For a U.S. taxable investor, the ownership of shares in what is known as a "passive foreign investment company" or PFIC can prove to be very tax-expensive. The offshore feeder fund almost always meets the definition of a PFIC. An (onshore) master fund does not, so the transaction is set up so that the master fund is a partnership for U.S. tax purposes, which effectively provides insulation between the US based investor and the PFIC feeder.
"Master's Trust: What it is, How it Works, Types". Investopedia. Retrieved 2024-07-29. https://www.investopedia.com/terms/m/mastertrust.asp ↩