 are becoming the biggest source of income in retirement for my clients. It used to be that people had pensions. A lot of people had pensions. That's becoming less and less popular or less and less common. So 401Ks have kind of taken over. And a traditional IRA and a 401K plan is made up of pre-tax money, so it's fully taxable when you take distributions. There can also be tax penalties if distributions are taken before age 59 1⁄2.