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Measuring Tax Alpha

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Measuring Tax Alpha

Aug 15, 2024

Wealth managers can use the concept known as tax alpha in conjunction with their existing performance-attribution framework to explain a client’s after-tax performance. Often the framework requires their making several assumptions with no clear guidance about how to specify them.

We propose two frameworks for the calculation of tax alpha — a shadow benchmark and an event-based approach — to provide transparency around an after-tax attribution calculation. The main difference between them is the choice of the reference portfolio. The approaches also differ in how they model client-directed actions, dividend payments and benchmark rebalancing. We further develop two versions of the shadow-benchmark approach. The following exhibit compares the approaches.

©2024 With Intelligence. Republished with permission from the Journal of Wealth Management, from: Laszlo Arany, Laszlo Hollo, Joseph Wickremasinghe and Raina Oberoi, “Measuring Tax Alpha,” Journal of Wealth Management 27, no. 2 (fall 2024).

Comparing how well the approaches meet the reference-portfolio assumptions

This exhibit compares the two versions of the shadow-benchmark approach with the event-based approach on how well they score on meeting the reference-portfolio assumptions. The reference portfolio is used in calculating the after-tax return of a client's investment portfolio.


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Research authors

  • László Arany, Executive Director, MSCI Research
  • Laszlo Hollo, Executive Director, MSCI Research
  • Joseph Wickremasinghe, Executive Director, MSCI Research
  • Raina Oberoi, Managing Director, MSCI Research

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