Why on earth go to the trouble of calculating basis for every single dividend reinvestment (as I have seen advised to do)? (money.stackexchange.com)
The idea is that if you've held the shares six months, that's long enough so that your loss (if you have one) probably relates to genuine changes in the value of the mutual fund rather than the effect of a single dividend. (fairmark.com)
The fund makes a single dividend payment to investors each year. (etfbase.com)