A distribution from your traditional IRA could cost you if you’re not aware of your responsibilities. Many investors are saving up for their retirement in workplace accounts like 401(k)s. Those administrators handle tasks that IRA custodians don’t. And it’s up to you to take charge and keep track of your hard-earned money, so you’re not taxed twice. Denise Appleby is known as “The IRA Whisperer.” The Morningstar contributor has written about how to protect your IRA from costly mistakes.