Lazy Portfolios in One Click: Try a Three-Fund, Permanent, or Golden Butterfly Without Touching Your Holdings
2026-05-23
Apply a curated lazy-portfolio recipe such as the Three-Fund, Ferri Core Four, Permanent, All Seasons, or Golden Butterfly to a duplicate of your simulation in one click. Edit it afterward like any other saved sim.
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Bring Your Own Data: Upload Custom Market Series
2026-05-19
Upload your own historical returns (CSV or .xlsx) and run FIREproof against the market data you trust.
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FAFSA Optimizer: Plan College Aid Around Your Withdrawals
2026-04-27
Model federal financial aid year by year, see exactly which withdrawals are pushing your SAI up, and let the simulator route around your kid's FAFSA base years for you.
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ACA Healthcare Subsidies: Model Your Real Insurance Costs
2026-03-26
New feature: automatically calculate ACA marketplace premiums and Premium Tax Credit subsidies year by year in your retirement simulation.
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Tax Strategy: Roth Conversions + Tax-Efficient Withdrawals
2026-03-11
Two new tools to help you keep more of your money out of the IRS's hands.
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Monte Carlo Assets - Data for any Asset Class!
2025-08-13
FIREproof, now with Bitcoin... sort of.
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Required Minimum Distributions + Musings of a product launch
2025-07-21
FIREproof... now with involuntary withdrawals!
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I feel the need, the need for speed.
2025-07-10
Attempts at improved user experience and performance.
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Keep the feedback coming!
2025-07-03
Thank you to everyone who’s visited since the Beta launch. I’ve been squashing bugs and tracking down the issue that blocked new users from clicking “Proof” and seeing the glorious charts -and your reports through the Contact Us menu are invaluable. Keep ’em coming!
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Welcome to the Beta release of FIREproof!
2025-07-01
I've been part of the FIRE community for nearly 20 years. Early on I launched cFIREsim.com to help folks run the numbers…
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