Per the IRS, if your parent's taxable income, filing status, or net unearned income of the parent's other children isn't known by the due date of your tax return, reasonable estimates can be used. If you are using estimates, make sure you write “Estimated” next to the appropriate line(s) of Form 8615.
Since you will be writing on the pages of the return, you will have to mail in your tax return and will not be able to e-file. When the correct information becomes available, you can file Form 1040-X, Amended U.S. Individual Income Tax Return to report the accurate information.
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