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The issue with your existing LLC is that it is set up for a different purpose. Since doing re-selling and receiving profit will now put in funds that are not related at all to the IRA, doing so, while not inherently illegal, will expose you to an almost certain risk of audit and additional questions. Since the purpose of your new business is different from your IRA, getting a new LLC set up is frankly more professional and less likely to create red flags with the IRS or with the state tax bureaus.