Utilize your financial knowledge, give your answer or opinion to the input question or subject . Answer format is not limited.

401k compound interest vs other compound interest
A 401K (pre-tax or Roth) account or an IRA (Deductible or Roth) account is a retirement account. Which means you delay paying taxes now on your deposits, or you avoid paying taxes on your earnings later.  But a retirement account doesn't  perform any different than any other account year-to-year. Being a retirement account doesn't  dictate a type of investment. You can invest in a certificate of deposit that is guaranteed to make x% this year; or you can invest in stocks, bonds, mutual funds that infest in stocks or bonds. Those stocks and bonds can be growth focused, or income focused; they can be from large companies or small companies; US companies or international companies. Or whatever mix you want. The graph in your question shows that if you invest early in your adulthood, and keep investing, and you make the average return you should make more money than starting later. But a couple of notes:  So to your exact questions: An S&P 500 investment should perform exactly the same this year if it is in a 401K, IRA, or taxable account With a few exceptions:  Yes any investment can lose money. The last 6 months have been volatile and the last month and a half especially so. A retirement account isn't any different. An investment in mutual fund X in a retirement account is just as depressed a one in the same fund but from a taxable account.