To file a separate state return Online you will also need to file a separate Federal return.
To file Married Filing Separate (MFS) for both Federal and State returns, select MFS In the personal info section.
If you want to file Married Filing Joint (MFJ) for your Federal Return & MFS on your state return, use TurboTax Download https://ttlc.intuit.com/replies/3301995
Edited 1/2/18 11:56 a.m.