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Finance Calc Kit
Retirement

Pension Calculator

Compare lump sum vs monthly pension, single life vs joint survivor, and working longer options.

Pension analysis

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Option 1: Lump sum offer

$
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Option 2: Monthly pension

$
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Present value of monthly pension

$1,000,278.02

Lump sum offer

$800,000.00

Better value at 5% discount rate

Monthly pension ($200,278.02 advantage)

Total nominal pension payouts

$1,696,780.91

Remaining lump sum at age 85

$0.00

If you withdraw the pension equivalent each year, the lump sum is exhausted by age 80 at a 5% return.

Year-by-year projection

AgeAnnual pensionDiscounted PVLump sum balance
66$60,000.00$57,142.86$777,000.00
67$62,100.00$56,326.53$750,645.00
68$64,273.50$55,521.87$720,690.08
69$66,523.07$54,728.70$686,875.35
70$68,851.38$53,946.86$648,925.17
71$71,261.18$53,176.19$606,547.19
72$73,755.32$52,416.53$559,431.47
73$76,336.76$51,667.72$507,249.45
74$79,008.54$50,929.61$449,652.95
75$81,773.84$50,202.04$386,273.06
76$84,635.93$49,484.87$316,718.99
77$87,598.18$48,777.95$240,576.85
78$90,664.12$48,081.12$157,408.37
79$93,837.36$47,394.25$66,749.56
80$97,121.67$46,717.18$0.00
Showing first 15 of 20 years
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Understanding pension payout options

When you leave a job with a defined benefit pension, you usually face an irreversible choice: take a one-time lump sum or accept guaranteed monthly payments for life. If you choose monthly income, you may also pick a single-life benefit or a joint-and-survivor benefit that continues paying your spouse after your death. This pension calculator compares those paths using life expectancy, a discount rate, and present value math so you can see whether the lump sum offer is fair relative to the annuity.

For broader retirement savings projections outside a pension plan, pair this tool with the 401(k) calculator, the IRA calculator, and the investment calculator. For annuity mechanics and payout tables, see the immediate annuity calculator and annuity calculator, and the variable annuity calculator for market-linked contracts with fee drag modeling.

Lump sum vs monthly pension

A lump sum gives you immediate control of the full account balance. You can invest it, leave a legacy, or cover large one-time expenses, but you bear investment risk and longevity risk. A monthly pension transfers those risks to the plan and provides a predictable income stream, often with a cost-of-living adjustment (COLA) that raises payments each year.

The fairest apples-to-apples comparison discounts future pension checks to today's dollars using a discount rate that reflects your opportunity cost of capital, expected portfolio return, or a conservative bond-like yield. If the present value of the monthly pension exceeds the lump sum offer, the annuity is mathematically richer at that discount rate. If the lump sum is larger, you may prefer the cash unless you value the guarantee highly or expect to live well beyond average life expectancy.

PVannuity=∑t=1nPt(1+r)twhere Pt=Monthly Pension×12×(1+g)t−1PV_{\text{annuity}} = \sum_{t=1}^{n} \frac{P_t}{(1+r)^t} \quad \text{where } P_t = \text{Monthly Pension} \times 12 \times (1+g)^{t-1}

In the formula above, $n$ is retirement years (life expectancy minus retirement age), $r$ is the annual discount rate, and $g$ is the annual COLA. The calculator also simulates whether investing the lump sum and withdrawing the pension equivalent each year would leave a remaining balance at your life expectancy.

Single life vs joint and survivor

A single-life pension pays the highest monthly amount, but all payments stop when you die. A joint-and-survivor option pays a reduced monthly benefit while you are alive and continues paying your spouse (often 50%, 75%, or 100% of the original amount) for as long as the survivor lives. ERISA plans that offer a qualified joint and survivor annuity must obtain spousal consent before paying a single-life benefit to a married participant.

Compare single-life and joint options using both total nominal payouts over expected lifetimes and present values at your discount rate. Joint benefits cost more when a younger spouse is likely to outlive the retiree, even though the monthly check is smaller. Use realistic life expectancy assumptions for both spouses rather than assuming identical longevity.

Worked example: lump sum vs monthly pension

Suppose you retire at 65 with a life expectancy of 85, a $800,000 lump sum offer, and a $5,000 monthly pension with no COLA. At a 5% discount rate over 20 years, the present value of the pension is about $747,732. The lump sum is slightly higher, so the cash offer wins on pure present value, though the monthly pension still provides insurance against living past 85. Add a 3.5% COLA and the present value rises materially because later checks are larger.

  1. Set retirement age and life expectancy to match your planning horizon.
  2. Enter the lump sum offer and expected investment return for the cash-out path.
  3. Enter the monthly pension and COLA from your benefit estimate statement.
  4. Compare present value of the annuity to the lump sum at your discount rate.

Choosing a discount rate and life expectancy

The discount rate should reflect how you would invest the lump sum. Conservative retirees might use high-quality bond yields (4% to 6%), while balanced investors might use 6% to 8%. Life expectancy can be based on Social Security period life tables, insurer mortality tables, or personal health factors. Longer assumed lifespans increase the present value of monthly pensions and favor joint-and-survivor options when a spouse is younger.

For deeper present value modeling with custom cash flows, use the net present value calculator or the growing annuity calculator.

Frequently asked questions

Is it better to take the lump sum or monthly pension?
It depends on the offer, your discount rate, life expectancy, and risk tolerance. Compare the present value of the monthly pension to the lump sum at a rate you would earn on the cash. If the annuity present value is higher, the monthly payments are mathematically richer; if the lump sum is higher, you may still prefer the pension for guaranteed lifetime income.
What happens to my pension if I die early?
Under a single-life benefit, payments stop at your death and nothing goes to survivors unless you bought separate coverage. Under joint and survivor, your spouse continues receiving the reduced benefit for life. Model both spouses' ages and life expectancies in the joint comparison mode.
How does COLA affect pension value?
A cost-of-living adjustment increases each year's payment by a set percentage. Over a 20-year retirement, a 3.5% annual COLA can raise the final monthly check by more than 80%, which significantly increases both total payouts and present value.
What discount rate should I use?
Use a rate that reflects how you would invest the lump sum after taxes and fees. Many retirees use 4% to 6% for conservative portfolios or 6% to 8% for balanced allocations. Sensitivity-test a few rates because small changes can shift which option looks better.
Are pension payout decisions reversible?
Generally no. Once you elect a lump sum or a specific annuity form, the choice is permanent for that benefit. Review your Summary Plan Description and consider speaking with a fiduciary advisor before signing election forms.
Are results stored on your servers?
No. All calculations run in your browser. Changing inputs updates the page URL so you can bookmark or share a scenario without sending data to a server.

Resources and references

The formulas and methods in this calculator were checked against these independent sources.