Pension CalculatorFree online financial calculator — instant results, no sign-up
Compare a lump sum with a monthly pension.
Estimates only, based on the inputs and assumptions shown. This is not financial, investment, tax, or legal advice. Prices, rates and local rules may change; crypto scenarios do not predict returns. Confirm important decisions with a qualified professional.
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About the Pension Calculator
This calculator compares an immediate lump-sum payout with a recurring monthly pension stream over a set retirement horizon. It computes the present value of the lifetime monthly payments based on an assumed annual investment return. Individuals facing a pension buyout or retirement distribution decision can use it to determine which option is financially superior under their assumptions.
- Lump sum offer
- The one-time cash buyout offered today instead of regular pension checks, entered in dollars (e.g., $50,000 to $2,000,000).
- Monthly pension
- The fixed monthly income payment provided by the pension plan, entered in dollars (e.g., $500 to $10,000).
- Years receiving
- The anticipated number of years you expect to collect payments, typically based on life expectancy (e.g., 10 to 40 years).
- Investment return
- The expected annual discount or investment return rate, entered as a percentage (e.g., 2% to 10%).
Formula and method
PV = PMT × (1 − (1 + r)^(-n)) / r
- PVPresent value of the monthly pension payments
- PMTMonthly pension payment amount
- rMonthly interest rate, calculated as the annual investment return percentage divided by 1,200
- nTotal number of payment periods, calculated as years receiving multiplied by 12
The calculator converts the annual investment return to a monthly rate and the total years to total monthly periods. It evaluates the standard present value formula for an ordinary annuity to determine what the stream of monthly payments is worth in today's dollars. Finally, it compares this present value directly against the lump-sum offer to determine the higher-value option.
Worked example
These are the calculator's starting values and the results it actually produces for them.
Inputs
- Lump sum offer300000 $
- Monthly pension1800 $
- Years receiving25
- Investment return5 %
Results
- Present value of pension$307,908.08
- Better choiceMonthly pension
How to use the Pension Calculator
- 1Convert the annual return percentage to a monthly decimal interest rate by dividing by 1,200.
- 2Multiply the planned number of receiving years by 12 to find the total payment periods.
- 3Calculate the present value of the annuity using the monthly payment, monthly rate, and total periods.
- 4Compare the calculated present value to the lump sum offer; if the present value exceeds the lump sum, the monthly pension is designated the better choice.
Reading your result
The 'Present value of pension' represents how much capital you would need to invest today at your assumed return rate to replicate the monthly pension payouts. If the present value is greater than the lump-sum offer, the tool labels the monthly pension as the better choice. If the lump sum exceeds this present value, taking the lump sum provides greater financial value under the entered rate and timeframe.
Limitations
The calculation assumes a constant investment return rate and level monthly payments, ignoring cost-of-living adjustments (COLA) and inflation. It also does not factor in federal or state income tax differences between taking a lump sum and annuity distributions, nor does it account for longevity risk or survivor benefit options.
Common questions
How does the investment return rate affect the comparison?+
A higher assumed investment return lowers the present value of the monthly pension, making the lump-sum offer look more attractive because you assume you can invest the lump sum and earn higher returns. Conversely, a lower assumed return increases the present value of guaranteed monthly payments.
What happens if I live longer than the entered years receiving?+
If you live longer than estimated and your pension is a guaranteed lifetime annuity, the total value received from the pension increases, making the monthly pension even more valuable than calculated. If you take the lump sum, you carry the risk of depleting the funds if you outlive your projections.
Does this calculation consider taxes on the lump sum?+
No, this tool compares pre-tax amounts directly. Taking an immediate cash lump sum can lead to significant upfront tax liabilities unless rolled directly into a qualified account like a traditional IRA, whereas monthly pension distributions are taxed incrementally as income.
Does the calculator save my information?+
Calculations run in your browser. While signed in, inputs and results are automatically recorded in account history; saving a result creates a separate saved record.
Further reading
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Results are estimates for informational purposes and are not financial, medical or legal advice.