Pension Calculator

This calculator estimates your defined-benefit pension from salary, years of service, and a benefit multiplier, and separately compares a lump sum payout against monthly annuity payments so you can see which one actually lasts longer under your own assumptions.

For personal planning only — not financial advice.

Reviewed by CalculatorDrive Finance Editorial Board · Last updated

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The short answer

$80,000 final salary, 25 years of service, and a 2% multiplier gives $40,000 a year ($3,333.33/month) — a 50% income replacement ratio. Compare that to a $500,000 lump sum offer: invested at 5% and drawn down at the same $3,000/month a competing annuity would pay, it still has $123,219.14 left after 20 years — the annuity would only need to earn 1.84% to match it.

Key takeaways

  • $80,000 salary × 25 years × 2% = $40,000/year pension, a 50% replacement of final salary.
  • With 2% COLA over a 30-year retirement, total benefits paid reach $1,622,723.17 — worth $918,368.69 in today's present value at a 4% discount rate.
  • A $500,000 lump sum invested at 5% and drawn at $3,000/month lasts the full 20 years with $123,219.14 to spare.
  • The annuity implied a 1.84% return requirement to match the lump sum here — a useful benchmark for judging whether the annuity or lump sum is the better deal.

The defined-benefit formula

Annual Pension = Final Salary × Years of Service × Multiplier

= $80,000 × 25 × 2% = $40,000/year ($3,333.33/month)

That $40,000 is only the starting figure — with a 2% annual cost-of-living adjustment, the benefit grows every year in retirement. Over a 30-year retirement, cumulative payments reach $1,622,723.17, though a dollar received in year 30 is worth much less than a dollar today: discounted back at 4%, the whole stream is worth $918,368.69 in present-value terms — a more honest number for comparing against a lump sum offer.

Lump sum vs annuity: comparing on the same terms

A $3,000/month annuity for 20 years (age 65 to 85) pays $720,000 in total — but that total ignores timing and investment growth entirely. Testing the $500,000 lump sum alternative, invested at 5% and drawn down at the same $3,000/month:

Lump sum balance after 20 years of $3,000/month withdrawals at 5% growth: $123,219.14 remaining

Implied annual return the annuity would need to match the lump sum: 1.84%

Because the lump sum still has money left after 20 years, it effectively "wins" this comparison as long as a 5% return is realistic and sustainable — but that's exactly the risk being taken on: the annuity's income is guaranteed regardless of markets, while the lump sum's outcome depends entirely on actually earning that return and not overspending. The 1.84% implied rate is the break-even bar — below it, the lump sum falls short; above it, the lump sum comes out ahead.

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Frequently Asked Questions

How is a pension benefit usually calculated?

Defined-benefit pensions often multiply years of service by a percentage of final average salary. On an $80,000 final salary with 25 years of service and a 2% multiplier, that is $80,000 × 25 × 2% = $40,000 a year ($3,333.33 a month) — a 50% income replacement ratio.

What is the difference between a pension and a 401(k)?

A pension promises a future benefit based on a formula; the employer bears investment risk. A 401(k) is an account you fund and invest; your balance depends on contributions and market returns.

Should I take a lump sum or monthly pension payments?

It depends on the numbers behind the offer. A $500,000 lump sum invested at 5% and drawn down at $3,000/month (the same as a competing annuity) over 20 years still has $123,219.14 left — the annuity would need only a 1.84% return to match, meaning the lump sum wins here if you can realistically earn more than that.

How much does a pension actually pay out over a full retirement?

On a $40,000 starting annual pension with a 2% cost-of-living adjustment over 30 years, total benefits paid reach $1,622,723.17 — but discounted back to today's dollars at a 4% rate, that stream is worth $918,368.69 in present value.

Are pension benefits guaranteed?

Private pensions may be insured by the PBGC up to limits if the plan fails, but full promised benefits are not always guaranteed. Public-sector pensions depend on government funding and laws in your state.

How do I use this pension calculator?

Enter years of service, final average salary, benefit multiplier, and optional cost-of-living adjustment, then click Calculate to estimate your monthly or annual pension benefit.

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