You need to have a
copy of your last year's return to get your AGI that you need to e-file this
year. You can print or download a copy of your 2015 taxes that you filed in
TurboTax Online last year, then find your AGI. See the TurboTax FAQ below
on how to get a copy of your return and
on where to find your AGI on your forms.
https://ttlc.intuit.com/replies/3301525
https://ttlc.intuit.com/replies/3301618
You can also get
free transcripts of your federal return from the IRS - Get Transcript
To
order a copy of your return from the IRS you may use this form, there is a
$50.00 fee
Request for Copy of Tax Return