Can I file my taxes from last year and this year?

[GretchenLO]

Yes, you can file the current year return using TurboTax Online and this can be done prior to filing your previous years return.

Prior year tax returns can only be printed and mailed, they cannot be e-filed. You would have to buy the prior year programs.  They only sell back to 2014.

https://turbotax.intuit.com/personal-taxes/past-years-products/