"The Late President George Q Cannon was once in a very tight place financially, and he determined to put aside all he could as tithing. One day the Bishop of his ward met him on the street and said: “Brother George, you are paying a pretty good tithing.” No Bishop,” he replied, “ I am not paying the tithing of that which I have received: I am paying the tithing of that which I would like to receive.” And sure enough the next year he had as much income as he had paid tithing on the previous year. "
So correct me if I am wrong, if I understand the principle from this story if I want to make more money next year, I should pay more tithing this year? I wonder if I were to start doubling my tithing donations this yeas, I would get a raise (possibly double my salary) next year?