I went on deployment in 2018 for 5 months but never filed my taxes for that year. I already filed my taxes for 2019 because I work now. How do I do back taxes for 2018?
To complete and file a 2018 tax return using TurboTax you would need to purchase, download and install on a personal computer one of the 2018 desktop editions from this website - https://turbotax.intuit.com/personal-taxes/past-years-products/
A 2018 tax return can only be printed and mailed, it cannot be e-filed.