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Why invest in IRA while a low-cost index fund is much simpler?
Is that basically it? Trading off between withdrawing-anytime vs paying-capital-gain-tax? No. Another significant factor is dividends. In an IRA they incur no immediate tax and can be reinvested. This causes the account value to compound over the years. Historically, this compounding of dividends provides about half of the total return on investments. In a non-IRA account you have to pay taxes each year on all dividends received, whether you reinvest them or not. So outside of an IRA you have a tax drag on both capital gains and dividends.