What is form 40?

[ilovezombies1301]

What is it? Why can't I defile without it?

[SweetieJean]

Sounds like a state form. In any case, efile is not open for 2016 yet. You must wait.

[VolvoGirl]

There's no hurry to file.  Turbo Tax won't start taking returns for a couple weeks and then they just hold them until the IRS opens Jan 23.

 The IRS will open efiling on Jan 23, 2017  https://www.irs.gov/uac/2017-tax-filing-season-begins-jan-23-for-nations-taxpayers-with-tax-returns-...    

 IRS warns of refund delays  https://www.irs.gov/individuals/refund-timing