Generating a monthly passive income of $20,000 translates to an annual cash return of $240,000. The total capital required to achieve this milestone varies significantly based on the net dividend yield or return rate of your investment vehicles. Assuming an average portfolio dividend yield of 4%, you would need an invested capital principal of $6,000,000. If you manage to achieve a higher blended yield of 6%, the required principal drops to $4,000,000. Building a portfolio of this scale requires careful asset allocation, diversification across stable blue-chip dividend growth stocks or fixed-income assets, and a well-defined risk management strategy.