Optimizing after-tax portfolios and asset allocation involves evaluating investment strategies across multiple periods, focusing on metrics such as asset weight, market value, cost basis, cash flows, management fees, turnover, taxes, and after-tax returns for each individual asset. This comprehensive analysis can encompass up to 100 different assets over 120 distinct periods, with intervals that can vary from daily assessments to annual evaluations. Additionally, the framework allows for the creation of sub-portfolios tailored to various tax implications and ownership scenarios. By incorporating international asset class return series, one can enhance forecasting model inputs, while Monte Carlo simulations enable the testing of constructed portfolios under various market conditions. Furthermore, the "What If" portfolios feature allows for the development and comparison of customized investment strategies tailored to specific goals. The model also accommodates international currencies and tax rates, providing a global perspective on asset allocation. To account for economic cycles and shifts, the approach integrates time-varying asset returns and standard deviations, ensuring that strategies remain relevant in changing markets. Ultimately, this process culminates in extensive client reporting, tailored to meet the specific needs of each private client.