Your 401(k) is one of your most powerful tools to escape the rat race and reach financial independence. But like any tool, using it correctly makes a big difference. Even smart savers sometimes miss out on thousands of dollars (and years of growth) because of a few small mistakes. Here are 10 common 401(k) mistakes  — and how to make sure you’re getting the most out of your plan. NOT UNDERSTANDING YOUR 401(k) TYPE When 401(k)s were first introduced, there was only one type. Y