Q. Sometimes I do a commercial activity as a chessed. For a variety of reasons, I
let the person I do it for know that 100% of the money they give me will go to
tzeddakah (charity). Can we both count this as maiser money?
A. Horav Shlomo Miller Shlit’a pointed out that the person you do your
commercial activity for, is obviously receiving a benefit and he is paying you
for it. The only one contributing to Tzedakah is you, as you can do with that
money as you please, not him. So only you can count it as "Maaser Money". He
would be considered though as a "Mesaayeah Lidvar Mitvah", somebody who
helps his fellow do a Mitzvah.