As a Christian, how should one tithe on their income as a real estate investor? Gross profits before expenses work differently when it comes to a real estate portfolio. How do we honor God when real estate investing does not produce a straightforward income? Then we committed to banking 10% of everything else (a tithe above a tithe, I guess) and prayed separately for places to give. That family got the last check—and that was also the last time we ever had a tithe above a tithe.