
“The law is simply stated as ‘one-tenth of all their interest.’ Interest means profit, compensation, increase. It is the wage of one employed, the profit from the operation of a business, the increase of one who grows or produces, or the income to a person from any other source. The Lord said it is a standing law ‘forever’ as it has been in the past” (in Conference Report, Apr. 1964, 35).
The First Presidency:
“The simplest statement we know of is the statement of the Lord himself,
namely, that the members of the Church should pay ‘one-tenth of all their
interest annually,’ which is understood to mean income. No one is justified in
making any other statement than this” (First Presidency letter, Mar. 19, 1970;
see also D&C 119:4).