A 401(k) contribution can be an effective retirement tool. As of January 2006, there is a new type of 401(k) – the Roth 401(k). The Roth 401(k) allows you to contribute to your 401(k) account on an after-tax basis – and pay no taxes on qualifying distributions when the money is withdrawn. For some investors, this could prove to be a better option than contributing on a pre-tax basis, where deposits are subject to taxes when the money is withdrawn. Use this calculator to help determine the best option for your retirement.