Idaho Code § 50-2902
It is hereby found and declared that there exists in municipalities a need to raise revenue to finance the economic growth and development of urban renewal areas and competitively disadvantaged border community areas. The purpose of this act is to provide for the allocation of a portion of the property taxes levied against taxable property located in a revenue allocation area for a limited period of time to assist in the financing of urban renewal plans, to encourage private development in urban renewal areas and competitively disadvantaged border community areas, to prevent or arrest the decay of urban areas due to the inability of existing financing methods to promote needed public improvements, to encourage taxing districts to cooperate in the allocation of future tax revenues arising in urban areas and competitively disadvantaged border community areas in order to facilitate the long-term growth of their common tax base, and to encourage private investment within urban areas and competitively disadvantaged border community areas. The foregoing purposes are hereby declared to be valid public purposes for municipalities.
Idaho Code § 50-2902