Mormons pay the ancient law of Tithing that is found in the Old Testament. Through paying tithing, members are promised amazing blessings.
With money from tithing paid by members, the Church of Jesus Christ of Latter-day Saints builds up the Kingdom of God on earth. This means Temples are built, Books of Mormon are printed, and the poor are given help, just to name a few things (there are many other ways the Mormon Church uses tithing money).
The Church of Jesus Christ of Latter-day Saints also has many businesses that they own that make profit. The Church then takes that money and uses it for building up the Kingdom of God just like tithing money is used.
When members of the Church pay tithing they are given incredible blessings. In Malachi 3:10 it says: “… if I will not open you the windows of heaven, and pour you out a blessings, that there shall not be room enough to receive it." Mormons everywhere around the world pay tithing and see the blessings that come from it