Can you file your 2018 Return before your 2016 & 2017 Returns?

Yes, you can still file your timely 2018 Tax Return before midnight tonight (or an extension).  Then, you will want to file the missed tax returns from 2016 and 2017

Yes, you can still file your timely 2018 Tax Return before midnight tonight (or an extension).  Then, you will want to file the missed tax returns from 2016 and 2017

Here is some additional information, however, about the advantages of filing your prior returns first:

https://ttlc.intuit.com/replies/4186200