How much money is required to save from current income, above prudent reserve, to invest for retirement? Of course, the answer depends on expected lifestyle in the future. There are many factors to consider when calculating retirement income. For example, we must consider the basics: birth date, normal retirement age, current savings balance, monthly contributions, and rate of return. We also must be aware of gender, health and wellness, current income, liquid assets, net worth, residence, insurance, cash flow, account types, risk tolerance, investment objectives, time horizon, source of funds, education and experience, diversification of assets, etc. We must also estimate life expectancy and normal retirement ages along with distributions rates. We must also estimate cost of living adjustments, annual returns, and risk tolerance. These are some of the factors to consider when calculating retirement income.