When could Bitcoin let you retire?

The tool doesn't answer that — you do. What it does is make the math honest.

The core problem with most retirement planning is that it uses historical equity returns (7–10% real CAGR) as a baseline, without acknowledging that those returns come from a specific 80-year period of American economic dominance that may not repeat. Bitcoin's historical returns are much higher and much more volatile. Both sets of numbers are backward-looking.

What the calculator actually models:

The future value of Bitcoin holdings under a user-specified annual appreciation rate, compared to a traditional portfolio. It also models withdrawal sustainability using a sequence-of-returns framework — which matters enormously for Bitcoin, because a 70%+ drawdown in year one of retirement is categorically different from the same drawdown in year fifteen.

The arguments for including Bitcoin in retirement planning:

• Uncorrelated (or weakly correlated) to equities, especially in monetary stress scenarios
• Fixed supply schedule creates a different return driver than earnings-based assets
• A small allocation (2–10%) can meaningfully shift the distribution of outcomes without betting the retirement on a single asset

The arguments against treating it as a primary retirement asset:

• Sequence-of-returns risk is severe for a volatile asset — the math on bad early sequences is genuinely ugly
• Tax treatment of large Bitcoin positions at retirement age is non-trivial and jurisdiction-dependent
• Regulatory risk remains real in ways that equity positions don't face

The responsible use of this tool is to model a range of appreciation scenarios including flat and negative, and to treat the Bitcoin allocation as a component of a diversified plan rather than the plan itself.

Use a range, not a single number, and let the spread tell you how brittle the plan is.

Three benchmarks worth running:

• Power-law trend (~ 25–30% CAGR through 2035): what the long-term log-log fit implies, decelerating each year
• Conservative (10% real): roughly long-run equity returns, the floor most credit committees and pension actuaries accept
• Stress (0% or −2% real): what the plan looks like if Bitcoin tracks inflation or underperforms it for the entire withdrawal phase

A retirement plan that only works at 20%+ CAGR isn't a plan, it's a wish. A plan that survives at 5% real is robust.

Sequence-of-returns risk is the math fact that two retirees with the same average return — but in different order — can end up with wildly different outcomes if they're withdrawing as they go.

If a 70% drawdown hits in year one of retirement, a 4% withdrawal that year is now an 11% withdrawal of the remaining balance. The portfolio may never recover even if the asset eventually does, because the units sold to fund withdrawal don't participate in the rebound.

Three defences that materially help:

• A cash buffer covering 2–3 years of spending so you never sell into a deep drawdown
• A glide path that reduces Bitcoin allocation as retirement approaches, accepting lower expected return for narrower outcome distribution
• A variable withdrawal rule (e.g. spend 4% of current balance, not 4% of original) that automatically cuts spending after a bad year

There is no universal number, but a few honest defaults:

• 5–10% of investable assets is the range most balanced-portfolio research supports as additive without dominating outcomes
• Above 25% effectively makes the retirement plan a Bitcoin price call — defensible if that's a deliberate choice, dangerous if it's drift
• Below 1% is too small to move the needle either way; a rounding error in a real plan

Whatever number you choose, decide it in advance and rebalance to it. The dangerous allocation is the one that grew to 60% because it appreciated and you never trimmed.