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Pension Lump Sum vs. Annuity Calculator

Determine whether a pension lump sum or lifetime annuity leaves you better off. See the break-even age, the annuity's implicit rate of return, and a year-by-year comparison of both strategies.

Inputs

$

The one-time lump sum amount your pension plan is offering

$

Gross monthly payment before any joint-life reduction

Your expected age at death. Use IRS or Social Security actuarial tables for guidance.

%

Expected annual return if lump sum is invested (before inflation, before tax)

%

Annual cost-of-living increase on the annuity, if any

%

% reduction in monthly payment for joint-and-survivor option (protects your spouse)

Results update as you type, and the address bar keeps your numbers so the link you share reopens this exact calculation.

Break-even age

81.7

At age 81.7, cumulative annuity payments first recover the nominal lump sum amount.

Detailed results
Lump sum invested value at break-even$1,355,759
Cumulative annuity at break-even$500,000
Annuity monthly income advantagePositive means annuity pays more per month than you could sustainably draw from the lump sum.-$1,082
Sustainable monthly draw from lump sumSustainable monthly draw from $500,000 over 20 years at 6.0% return$3,582
Annuity implicit IRRThe annual return the annuity implicitly provides relative to the lump sum, over your life expectancy.1.88%
Total lifetime annuity paymentsTotal payments received over 20 years (includes COLA if applicable)$600,000
Lump sum value at life expectancyLump sum value at life expectancy if fully invested and never withdrawn$1,603,568

What this result means

Break-even age: 81.7.

The annuity breaks even at age 81.7 — the payback point where cumulative annuity payments first recover the original lump sum. Since your life expectancy (85) exceeds the break-even age (81.7), the annuity is likely the better deal for longevity protection. However, the lump sum could sustain $1,082/month more in monthly income ($3,582/month vs. $2,500/month from the annuity). The annuity's implicit IRR is 1.9%: if you can invest the lump sum and consistently earn more than 1.9%, the lump sum wins mathematically; below that rate, the annuity delivers superior lifetime value.

Year-by-Year Pension Strategy Comparison

Shows cumulative annuity payments, lump sum invested value (not withdrawn), lump sum draw-down balance (withdrawing the annuity amount monthly), and the annuity's net advantage for each year.

Year-by-Year Pension Strategy Comparison. 20 rows, first 12 shown.
AgeCumulative Annuity ReceivedLump Sum Invested (not withdrawn)Lump Sum Draw-Down BalanceAnnuity Advantage
66$30,000$530,000$500,000-$500,000
67$60,000$561,800$500,000-$501,800
68$90,000$595,508$500,000-$505,508
69$120,000$631,238$500,000-$511,238
70$150,000$669,113$500,000-$519,113
71$180,000$709,260$500,000-$529,260
72$210,000$751,815$500,000-$541,815
73$240,000$796,924$500,000-$556,924
74$270,000$844,739$500,000-$574,739
75$300,000$895,424$500,000-$595,424
76$330,000$949,149$500,000-$619,149
77$360,000$1,006,098$500,000-$646,098

How this is calculated

break_even: find t (months) where  cumulative_annuity(t) ≥ lump_sum
  cumulative_annuity(t) = Σ[m=1..t]  PMT × (1 + COLA)^((m-1)/12)
  break_even_age = current_age + t / 12
implicit_IRR: binary search for annual r where  lump_sum = PMT × (1 − (1+r/12)^(-n)) / (r/12)
lump_sum_monthly_income = lump_sum × (r/12) / (1 − (1+r/12)^(-n))  [PV annuity formula, n = life_expectancy_months]
effective_monthly_annuity = monthly_annuity × (1 − joint_life_reduction)
lump_sum_fv_at_break_even = lump_sum × (1 + invest_return/12)^break_even_months  [not withdrawn]

Lump sum or lifetime income — the central tradeoff

When a pension plan offers you the choice between a one-time lump sum and a lifetime monthly annuity, you are essentially being asked to price your own longevity. Take the lump sum and you own the investment risk — but also the upside if markets perform well. Take the annuity and you hand that risk to the insurer in exchange for a guaranteed check every month, no matter how long you live.

How the break-even calculation works

The break-even age answers the most fundamental question: how long before the annuity has paid back what you gave up? This calculator defines break-even as the month when cumulative annuity payments first equal the original lump sum amount — your payback period.

The math iterates month by month, accumulating each payment (adjusted for COLA if applicable) until the running total crosses the lump sum. Divide those months by 12, add your current age, and you have the break-even age.

Note that this payback break-even is the most intuitive and conservative benchmark. A more aggressive comparison — when cumulative annuity exceeds the lump sum's compounded value (which keeps growing) — would require a far longer horizon and is shown separately in the chart and schedule. The annuity's implicit IRR addresses this from the other direction: at what return rate do the two strategies produce equivalent lifetime value?

If you live past the break-even age, you have recovered the lump sum in cash flow. The longer you live beyond it, the more you benefit from the annuity's guaranteed income stream. If you die before it, the lump sum route would have preserved more wealth for your heirs.

The implicit rate of return

A complementary way to evaluate the annuity is to find its implicit IRR — the annual return the lump sum would have to earn to exactly match total lifetime annuity payments. If you can reliably invest the lump sum and beat that rate, the lump sum is mathematically superior. If you cannot — or are unwilling to take that risk — the annuity wins.

This rate typically falls between 3% and 6% for most pension offers, which means that cautious investors, those uncomfortable with sequence-of-returns risk, or those without strong investment discipline often find the annuity to be the smarter choice.

Longevity risk is asymmetric

The annuity's greatest feature is also invisible in the math: it pays forever. A lump sum, no matter how well invested, can run out. This asymmetry is why financial planners often recommend the annuity for retirees without other guaranteed income sources, even when the break-even age looks unfavorable on paper.

Joint-and-survivor and COLA options

If you choose a joint-and-survivor option, your monthly payment is reduced — often by 10% to 25% — but continues at some fraction (typically 50% to 100%) after your death for a surviving spouse. The COLA provision, if available, increases payments annually with inflation, shifting the break-even calculation in favor of the annuity over time.

What this calculator does not model

This tool compares the pure financial math. It does not model income taxes (annuity payments are generally fully taxable; lump sum rollovers to an IRA are not), PBGC insurance limits on plan insolvency, or your specific estate planning goals. Those factors can materially shift the answer.

Assumptions

  • The lump sum is assumed to be rolled into a tax-advantaged account (e.g., IRA) and invested at the stated annual return; no taxes are deducted from growth.
  • Annuity payments are assumed to begin immediately at the current age entered.
  • The investment return on the lump sum is assumed constant across all years.
  • The break-even age represents the payback period: the month when cumulative annuity payments first recover the nominal lump sum amount. The chart and schedule separately show the lump sum's compounded invested value for a fuller comparison.
  • COLA, if entered, is applied to the effective (post-joint-reduction) monthly annuity, compounded monthly.
  • The draw-down balance tracks the lump sum if the same effective monthly annuity amount is withdrawn each month; it may reach zero before life expectancy for poor annuity or high return scenarios.
  • Implicit IRR is solved numerically using the present value of an annuity formula over the modeled life expectancy; if the annuity payments are insufficient to match the lump sum even at 0%, no positive IRR is reported.
  • State income taxes, federal income taxes on distributions, and investment fees are not modeled.
  • PBGC insurance limits and plan-specific rules are not modeled.
  • Joint-life continuation payments after the primary retiree's death are not tracked beyond the stated life expectancy.

Frequently asked questions

›What is longevity risk and why does it favor the annuity?

Longevity risk is the risk of outliving your money. A lump sum, regardless of how well you invest it, is finite — it can be depleted by a long retirement, poor investment returns, or unexpected expenses. An annuity eliminates this risk entirely: payments continue for as long as you (or your spouse, under a joint option) live. Actuarial data shows that a 65-year-old today has roughly a one-in-four chance of living past 90. If you reach your late 80s or beyond, the annuity almost always wins the financial comparison.

›Is my pension annuity insured if the plan goes bankrupt?

For private-sector defined benefit plans in the United States, the Pension Benefit Guaranty Corporation (PBGC) insures a portion of your benefit if your employer's plan becomes insolvent. The guaranteed maximum changes annually; as of 2024, it is approximately $7,697 per month for a 65-year-old retiree under a single-employer plan. Government pensions (federal, state, local) are not covered by the PBGC but are typically backed by the full faith of the sponsoring government entity. If your pension benefit exceeds the PBGC cap, the lump sum — if rolled into an IRA — may offer more security against plan insolvency.

›How does the joint-and-survivor benefit affect my choice?

A joint-and-survivor (J&S) option reduces your monthly payment in exchange for continuing payments to your spouse after your death, typically at 50%, 75%, or 100% of your benefit. The reduction makes the break-even age longer, since you receive less per month. However, if your spouse is younger or in better health, the J&S option can be highly valuable — providing income well into the future. Compare this against the lump sum option's ability to leave assets to a spouse through inheritance, keeping in mind that the lump sum's estate value depends on how much is spent before your death.

›How is the pension annuity different from Social Security?

Both are lifetime income streams, but they differ in important ways. Social Security benefits are inflation-adjusted (COLA) each year and are backed by the federal government. Most private pension annuities are fixed (no COLA), although some plans offer a partial COLA option. Social Security also has survivor benefit rules that differ from pension J&S options, and its claiming age (62–70) directly affects the monthly amount in a way that pension annuity terms typically do not. If you have substantial Social Security income, the additional longevity protection of the pension annuity may matter less, potentially making the lump sum more attractive.

›What investment return assumption should I use for the lump sum?

This is the most consequential input in the analysis. A higher assumed return makes the lump sum look better; a lower return favors the annuity. A common real-world benchmark is to use the 10-year Treasury yield plus a modest equity risk premium — roughly 5%–7% for a diversified portfolio. Importantly, you should think about the after-tax, after-fee, after-inflation return you can realistically sustain, not just the headline market return. Many retirees find that fees, taxes, and behavioral mistakes bring realized returns well below theoretical benchmarks.

›Does a COLA provision on the annuity change the math significantly?

Yes, significantly. Even a 2% annual COLA means payments roughly double over 35 years. This shifts the break-even age earlier — sometimes by 5 to 10 years — and sharply increases the annuity's implicit IRR. If your pension offers a COLA option, even at a reduced starting payment, run the comparison carefully. In an inflationary environment, the COLA option can make the annuity substantially more valuable than the fixed-payment version.

›What happens to the lump sum if I die shortly after retiring?

If you choose the lump sum and roll it to an IRA, the full remaining balance passes to your named beneficiaries. Your heirs can continue to grow or draw from the account. With a single-life annuity, payments stop at your death — there is no residual value for your estate. This makes the lump sum more attractive from a pure estate-planning perspective, especially for retirees in poor health or those with dependents who would benefit from the inheritance. The joint-and-survivor option is a middle ground, preserving income for a surviving spouse.

›Should I take the lump sum if I plan to leave it to my children?

If wealth transfer is a priority over personal retirement income, the lump sum is generally the better vehicle. A lump sum invested in an IRA can grow substantially and pass to heirs with a stepped-up cost basis in a taxable account, or continue tax-deferred growth under inherited IRA rules. However, the SECURE Act (2019) eliminated the 'stretch IRA' for most non-spouse beneficiaries, requiring full distribution within 10 years — which can create a significant tax burden for heirs in high income years. A financial and estate attorney familiar with your situation is essential before prioritizing inheritance in this decision.

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