[Avodah] Whether a super-rich person may give more than 20% to charity

[Moshe Feldman]

According to S"A YD 249:1: One should not give more than 20% of
his earnings, lest he become poor and dependent upon the community.
However, he is permitted to give away as much as he wishes at the time
of his death, because at that point, that fear no longer exists. (This
is also implicit in Kesubos 67b.)

A number of achronim have written that a super wealthy individual
("ashir muflag") is not bound by the 20% limit, because he has no fear
of becoming poor. See Chochmas Adam (244), Chofetz Chaim (Sefer Ahavas
Chesed 20:1), Minchas Yitzchak 5:34 (par 2), and others cited in Shu"t
Ateres Paz, chelek rishon, krach beis, YD, he'aros siman 10 he'ara 4.
The only one who argues with this is Igros Moshe YD 1:143. IMHO, Minchas
Yitzchak addresses the arguments of the Igros Moshe quite convincingly.

Kol tuv,
Moshe