Early retirement is expensive: as a rule of thumb, each additional year of retirement prior to regular retirement age costs about one year's salary. This is because, first, you must compensate for your loss of earnings, and second, you are already drawing benefits from your pension fund, which will consequently be lower than in the case of regular retirement for the remainder of your life. Conversely, the OASI pension is usually only paid out after you have reached regular retirement age, so you must also bridge the costs incurred by this gap. You will also have to pay OASI contributions for non-employed persons – unless your spouse's income is still subject to OASI contributions. In addition, your tax situation will change, perhaps also your living situation. All these factors have an impact on your income.
The exact costs of early retirement can only be determined in the course of financial or pension planning. You can reach an approximate figure by multiplying the net annual salary on your salary statement by the number of years before the regular retirement age that you plan to retire.