If you have already filed your return, you'll need to wait for your tax return to either be rejected or accepted, if it is rejected you can add your Schedule K-1, correct any other errors on the return and resubmit it.
If it is accepted, you will need to amend your return to include the Schedule K-1.
Amending won't delay your original refund. However, if you are expecting a refund, we recommend that you wait to amend until after the IRS has processed your original return and you have received your refund, feel free to cash or spend it while your amendment gets processed
Please see this TurboTax article for instructions on how to amend your tax return in TurboTax.
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