70/30 Asset Allocation: How Retirement Account Millionaires Build Wealth

Retirement account millionaires increasingly follow a 70/30 stock-to-bond allocation to build wealth over time, according to David Bach and Fidelity data. As of February 12, 2026, there are about 654,000 401(k) millionaires in the U.S., with roughly 14% of gross income dedicated to retirement savings. The strategy emphasizes index funds for growth (e.g., VTI, QQQ) and bonds for stability, leveraging the power of compounding rather than trading or high-risk assets. Key to success is automation—setting up "pay yourself first" deductions to channel 12.5%–14% of income into an automated 70/30 portfolio. Daily savings of about $27.40 could grow to over $4.4 million over 40 years at a 10% annual return. Gen Z investors show a contrasting profile, favoring crypto (44%–55%), individual stocks (32%–41%), and alternatives (31%) versus older investors’ smaller allocations in those categories. While the 70/30 approach contrasts with younger, riskier strategies, it remains a tried and effective wealth-building method for steady compounding over decades.