I missed the step to exclude US Gov't interest from 1099-DIV. How to amend tax return now to get credit for $ paid to State?

Hello All,

First time posting here.   I'm using the Desktop version of TurboTax.

 

I just realized  (after submitting my 2022 return), that I needed to take another step when importing my 1099-DIV to be able to exclude some U.S. Government interest (from a Treasury Inflation-Protected Security - TIPS) that I owned.  

 

Missing this step meant that this interest was fully taxable on my California State tax return, when it should not have been (TIPS are Federally taxable, but not State taxable).

 

I see now there is a step after the 1099-DIV import that asks if any of "these uncommon situations apply to you" and that I should have checked the box saying that a "portion of these dividends is U.S. Government Interest".

 

How can I fix this and get the tax I mistakenly paid to my state for this interest? 

 

I can go back into TT and check the proper box for the 1099-DIV and that should carry over to my State return to reduce my tax owed there, but do I also need to send the Federal IRS an amended tax return, too?  The amount owed/due won't change at the Federal level, so not sure this is required?

 

And would I need to send along to the state a new Federal return as well?

 

Uggh.. This will be my first amended return in decades of filing! :(

Thanks a  lot for any guidance!