If you mean you had self-employment earnings to add to your personal tax return, you will need to amend the return you filed to add your business receipts and expenses. You will see an option to amend your return when you log into your TurboTax program.
If you mean you have a partnership or corporate return you need to file, you can do that separately from your personal tax return by downloading the TurboTax Business product. If you prepare an S corporation or Partnership return, you will generate a Schedule K-1 that you will use to enter you share of the business income and related items on your personal return, so you may need to amend your personal return to do that.
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