Pension Calculator
Calculate your defined benefit pension monthly payment including COLA projections and lump sum value, or estimate income from a defined contribution account. The comparison mode shows exactly whether your DB pension or DC balance provides more retirement income.
Lump sum payout or monthly pension income?
Single-life or joint-and-survivor pension payout?
Should you work longer for a better pension?
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How It Works
The defined benefit formula multiplies final average salary by the benefit multiplier percentage and years of service. The result is the annual pension amount, which is paid monthly for the retiree's lifetime (or joint lifetime for survivor benefits).
Annual Pension = Salary × Multiplier% × Years$75,000 × 2% × 30yr = $45,000/yr = $3,750/moA COLA increases the pension payment by a fixed percentage each year. Even a modest 2% COLA significantly increases lifetime benefits over 20 to 30 years of retirement.
Year N payment = Base payment × (1 + COLA%)^N$3,750/mo with 2% COLA: Year 10 = $4,572; Year 20 = $5,570Some pensions offer a lump sum in lieu of monthly payments. The factor (typically 10× to 16× annual pension) determines the lump sum amount. Compare this to the present value of all expected monthly payments to decide which is better.
Lump Sum = Annual Pension × Lump Sum Factor$45,000/yr × 12× factor = $540,000 lump sumA defined contribution balance is converted to monthly income using the annuity formula. The monthly income depends on balance size, investment return during retirement, and the number of years you need the income to last.
PMT = Balance × r/12 / [1 - (1+r/12)^(-months)]$500K at 6% for 25yr = $3,222/moThe break-even age is where the cumulative total of monthly payments equals the lump sum. Living past break-even, monthly payments win. The calculation: Lump Sum / Monthly Payment gives the months to break even.
Break-even months = Lump Sum / Monthly Benefit$540K lump sum / $3,750/mo = 144 months (12 years) = break-even at 77The comparison shows the monthly income from both plans side by side. DB provides guaranteed lifetime income regardless of market performance. DC provides higher income if investments perform well but the account can be depleted.
Compare: DB Monthly vs DC monthly incomeDB $3,750/mo guaranteed vs DC $3,222/mo (depends on returns)Quick Reference
Common examples — verify instantly above.
$75K salary, 2%, 30yr
Monthly DB pension
$3,750/mo
$75K salary, 2%, 20yr
Monthly DB pension
$2,500/mo
$3,750/mo with 2% COLA
Payment in year 20
$5,570/mo
Lump sum 12×
$45K annual pension
$540,000
Break-even
$540K / $3,750/mo
144 months (12 years)
DC: $600K at 6%, 25yr
Monthly income
$3,866/mo
DC: $400K at 6%, 25yr
Monthly income
$2,577/mo
3% multiplier
$75K salary, 25yr
$4,688/mo pension
Tips & Shortcuts
Know your vesting schedule before leaving an employer. Many DB plans require 5 to 10 years of service to receive any pension. Leaving one month before vesting is an extremely costly mistake.
For the lump sum decision, get a PV calculation at a realistic discount rate (6% to 7%). If the lump sum exceeds the PV of expected monthly payments, the lump sum is favorable — usually when you are in poor health.
Consider survivor benefits when choosing between single-life and joint-life pension options. Single-life pays more monthly but leaves nothing for a spouse at death. Joint-life pays less but provides survivor income.
A 2% COLA doubles your pension payment every 36 years at the Rule of 72. A pension without COLA, however, loses half its purchasing power in 24 years at 3% inflation.
If you have both a DB pension and DC plan, treat the guaranteed DB income as the foundation and invest the DC plan more aggressively since you already have downside protection.
Request a pension estimate from your plan administrator every year showing the monthly benefit at your planned retirement age. Verify the calculation against the formula to catch any errors.
Common Mistakes to Avoid
Leaving an employer just before the pension vesting date
DB pension vesting requires years of service — often 5 to 10 years. Always check the vesting schedule and the cliff date before resigning. Leaving one year early can forfeit the entire pension.
Not comparing the lump sum against expected monthly payments
The lump sum seems large but monthly payments over a long retirement often total much more. Calculate the present value of all expected payments at a reasonable discount rate and compare.
Choosing single-life pension without discussing with your spouse
Single-life pensions pay more but provide nothing to a surviving spouse at death. Joint-and-survivor options provide income security for both spouses at a small reduction in monthly benefit.
Assuming a fixed pension maintains purchasing power over time
Without COLA, inflation erodes purchasing power dramatically. A $3,000 pension in year 1 buys what $1,830 buys in year 20 at 2.5% inflation. Plan other income sources to offset this erosion.
Counting employer pension contributions as personal savings
DB pension contributions belong to the pension fund, not the employee's personal account. Unlike a 401k, you cannot invest or withdraw pension contributions — they exist solely to fund the promised benefit.
Not naming proper beneficiaries for survivor benefits
Survivor benefit elections must typically be made at retirement and cannot be changed afterward. Failing to elect proper joint-and-survivor benefits can leave a spouse without income after the pensioner's death.
Frequently Asked Questions
A defined benefit (DB) pension guarantees a specific monthly payment in retirement, typically calculated as salary × years of service × benefit multiplier. For example, $80,000 salary × 25 years × 2% = $40,000/year ($3,333/month). The employer bears the investment risk, not the employee.
A defined benefit plan guarantees a specific monthly income based on salary and years of service. A defined contribution plan (401k, 403b) provides a balance that you invest and manage — the income in retirement depends on investment performance. DB plans have shifted to DC plans in most private companies since the 1980s.
The formula is: Annual Pension = Final Average Salary × Benefit Multiplier % × Years of Service. A 2% multiplier is common in public plans. A teacher with $70,000 salary and 30 years of service at 2% earns $42,000/year or $3,500/month for life.
Compare the lump sum to the present value of monthly payments. If offered a lump sum of 12× the annual pension and you invest it at 6% for 25 years, you recover the monthly payments. If you live longer, monthly payments win. Health and life expectancy are critical factors.
A Cost-of-Living Adjustment (COLA) increases pension payments annually to offset inflation. Public pensions often have a 2% to 3% fixed COLA. Private pensions rarely include COLA, meaning fixed payments lose purchasing power over time. A $3,000/month pension without COLA buys far less in 20 years.
DB pensions beat DC plans when: you stay with the employer long enough to vest and accrue significant benefits, investment returns are lower than expected in the DC plan, or you live significantly longer than average. DC plans win when you change employers frequently, earn high investment returns, or die young.
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