Run retirement scenarios: fiat drawdown, Bitcoin-only spending ("cage"), and borrow/loan strategies.
Inputs
Change anything—results update instantly.
Notes: These are planning models, not advice. Borrowing increases liquidation risk.
Results
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Portfolio @ retirement
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BTC × price
Sustainable spend
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Depends on method
Runway / risk
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Horizon vs depletion
Quick sanity checks: 4% rule assumes a diversified portfolio and historical conditions. Borrow models are extremely sensitive to drawdowns and interest rates.
Year-by-year (first 15 years)
Shows spending, BTC sold/borrowed, and remaining BTC.