Flexible Retirement Planner review
A free retirement planner with detailed inputs, withdrawal controls, and 10,000 modeled life cycles.
Reviewed by iTechGuides Editors · Editorial team · Updated Oct 2026
Flexible Retirement Planner models savings accumulation and retirement spending through Monte Carlo simulations, making it suited to individuals and educators who want to examine how changing financial assumptions may affect retirement outcomes. Users can enter ages, savings, portfolio balances, income, expenses, inflation, investment returns, and tax rates. The planner supports year-by-year cash flows, Social Security and other retirement income, and both flexible and dynamic spending policies. Its detailed controls are a better fit for people comfortable working with financial assumptions than for someone looking for a minimal retirement estimate.
The planning depth is its main distinction. It models 10,000 life cycles and supports taxable, tax-deferred, and tax-free portfolios, withdrawal-order configuration, early-withdrawal penalties, Roth conversions, and required minimum distributions. What-if scenarios and sensitivity analysis help users compare assumptions and see how changes may affect projected spending and portfolio outcomes. The range of inputs gives users control over tax and withdrawal choices, though it also means the planner asks for more than a few headline figures.
The software is free for personal, non-commercial use and educational use; commercial use is not permitted or supported. It is available as an online planner and downloadable standalone versions for Windows and Mac/Linux. No fixed paid plan is described, and voluntary contributions are accepted. Flexible Retirement Planner is a strong fit for people who want detailed, assumption-driven modeling without a subscription. It is less suitable for commercial advisers or users who expect synchronized financial accounts or integrated data flows; those users should consider a planner built around those needs.
Flexible Retirement Planner pros and cons
- Where it wins
- Models 10,000 life cycles for retirement simulations
- Includes Roth conversions, RMDs, and withdrawal-order controls
- Runs on web, Windows, macOS, and Linux
- Where it doesn't
- Limited to personal, non-commercial or educational use
- No verified integrations or account synchronization
- Requires detailed year-by-year financial inputs
Flexible Retirement Planner fact sheet, pricing and score →
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