Why Even the Best Retirement Calculator is Wrong

What this episode covers

Roger Whitney explores why retirement planning software—especially Monte Carlo simulations—can give a false sense of confidence if misunderstood. He explains what these tools actually measure, the hidden assumptions behind them, and why retirement is a complex problem that requires judgment, flexibility, and resilience—not just a high “success rate.” Roger shares how to properly interpret results, avoid common traps, and use software as a guide rather than a decision-maker so you can build a retirement plan that supports a great life.OUTLINE OF THIS EPISODE OF THE RETIREMENT ANSWER MAN(00:00) This show is dedicated to helping you not just survive retirement, but have the confidence to lean in and rock it.(00:30) Roger introduces the episode topic—why your retirement calculator’s success rate can be misleading.PRACTICAL PLANNING SEGMENT(02:50) Roger explains his perspective as a long-time practitioner and outlines his experience using Monte Carlo-based retirement tools.(05:05) Complicated vs. complex problems: why retirement can’t be “solved” like a math equation and must instead be managed over time.(09:30) Concerns about overreliance on software—from advisors scaling businesses to individuals misinterpreting results.(11:30) What retirement software actually measures.(13:25) What software does NOT measure.(14:18) Best uses of planning software.(17:40) What software should NOT be used for.(19:40) Key dangers of using retirement software.(23:00) Feasibility vs. resilience: why a plan that “works” on paper may still be fragile in real life.(24:20) The real risk:Overspending early and jeopardizing later yearsUnderspending and missing out on life(26:20) The massive number of assumptions behind every plan—and how small changes can dramatically alter outcomes over time.(38:20) How to interpret results properly.(40:55) Looking beyond the number: evaluating the distribution of outcomes and plan sensitivity.(44:43) Understanding failures:Timing (early vs. late failures)Severity (minor shortfall vs. major gap)(48:27) Best practices:Hold success rates lightlyKeep plans simpleRegularly review assumptionsAvoid over-planning and constant tweakingDefine what success actually means for your lifeSMART SPRINT(56:04) Schedule time to review the assumptions in your retirement planning software—focus on understanding the inputs rather than optimizing the output.CLOSING THOUGHTS(56:50) Roger shares an update on the merger of his firm with Tanya Nichols’ firm and the creation of a new company, Retire Agile.REFERENCESlivewithroger.com — Register for Noodle Live on March 28!Submit a Question for RogerSign up for The Noodle

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How long is this episode of Retirement Answer Man?

This episode is 59 minutes long.

When was this Retirement Answer Man episode published?

This episode was published on March 25, 2026.

What is this episode about?

Roger Whitney explores why retirement planning software—especially Monte Carlo simulations—can give a false sense of confidence if misunderstood. He explains what these tools actually measure, the hidden assumptions behind them, and why retirement...

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