The amount you need to save or regularly invest for your retirement will depend on your current income and retirement needs. Determine retirement needs - While determining your retirement needs, you need to consider your current lifestyle, routine expenses, medical expenses, and other specific financial needs. In addition, you need to account for the inflation rate to adjust the requirements to suffice for the needs pertaining to later years of life after retirement. Find the amount to save - Further, consider your current income and expenses to determine how much you can save for the above-determined retirement needs regularly over the desired period without affecting your lifestyle. It can be 10% for a 20-year-old, 15% for a 30-year-old, and so on. The desired period can be the number of years to retirement or until you accumulate the required corpus. Click here to learn more about how to calculate the retirement corpus.