As a SAHM, I had no income to tithe on...however I think the important question that is not being addressed here is...In mormon belief, if you have not paid your required tithing and during tithing settlement (do other churches require you to attend a "tithing settlement"?) you do not vow that you HAVE paid the requisite tithing, will you be allowed to enter the mormon temple in order to take part in the necessary rituals and man-made covenants that will allow you to reach exaltation (mormon equivalent of salvation)?
The answer is NO!
The important question to ask here is, is full payment of tithing coerced by the mormon church? It is if you wish to be "saved".
The implication is always there that GOD will know if you lie about paying your full tithe and the rituals and covenants will be invalidated and the doors of salvation closed to you.
Exactly, Mormonism teaches that paying the tithe is an eternal law that is required for salvation.
“The law of tithing is an eternal law. The Lord Almighty never had his kingdom on the earth without the law of tithing being in the midst of his people, and he never will. It is an eternal law that God has instituted for the benefit of the human family, for their salvation and exaltation.” (Journal of Discourses 14:89.)
By contrast, Christianity teaches that we are to be good stewards of the resources that God has put under our control (Matthew 25: 14-30), but we are not required to pay a certain percentage of our profit or to declare our faithfulness to a church leader.