Roth 401(k) These are relatively new and not yet widely available. It is worth comparing these bullet points to those of the Roth IRA we’ll discuss shortly. Contributions you make are NOT deductible from your income for tax purposes. All earnings on your investments are tax-free. All withdrawals after age 59 1/2 are tax-free. Once you reach age 70 ½ RMDs take effect. There is no income limit for participating.