An employer sponsored retirement savings account could be one of your best tools for creating a secure retirement. It provides two important advantages. First, all contributions and earnings are tax deferred. You only pay taxes on contributions and earnings when the money is withdrawn. Second, many employers provide matching contributions to your account, which can range from 0% to 100% of your contributions. Use this calculator to see how increasing your contributions to a 401(k), 403(b) or 457 plan can affect your paycheck as well as your retirement savings. This calculator has been updated to use the new withholding schedules for 2010.