比如 Fidelity 在9-10月份就給出大概的distribution.

https://www.fidelity.com/mutual-funds/information/distributions#/?table=actuals

https://www.fidelity.com/bin-public/060_www_fidelity_com/documents/mutual-funds/Cap-Gains-Q-A.pdf

Vanguard 也一樣會提供estimate