Re: Zakat minus Expenses
I do the same way too. Also, till my wife was in school, we calculated zakat as a family. Now that she is working we do it separately.
I have been using a spreadsheet to do the estimations by one Br. Arif Jameel. I can share it with you all, but it uses this approximation method. If br psyah comes up with a better one, I would like a copy too.