Can I file a previous year tax return?

[LindseyLO]

Yes you can.

https://ttlc.intuit.com/replies/3301607

[ShawnaD]

Please note that prior year returns cannot be completed in TurboTax Online, you will need to purchase the Desktop programs n order to complete the filings and mail them to the IRS (prior year returns also cannot be e-filed). 

Instructions for filing a prior year return can be found here: https://ttlc.intuit.com/replies/3301770