There are certain forms that will render your tax return ineligible to e-file. Please see this for more information: When a tax return can't be e-filed no matter what you do.
Additionally, please review this to see which forms may not be supported or ready to e-file as you may not be able to e-file yet if the form(s) are not ready: IRS forms availability table for TurboTax individual (personal) tax products
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