How do I go over my return, I think I made an error, I haven't filed yet, but did pay

[jlharkness]

if I have already paid, but have not filed, can I make changes

[DoninGA · Accepted solution]

When you sign onto your online account and land on the Tax Home web page, scroll down and click on Add a state.  See screenshot

This will take you back to the 2018 online tax return where you can make any changes needed before filing.