Estimated Net Income (ENI) is a financial measure used to calculate an estimated net income for a certain period of time. It is calculated by subtracting expenses from the revenue generated during that period. ENI is important as it helps businesses make informed decisions about their financial position and how much they can invest in future endeavors. This estimation gives business owners an idea of whether or not their operations were profitable and if their resources were used to the fullest potential. Knowing the estimated net income for a given period of time puts businesses on the path to overall financial success.