@tyler not that it matters, unless you count the LDS, no Christians are tithing anywhere near full 10%.
I remember taking Dave Ramsey's #FincialPeaceUniversity and he mentioned that people always argue whether the tithe is on the gross or the net pay and he said he wasn't going to get into that debate since none of you are doing it anyway, and just make sure you put it in the budget.
I looked up giving percentages online later comparing various churches and the only one that came remotely close was Mormons and I'm pretty sure they actually audit members finical records.