In your original question here you didn't say that the problem involved an Opportunity Zone investment. In the question that you posted last week we told you that TurboTax does not support deferring gain by investing in an Opportunity Zone. Was it a code Z on Form 8949 that TurboTax was saying was invalid? TurboTax does not allow code Z. There is no way to enter it. You will not be able to file your amended return with TurboTax.
As mentioned in the other thread, some people have tried various workarounds. It's not clear how successful any of them were in filing a correct tax return and having it processed by the IRS. As you were told last week, the workarounds can only be done in the CD/Download TurboTax software, not in TurboTax Online, and they cancel the TurboTax accuracy guarantee. One workaround that was referenced in your other thread last week requires using a PDF editor to fudge the forms that TurboTax creates. And all of the workarounds require filing by mail. There is no way to e-file with TurboTax with an Opportunity Zone investment.
