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Cost Basis in Retirement Accounts Irrelevant?
Cost basis is irrelevant because the entire distribution is taxed as ordinary income even if the custodian distributes stock or mutual fund shares to you. Such distributions save you the brokerage fees that you would incur had you taken a cash distribution and promptly bought the shares outside the retirement account for yourself but they have no effect on the tax treatment of the distribution: the market value of the shares distributed to you is taxed as ordinary income, and your basis in the newly acquired shares outside the retirement account is the market value of the shares, all prices being as of the date of the distribution.