Pension Lump Sum vs Monthly Calculator

Q: What is the difference between a lump sum and an annuity pension?

An annuity pension pays a fixed monthly amount for life. A lump sum is a one-time payment representing the present value of future pension payments. The annuity provides guaranteed lifetime income, while the lump sum gives you control to invest but carries the risk of outliving your money.

Q: How is a pension lump sum calculated?

Employers use IRS 417(e) segment rates and mortality tables. The lump sum is the present value of future monthly payments discounted at the 417(e) rates. When interest rates rise, lump sums shrink. When rates fall, lump sums grow.

Q: What about taxes on a pension lump sum?

A lump sum taken as cash is fully taxable as ordinary income, plus a 10% penalty if under 59½. Most people roll it into an IRA to defer taxes. A direct rollover avoids mandatory 20% withholding. Monthly pension payments are taxed as ordinary income but spread over many years.

Q: Is my pension guaranteed? What is the PBGC?

Private-sector pensions are insured by the PBGC up to approximately $6,750/month at age 65 in 2026. If your pension exceeds this limit, the excess is not guaranteed. Government pensions are backed by the government, not PBGC.

Q: Should I take the lump sum if I'm in poor health?

Generally yes. Pensions assume average life expectancy. With shorter life expectancy, you collect fewer payments, making the lump sum more valuable. The lump sum can also pass to heirs. However, consider your spouse's needs if they depend on your pension income.

Lump sum or monthly pension — which is right for you? Find your break-even age, model investment scenarios, and compare survivor benefits for your spouse. All defaults pre-filled with typical values.

Compare total value of monthly pension payments vs a one-time lump sum

Monthly pension

Your monthly pension benefit at retirement

Lump sum offer

One-time lump sum your employer is offering

Retirement age

Life expectancy

Male avg: 78, Female avg: 83. Healthy individuals often reach 85-90.

Assumed investment return

Expected annual return if you invest the lump sum

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How to Use This Calculator

Lump Sum vs Monthly tab

The default tab. Enter your monthly pension, lump sum offer, and retirement age. The calculator finds the break-even age — the point where cumulative pension payments exceed the lump sum grown at your assumed investment return. Expand "More options" to adjust life expectancy and return rate.

Investment Scenario tab

Model what happens if you take the lump sum and invest it. Set your withdrawal rate (4% is a common guideline) and see how long the money lasts month by month. The calculator compares your investment income to the guaranteed pension and shows remaining balances at key ages. Toggle inflation adjustment to see real purchasing power.

Survivor Benefits tab

Compare pension survivor options (50%, 75%, or 100%) against leaving the lump sum to your spouse. See what your spouse receives at different ages if you die early vs. late. The calculator shows the pension reduction you pay for each survivor option and the total value to your household.

Share your result

Every input is encoded in the URL. Click Share to send your exact scenario to a spouse, financial advisor, or HR representative.

The Formula

The core decision depends on comparing the present value of lifetime pension payments vs. the lump sum invested:

Break-Even Age = find year Y where:
Cumulative Pension (Monthly × 12 × Y) ≥ Lump Sum × (1 + r)^Y

Lump Sum Growth with Drawdown:
FV = PV × (1 + r)ⁿ − PMT × [((1+r)ⁿ − 1) / r]

Monthly Depletion (annuity formula):
Months until $0 = ln(PMT / (PMT − PV × r_m)) / ln(1 + r_m)
where r_m = annual return / 12

Survivor Value = Reduced Pension × 12 × Retiree Years + Survivor% × Reduced Pension × 12 × Spouse Survival Years

The break-even analysis compares cumulative pension payments against a lump sum compounding at your assumed rate. The investment scenario uses month-by-month simulation with optional inflation-adjusted withdrawals. Survivor analysis compares the total household value under each option at different death ages.

Example

Robert — 62, retiring from Ford Motor Co. in Detroit, MI

Robert is offered a $2,800/mo pension or a $510,000 lump sum. His wife Linda is 59. Robert is in good health and expects to live to 85. He assumes a 6% investment return.

Lump Sum vs Monthly tab

Monthly pension$2,800

Lump sum offered$510,000

Break-even age79

Pension total at 85$772,800

Lump sum grown at 85$1,152,500

At 6% return with no withdrawals, the lump sum grows faster. But Robert needs income — once he starts withdrawing, the break-even shifts.

Investment Scenario tab

Withdrawal rate4% ($1,700/mo)

Lump sum lasts toAge 91

Pension pays$2,800/mo for life

Income gap$1,100/mo less from lump sum

At 4% withdrawal, the lump sum provides only $1,700/mo vs the $2,800/mo pension. Robert would need a 5.6% withdrawal rate to match the pension — but that risks running out earlier.

Survivor Benefits tab

100% survivor pension$2,520/mo (reduced)

If Robert dies at 75Linda gets $2,520/mo for life

Lump sum at Robert's death (75)$285,000 remaining

Linda's lifetime pension value$393,120 (13 yrs)

With a 100% survivor pension, if Robert dies at 75, Linda receives $2,520/mo for life. The lump sum alternative would leave $285,000 — which at 4% withdrawal only provides $950/mo. The survivor pension is clearly better for Linda's security.

FAQ

What is the difference between a lump sum and an annuity pension? ▼

An annuity pension pays you a fixed monthly amount for life. A lump sum is a one-time payment that represents the present value of your future pension payments. With a lump sum, you take control of the money and invest it yourself. The annuity provides guaranteed lifetime income but ends at death (unless you choose a survivor option). The lump sum can be passed to heirs but carries investment risk and the risk of outliving your money.

How is a pension lump sum calculated? ▼

Employers use IRS 417(e) segment rates and mortality tables to calculate lump sums. The lump sum is the present value of your future monthly payments, discounted at the 417(e) rates. When interest rates rise, lump sums shrink (future payments are worth less today). When rates fall, lump sums grow. In 2026, segment rates directly affect your offer. This is why lump sum offers can vary significantly year to year.

What about taxes on a pension lump sum? ▼

If you take a lump sum as cash, it's fully taxable as ordinary income in the year received, plus a 10% early withdrawal penalty if you're under 59½. Most people roll the lump sum into an IRA or 401(k) to defer taxes. A direct rollover avoids mandatory 20% withholding. Monthly pension payments are also taxable as ordinary income but spread over many years, keeping you in lower tax brackets. Consider a Roth conversion strategy if you roll over to an IRA.

Is my pension guaranteed? What is the PBGC? ▼

Private-sector defined benefit pensions are insured by the Pension Benefit Guaranty Corporation (PBGC). If your employer's pension plan fails, PBGC pays benefits up to a maximum — approximately $6,750/month at age 65 in 2026. If your pension exceeds this limit, the excess is not guaranteed. Government pensions (federal, state, military) are not covered by PBGC but are backed by the government. If your employer is in financial trouble, taking the lump sum eliminates PBGC risk.

Should I take the lump sum if I'm in poor health? ▼

Generally, yes. Pensions are calculated assuming average life expectancy. If you have a shorter life expectancy, you'll collect fewer monthly payments, making the lump sum relatively more valuable. The lump sum can also be passed to heirs, while most pensions end at death (or pay a reduced survivor benefit). However, consider your spouse's needs — if they depend on your pension income and could outlive you significantly, the survivor pension may still be better.

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