The way e-filing works is that the IRS or the state defines an XML schema which lists the mandatory and optional tags and their data that make up a valid data set for a tax return. When TurboTax is finished running, it has created a data set in this format. Note that there are no forms in this data set, just tags (think: <xml>).
So in order for TurboTax to be about to add the equivalent of a paper document to a tax return, the IRS must create the ability to accept it on their end, so TurboTax can create it on our end.
It's not just up to TurboTax...
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