Pension Buyback Break-Even Calculator
Use your plan’s cost and added-benefit quote to compare the purchase with keeping the money invested. The results show nominal and discounted break-even ages through a scenario horizon you choose.
Simple break-even age67.83 years
- Discounted break-even age
- 74.33 years
- First-year added pension
- $6,000.00
- Total nominal pension received
- $243,408.48
- Present value of added pension
- $91,112.13
- Net present value
- $41,112.13
- Present-value benefit-cost ratio
- 1.82
- Implied annual return
- 6.79%
Assumes the quoted cost is paid now, added pension payments arrive at month end, and each COLA starts after every 12 payments.
It models benefits only through the selected evaluation age and excludes taxes, survivor benefits, financing, and plan-specific retirement changes.
How to use this calculator
- Enter the lump-sum buyback cost and the added monthly pension from your official plan quote.
- Enter your age when the cost would be paid and the age when the added pension would begin.
- Choose an evaluation age that represents the scenario you want to examine, not a prediction of your lifespan.
- Enter the COLA that applies to the added benefit and the return you would otherwise expect from the money.
- Review present value, both break-even ages, and the implied return alongside plan rules that this estimate cannot model.
How the pension buyback comparison is calculated
A pension buyback is an immediate cost in exchange for a future stream of added pension payments. This calculator does not estimate the cost or determine whether you are eligible. It starts with the official quote and asks whether the added income recovers that cost under the timing, COLA, and opportunity-cost assumptions you enter.
Let C be the buyback cost, B the initial added monthly pension, D the whole months from the current age to pension start, and N the whole benefit months through the evaluation age. The payment in month k is F(k) = B × (1 + g)^floor((k - 1) ÷ 12), where g is the annual COLA. That keeps the payment level for 12 months, then increases it once a year.
The simple break-even age is the first age when the running total of those payments reaches C. It ignores that a dollar received years from now is worth less than a dollar held today. For the discounted results, the monthly effective discount rate is v = (1 + r)^(1 ÷ 12) - 1, where r is your annual discount rate. Present value is PV = sum(F(k) ÷ (1 + v)^(D + k)). Net present value is PV - C, and the benefit-cost ratio is PV ÷ C.
The implied annual return reverses that comparison. The calculator solves for the annual rate that makes the present value of the modeled payments equal the quoted cost. It is an annual effective rate, not a plan crediting rate or a guaranteed investment return.
What moves the result most
The time until payments begin and the evaluation age usually matter as much as the monthly increase. A benefit beginning at 65 has fewer discounted dollars than the same benefit beginning at 60. A longer horizon can make a buyback look more valuable, but it is only a scenario assumption. A COLA can be especially important over a long retirement; when it is higher than the discount rate, later payments may have substantial present value.
What this calculator leaves out
Plan rules can change both the cost and the value of service credit. This model excludes taxes, payment plans and rollover treatment, contribution limits, survivor pensions, guarantee periods, benefit caps, health coverage, and changes to early-retirement eligibility. It also assumes the added benefit is paid monthly at month end and that the entered COLA applies fully to that benefit. Confirm whether buying service changes your retirement date or other plan benefits, because those effects can be more important than the added monthly amount alone.
Worked example
Suppose a plan quotes a $50,000 buyback that adds $500 a month starting at age 60. The member is 50 now, evaluates benefits through age 90, expects a 2% COLA, and uses a 4% annual discount rate. The first-year added pension is $500 × 12 = $6,000.
There are 120 months until payments begin and 360 modeled benefit months. The first 12 payments are $500, the next 12 are $510, and so on. The calculator sums those payments for the nominal total, then discounts each payment back to age 50. The simple and discounted break-even ages show when the respective running totals first meet the $50,000 cost; if either total does not meet the cost by age 90, it reports “Not reached.”
Common questions
How do I decide whether a pension buyback is worth it?
Begin with the official purchase cost and added-benefit quote, then compare the present value and implied return with your alternatives for the money. Also check whether the credit changes your retirement date, eligibility for an unreduced pension, survivor protection, or other benefits, because this calculator does not value those plan-specific effects.
Where do I find the added monthly pension amount?
Ask the pension administrator for a service-credit purchase quote or a retirement estimate with and without the purchase. Enter only the difference in monthly pension attributable to the purchase, rather than your full projected pension.
Why is discounted break-even later than simple break-even?
Simple break-even counts future pension dollars at face value. Discounted break-even reduces each future payment by the return the buyback money could otherwise earn, so more payments are normally needed to recover the cost in present-value terms.
What discount rate should I use for a pension buyback?
Use a rate that reflects the after-tax return and risk you associate with your realistic alternative for the money. Running a few rates can be more useful than treating one rate as certain; a higher rate makes delayed payments worth less today.
Does buying service credit let me retire earlier?
Sometimes, but only the plan can confirm it. Some plans use service credit in eligibility rules or early-retirement reductions, while others treat the purchase mainly as a benefit increase. This calculator models only the added pension income you enter.
Is the implied return guaranteed?
No. It is the rate that equates the entered cost and modeled payment stream through the selected age. The result depends on the plan continuing to pay as quoted, the COLA assumption, and the evaluation horizon; it is not an investment guarantee or recommendation.