What are you trying to do? Were you married at the end of 2018? If you were married at the end of 2018 then your only choices were to file as married filing jointly or married filing separately for 2018. But now it is too late for you to get a refund for 2018 even if you file a 2018 tax return. Your refund has been forfeited. If you owe tax to the IRS or to the state for 2018, you still have to pay them.
TurboTax does not have software for 2018. If you still need to file a 2018 return you can get the paper forms from the IRS and the state and prepare them by hand to mail in. Mail your payment with the return. You will be billed later for any late filing penalties and interest owed.
2018
Form 1040
Instructions for Form 1040 (HTML)
https://www.irs.gov/pub/irs-pdf/f1040s1.pdf
https://www.irs.gov/pub/irs-pdf/f1040s2.
https://www.irs.gov/pub/irs-pdf/f1040s3.pdf
https://www.irs.gov/pub/irs-pdf/f1040s4.pdf
https://www.irs.gov/pub/irs-pdf/f1040s5.pdf
https://www.irs.gov/pub/irs-pdf/f1040s6.pdf
https://ttlc.intuit.com/community/state-taxes/help/how-do-i-contact-my-state-department-of-revenue/0...
**Disclaimer: Every effort has been made to offer the most correct information possible. The poster disclaims any legal responsibility for the accuracy of the information that is contained in this post.**
