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How do 401k handle rate of return
A 401(k) is an investment just like any other investment. You generally get two types of return lumped into that number, but there can be more and you should read your funds prospectus carefully. If you aren't investing in direct companies, you're using mutual funds for instance, then you should read the funds prospectus to see how they handle these situations for the underlying securities they hold for you. Although I think this is the basic answer to the question as you asked.