Intuit/TurboTax does not appear to have thought about this.
IRS does say that the minor should sign their own tax return if able. If they can't write, then a parent or guardian can sign. But even a 2 year old can click the "Submit" button on a screen, which is effectively "signing" an electronic return.
One approach would be to complete the tax return as if the child were filing it themselves. Then go into Forms mode and find the Info Wks, under Part V, and add yourself as a Third Party authorized to discuss the return with the IRS.
When e-filing, TurboTax will ask for a driver's license or state ID. Use the minor's ID if they have one; or select the option that says that the taxpayer doesn't have a driver's license or state ID.
Finally, have the minor present to click "Submit" when the return is e-filed.
I think this method is acceptable, but would certainly like to hear what a tax expert or the IRS thinks.
