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Stocks taxed just for selling, or just when withdrawing?
Taxes are triggered when you sell the individual stock.      The IRS doesn't care which of your accounts the money is in.  They view all your bank and brokerage accounts as if they are one big account mashed together.   That kind of lumping is standard accounting practice for businesses. P/L, balance sheets, cash flow statements etc. will clump cash accounts as "cash".  Taxes are also triggered when they pay you a dividend.  That's why ETFs are preferable to mutual funds; ETFs automatically fold the dividends back into the ETF's value, so it doesn't cause a taxable event.  Less paperwork.  None of the above applies to retirement accounts.  They are special.  You don't report activity inside retirement accounts, because it would be very hard for regular folk to do that reporting, so that would discourage them from taking IRAs.   Taxes are paid at withdrawal time (or in Roth's, never.)