Becuase you have already filed your personal return, you will need to complete an amendment to include your business return or information from the business return, if an S or C Corporation. If you are expecting a refund, I would prepare the amendment and send in only after I have received the refund. There is no cost because you have to mail it in. For more information as to when to amend and how to do so, please view TurboTax FAQ Do I need To Amend My Return. At the end of the answer, there are also links, in blue, on how to do so in TurboTax.
It would be best to wait until you have received your refund from the tax return already submitted (if you are expecting one). This will prevent delays in receiving your refund and you generally have 3 years to amend, from the day your taxes are due or 2 if you paid taxes due to owing taxes. There usually are no penalties if you will receive a refund.
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