To figure out the number you’ll need to retire comfortably, Robbins recommends that you take it in several steps: calculate how much money it takes to maintain your current lifestyle, multiply that total amount by 20. The plans that Robbins recommends retirees or those who are starting to think about retirement include traditional ones such as a 401(k), an IRA, and a Roth IRA. Knowing how much of your retirement plan will be going to taxes each year will help you plan accordingly versus getting a surprise tax bill.