A joint survivor annuity calculator shows how electing lifetime payments for two lives changes your monthly pension check. A joint and survivor annuity pays the participant for life, then continues lifetime payments to the surviving spouse at 50% to 100% of the participant's amount, as the IRS defines qualified joint and survivor annuities in its IRS explanation of qualified joint and survivor annuities. Enter ages, a starting benefit, a survivor percentage, and interest and mortality assumptions. The result shows a lower payment while both spouses live in exchange for continued income for the survivor.
Table of Contents
- What the calculator compares
- What inputs to enter
- Which assumptions change the answer
- How to read your results
- Taxes and choices you cannot undo
What the calculator compares
A single-life annuity pays more each month but stops at the participant's death. A joint-survivor option pays less while both spouses live to fund payments after the first death. The joint option must be at least the actuarial equivalent of the single-life annuity.
That trade is the core decision for couples who need two lifetimes of income. Married participants in covered plans receive the joint-survivor form by default. The IRS requires written, witnessed spousal consent to waive it and choose another form.
What inputs to enter
Use your plan statement or benefit estimate for the starting amount. Use current ages, not retirement ages alone, because joint life expectancy drives the reduction.
The Labor Department identifies these same inputs for lifetime-income calculations. Match the plan's survivor choices exactly before you compare results.
- Participant age and spouse or beneficiary age at the start date
- Starting single-life benefit or current account balance
- Survivor percentage, commonly 50%, 75%, or 100%
- Interest rate and mortality assumption used for conversion
Which assumptions change the answer
Interest rates and mortality tables do much of the work. Higher interest rates support higher monthly payments, while longer joint life expectancy lowers them. Federal illustrations use a common baseline: payments beginning at age 67, a spouse the same age, a 10-year Treasury rate, and gender-neutral mortality under IRC section 417(e)(3).
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Your plan may use its own rate, ages, and table. Check whether the calculator uses your plan's assumptions or a generic illustration. A generic result helps you compare options, but only plan-specific numbers support an election.
How to read your results
Look first at the paired monthly amounts, not the total alone. The Labor Department's example makes the tradeoff concrete: the same balance producing 645 dollars per month as a single-life annuity at 67 produces only 533 dollars per month as a 100% joint-and-survivor annuity, according to the Labor Department fact sheet on lifetime income illustrations. Higher survivor percentages mean lower payments while both spouses live.
A 100% option protects the survivor most and reduces the joint payment most. Federal workers see the same pattern in fixed reductions. OPM reduces FERS annuities by 10% for a full 50% survivor benefit or 5% for a 25% partial benefit. Compare each survivor level side by side, then test whether the lower joint payment still covers fixed household costs.
Taxes and choices you cannot undo
For federal taxes, joint-annuity recipients using the Simplified Method add both annuitants' ages at the start date. That combined age sets the expected number of payments and the tax-free portion of each check.
The election is generally permanent. PBGC warns that the joint-survivor reduction stays even if the beneficiary dies first, and the beneficiary cannot be changed after the first payment, as explained in its PBGC participant booklet on benefit choices. Get the plan's election deadline, survivor percentages, and spousal-consent rules in writing before payments begin.
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