Facing a pension election — take a single large payout now, or a monthly check for life — is one of the biggest money decisions of your career. This calculator compares the two paths side by side: it shows how many years the lump sum would take to "pay back" at the annuity amount, how much you could safely pull from an invested lump sum each month, how long that money would last, and what your survivor benefit is worth.
Run the numbers on your actual offer letter. The single most useful line in the result card is the breakeven: the age at which the lifetime annuity has already handed you back every dollar of the lump sum. Live longer than that and the annuity wins on pure dollars; die younger and the lump sum wins for your estate.
How to Use
- Enter the Pension Lump Sum Offered — the cash figure your plan administrator quotes if you take the payout instead of the monthly check.
- Enter the Monthly Annuity (Life Income) — the single-life monthly payment you would receive for the rest of your life starting at your retirement date.
- Set the Expected Investment Return. A long-run 6%–8% stock-and-bond mix is the standard planning assumption, but stress-test it at 4% (conservative) and 10% (optimistic) so you can see how much the verdict swings with markets.
- Choose Years You Plan to Draw. A common planning range is 62 to 92, or about 30 years; adjust up if longevity runs in your family and down if your health suggests a shorter horizon.
- Add your Survivor Monthly Benefit if you are married or have a partner — the reduced monthly payment that continues to them after you pass. Leave it at zero if you are single.
The result card then breaks the decision into five questions: how long the annuity takes to pay back its own lump sum, the monthly income an invested lump sum could safely produce over your horizon, the gap versus the annuity check, how many years the lump sum actually lasts if you draw the annuity amount, and the annual value of the survivor benefit.
The Math Behind the Decision
The simplest comparison is the breakeven. If the plan offers a $600,000 lump sum versus $3,000 per month, the annuity hands you the lump-sum equivalent after $600,000 / ($3,000 × 12) = 16.7 years of payments. Every month past that date is money the annuity pays that the lump sum could not — because, remember, the annuity keeps paying no matter how long you live, while a pool of cash can run dry.
The lump-sum camp fights back with investment growth. Invested at 7% per year, a $500,000 lump sum can sustain about $3,327 per month for 30 years using the standard annuity-payout formula — more than a $3,000 life check — while leaving a projected balance near $398,000 at the end. That formula, W = L × m(1+m)ⁿ / ((1+m)ⁿ − 1), is the same one used by every financial calculator and bank amortization table.
The catch is longevity and risk. The annuity is an insurance policy against outliving your money: it is guaranteed for life by the plan, adjusted or not, regardless of stock-market crashes. The lump sum depends on your skill, discipline, and luck — a bad sequence of returns early in retirement can permanently shrink a portfolio. This calculator does not decide for you; it quantifies the trade-off so you can weight the guarantees against the upside.
Examples
Example 1 — A standard 7% assumption. A 62-year-old is offered a $500,000 lump sum or $3,000 per month for life. Assuming a 7% annual return over 30 years, the calculator shows a simple breakeven of 13.9 years (the annuity has repaid the lump sum by age 75.9), a sustainable lump-sum draw of $3,327 per month, and the lump sum lasting roughly 51 years if you pull $3,000 monthly — with about $398,000 still left at year 30. On paper the lump sum looks stronger; the annuity's edge is the lifetime guarantee and the hands-off simplicity.
Example 2 — A conservative 4% stress test. Slide the expected return down to 4% and the same $500,000 lump sum now supports only about $2,390 per month over 30 years — well below the $3,000 annuity. The breakeven barely moves at 13.9 years, but the monthly gap flips negative: at low returns the guaranteed annuity check beats an invested pool, which is exactly why market timing assumptions dominate this decision.
Example 3 — A seven-figure payout. A senior executive is offered a $1,500,000 lump sum versus $6,000 per month for life over a 25-year horizon at 6%. The simple payback is 20.8 years, the lump sum can sustain about $9,665 per month over that horizon, and — because the $6,000 draw is far below the account's earnings — the balance never depletes and is projected to exceed $2,500,000 by year 25. For very large pools the annuity's insurance value is thin relative to the assets; for small pools the guarantee is everything.
Example 4 — Survivor protection. With a $400,000 lump sum, a $2,500 monthly life benefit, a 5% return over 20 years, and a $1,200 survivor benefit, the survivor rider is worth $14,400 per year. If the retiree dies early, that rider keeps income flowing to a spouse where a spent-down lump sum might not — a consideration the monthly-draw math alone ignores.
FAQ
Should I take the pension lump sum or the monthly annuity?
There is no universal answer. Take the lump sum if you are younger, comfortable managing investments, in good health, and want flexibility or a potential inheritance. Take the annuity if you want a guaranteed lifetime check, worry about outliving your savings, or are less confident investing. This calculator quantifies the breakeven age and sustainable monthly draw so the choice rests on your own numbers rather than sales pressure.
What is the breakeven age for a pension lump sum?
The simple breakeven is the lump sum divided by twelve times the monthly benefit. A $500,000 lump sum versus $3,000 per month pays itself back in about 13.9 years. Add the lump sum's start date to that: if payments begin at 62, breakeven is roughly age 75.9. Survive past it and the annuity has paid more; die before it and the remaining lump sum would have gone to your estate.
Can a lump sum really grow faster than the annuity?
It can, but not guaranteed. Invested at 7%, a $500,000 lump sum might sustain $3,300+ per month for 30 years; at 4% that drops below $2,400. The annuity offers a fixed check immune to market losses — the trade-off is giving up upside and, if you die young, the chance to leave money to heirs.
What happens to my pension if I choose the lump sum?
The plan usually closes your monthly-pension entitlement; you roll the lump sum into an IRA or another qualified plan, or take a taxable distribution. From then on your retirement income comes from withdrawals you control, and the lifetime guarantee disappears. Rollover details, withholding, and tax treatment should be confirmed with a plan administrator and a tax professional before you sign.
Is the survivor benefit worth the reduction in my monthly check?
Often yes for married couples, especially when one spouse has little other income. The rider costs you a lower monthly check while you live, but keeps a stream (commonly 50%–75% of your payment) flowing after your death. Enter your survivor monthly benefit to see its annual value; compare it against what an invested lump sum might leave behind instead.
What rate of return should I assume for the lump sum?
Use a realistic long-run mix. A moderate 6%–8% portfolio of stocks and bonds is the planning baseline, but always run a 4% bear case and a 10% bull case. If the annuity wins at 4% but loses at 8%, the decision is really a bet on markets and on your own temperament — not a mathematical slam dunk.
Disclaimer
This pension lump sum calculator is provided for informational purposes only and does not constitute financial, investment, tax, or legal advice. Figures are estimates based on the inputs you enter and standard annuity math; they ignore inflation, taxes, survivor-option reductions, cost-of-living adjustments, and early-withdrawal penalties. Pension elections are usually irreversible. Before choosing between a lump sum and a lifetime annuity, review your plan documents and consult a fiduciary financial advisor and a qualified tax professional.