, the pension does.
What is the payout rate and what's a good one?
Payout rate is the annual pension divided by the lump sum amount. It's a quick sanity check against what commercial single-premium immediate annuities (SPIAs) offer on the open market. At age 65, SPIA payout rates typically run about 5-7%. A pension offer below roughly 4% is a relatively weak deal compared to the market; above 6% is strong. The calculator color-codes this row so you can see at a glance where your offer falls.
Should I take the survivor benefit option?
If you're married, giving up the survivor benefit for a higher monthly payment can leave your spouse with no income if you die first. The calculator shows the cost of the survivor benefit reduction and how it affects the comparison - for married couples, it's usually worth including unless the surviving spouse has strong independent income from other sources.
Is a pension lump sum taxable?
Yes - unless you roll it into an IRA or another qualified plan, the full lump sum is taxable as ordinary income in the year you receive it. Rolling it over avoids the immediate tax hit and preserves the tax-deferred growth. Most financial advisors recommend rolling over if you don't plan to spend it immediately. If you later consider converting those rolled-over funds to a Roth IRA, the Roth conversion calculator can help you estimate the tax cost.
Does a pension affect Social Security benefits?
Historically, a pension from a job where you didn't pay into Social Security (common in some government and public-sector jobs) could reduce your benefit through the Windfall Elimination Provision (WEP) or Government Pension Offset (GPO). The Social Security Fairness Act, signed in January 2025, repealed both - retroactive to January 2024 - so those pensions no longer reduce Social Security benefits. A pension still counts as ordinary income, though, which can increase how much of your Social Security is taxable.