This is when you take funds from one retirement savings account, such as a 401(k), and move it over to another, such as a Roth IRA. You’d do this if you no longer need the old account but want to repurpose the funds to avoid taxes or withdrawal penalties. As an example, let’s say you had a 401(k) at your job, but you’ve decided to quit. It may be smart to roll your funds over into your IRA (if you have one) to preserve your money.