High-Water Mark Calculator

What is a High Water Mark?

A high water mark (HWM) is the highest peak in value that an investment fund or account has reached. This term is most commonly used in the context of hedge funds, which charge a performance fee based on the profits generated. The high water mark ensures that the manager does not get paid for poor performance. If the fund loses money, the manager must get the fund above its previous high before earning a performance fee on new profits.

Why is it important?
Without a high water mark, a fund manager could earn performance fees simply by recovering losses. For example, if a fund drops 20% in one year and then gains 25% the next year, the fund has only recovered to its original value. The high water mark protects investors from paying a performance bonus for merely making up for prior losses.

The Mathematical Formula:
The calculation to determine fee-eligible profits with a high water mark is straightforward:
New NAV = Current NAV × (1 + Return)
Eligible Profit = Max(0, New NAV - Max(Current NAV, High Water Mark))
Performance Fee = Eligible Profit × (Performance Fee % / 100)

This calculator dynamically visualizes where the projected NAV stands in relation to the high water mark. The chart shows the current NAV and the projected NAV, with a clear reference line indicating the HWM. If the projected NAV does not cross this line, no performance fee is earned.

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