Assuming that you do not exceed the maximum transaction lines, it is possible to manually enter each transaction line from an IRS form 1099-B into either TurboTax Desktop or TurboTax Online. In such a case, if the information has been correctly entered, no report or attachment must be remitted to the IRS.
You may manually enter summary information from an IRS form 1099-B or Schedule 8949 Sales and Other Dispositions of Capital Assets into either TurboTax Desktop or TurboTax Online. In this case, the IRS wants to see a copy of the form that you input.
TurboTax Desktop requires that you to mail a paper copy of the form to the IRS attached to an IRS form 8453.
TurboTax Online allows you to upload a .PDF of the form into the software and the .PDF is remitted it the IRS with your tax return.
Retain any documentation that you receive, be it a .CSV or an IRS form 8949, should a tax authority have a question at a later time.
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