Pension Lump Sum vs Annuity Calculator

The break-even age is the whole negotiation

A pension buyout letter is an insurance company quoting you a price for your own longevity. The first number to compute is the naive one: divide the lump sum by the annual annuity. On the offer used throughout this page, $400,000 against $2,150 a month ($25,800 a year), the checks repay the lump sum in 15.5 years. Retire at 65 and the annuity pulls ahead at about age 81, before any investment returns enter the argument. Live longer than the break-even and the annuity was the better buy; die sooner and the lump sum (what is left of it) goes to your heirs while the annuity simply stops.

Returns move the break-even, honesty about returns moves it more

Invested, the lump sum fights back: every year it earns, the annuity needs longer to catch up. Discount the annuity at 5% over 25 years and its present value is $363,624, less than the $400,000 lump sum, which is the same statement as: the lump sum must earn about 4.1% a year for 25 years to manufacture the annuity's $25,800 a year on its own. Earn less and the annuity wins; earn more and the lump sum wins. Here is the sensitivity, because the honest output of this decision is a table, not a verdict:

Notice what the table quietly assumes: that you actually earn the return, in the order it arrives, without panic-selling in year two. The annuity's return is contractual. Comparing a guaranteed payment to an expected market return without that caveat is how buyout letters win arguments they should lose.

The two silent terms: inflation and the survivor

Most private-sector annuities are fixed in nominal dollars. At 2.5% inflation, the $2,150 check buys what $1,312 buys today by year 20. A lump sum invested in assets that reprice with inflation carries its own hedge; a fixed annuity's hedge is that you will not outlive it, which for a healthy 65-year-old couple is precisely the risk that matters, since the chance at least one spouse passes 90 is roughly a coin flip. Survivor terms are the second silent term: a single-life annuity dies with you, a joint-and-survivor option pays less monthly but keeps paying your spouse, and the lump sum is the only option that is fully inheritable on day one. Price the option you are actually being offered, not the headline one.

Finally, the guarantee question. A pension annuity from a solvent plan is backed by the PBGC within limits, and an insurer annuity by state guaranty associations within theirs. A lump sum rolled into an IRA is backed by your investment discipline. None of those is a reason by itself; together with the break-even age, they are the decision. If your break-even lands in your late seventies and your family history runs long, the annuity is usually underpriced in your favor. If it lands in your late eighties, the company has done its math too.

How the company priced your offer

Employers do not invent the lump sum. Federal rules require it to be at least the actuarial present value of the annuity, computed with IRS-prescribed mortality tables and a set of corporate bond segment rates published monthly. When segment rates rise, lump sums fall, because a higher discount rate shrinks the present value of every future check; employees who retired in low-rate years were offered visibly richer buyouts for identical pensions. Your letter's amount therefore contains a hidden interest-rate timestamp. Nothing obliges you to accept in a high-rate month, and where the plan allows a later election date, the same annuity can price differently a year later. The required-return figure this calculator produces is the bridge between the two worlds: it tells you the rate the offer implicitly assumes about your own investing.

The partial option nobody mentions

Many plans allow splitting the difference: part lump sum, part annuity. The split is often the genuinely correct answer, because the two instruments solve different problems. An annuity sized to cover the household's fixed floor (housing, insurance, food) converts longevity risk into a paycheck; a lump sum for the remainder preserves flexibility, inheritance, and the Roth conversion raw material that annuity income cannot provide. When you model a split, run each half through this calculator separately: the annuity half against your floor expenses, the lump sum half against the drawdown simulation in how long will my money last. Electing 100% of either is a stronger claim about the future than most households actually believe.

Questions to ask before the election deadline

Is the annuity quote single-life or joint, and what exactly does the survivor percentage pay? Does the plan offer a cost-of-living adjustment, and if so, is it fixed or CPI-linked? What is the plan's funded status, and how much of your benefit sits under the PBGC guarantee cap? Can the lump sum be rolled directly to an IRA (it must be, to avoid mandatory 20% withholding and a taxable event)? Does electing the annuity affect retiree health coverage tied to the pension? And what happens to each option if you die the month after electing? A buyout letter is written to be answered quickly; every one of these questions is a reason the plan is required to give you time, and the spousal consent form your spouse may have to sign is the plan's own admission that this decision is bigger than a signature.