How is the same investment taxed differently in a brokerage account versus a Roth IRA?

In a taxable brokerage account you owe tax along the way: dividends and interest are taxed yearly, and you pay capital gains tax whenever you sell at a profit. In a Roth IRA, the same investments grow completely tax-free – no annual tax on dividends, no capital gains tax on sales inside the account, and qualified withdrawals in retirement are entirely tax-free. That's a huge difference over decades. The trade-off is that Roth contributions come from already-taxed money and are capped ($7,000, or $8,000 if 50+, in 2025) with income limits, while a brokerage account has no limits and full liquidity. The strategy most use: max tax-advantaged accounts first, then invest beyond them in a taxable account holding tax-efficient index funds. Compare account types at wealthserene.com/tools/roth-vs-traditional.