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What is a reasonable rate of return and fee structure for a Roth IRA?
A Roth IRA is just an account wrapper.  Inside a Roth IRA you can have a plain 0.1% savings account, or a brokerage account, or an annuity or whatever.  There's no rate of return for a Roth IRA. That particular calculator seems to assume you'll be wrapping a brokerage account in a Roth IRA and investing in the stock market.  Over a long period 6% is probably a reasonable rate of return considering the S&P 500 has returned about 7% over the last decade.