I received a letter from the IRS stating I didn't file my 2017 state tax return. How do I do That?

 

After you file

The IRS is Federal; they do not care about state returns. Is the letter from a state tax agency?

After you file

Yes, from the State of California

After you file

Not from IRS but from the FTB

After you file

Did you start a 2017 CA return in TT?

After you file

Yes