You can file in any order you choose at this point. Each tax year is separate from the other. You will need to download the 2016 and 2017 TurboTax program to enter your 2016 and 2017 W2's on your 2016 and 2017 tax returns as they can not be filed online. Tax laws change every year so you have to use the right program for the right year.
You also cannot include your 2016 or 2017 W2's on this years tax return.
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