The safest long-term retirement portfolio might actually be 20% Bitcoin.
April 14, 2026
Original Paper
Optimal Buy-and-Hold Asset Allocation: A Multi-Horizon Drawdown-Constrained Approach
SSRN · 6279178
The Takeaway
A mix of 40% growth, 40% gold, and 20% Bitcoin was found to maximize risk-adjusted returns while minimizing the risk of total wipeout. This directly challenges the traditional 60/40 stock-bond wisdom by suggesting that digital and physical gold are now more essential for stability than bonds.
From the abstract
We investigate optimal buy-and-hold portfolio allocation using drawdown-constrained optimization across multiple investment horizons (5, 10, 20, and 30 years). Using historical ETF data from 1996-2026, we discover a remarkably consistent "40/40/20" framework-40% growth assets, 40% gold, and 20% Bitcoin-that maximizes risk-adjusted returns across all time horizons. We find that the optimal maximum drawdown constraint converges to approximately-36% to-38% regardless of horizon length, suggesting a