Amending a Tax Return

Hello,

 

I am currently a resident of California and have a W2 job here. However, I also have a part-time, remote W2 position in Missouri. Since this job in Missouri is remote and I don't have any state taxes withheld, I don't have to file a Missouri state tax return. However, I didn't realize this in 2021 and 2022 when I filed my taxes with Turbo Tax. I had the same residency situation in those years too.

 

How can I go about amending my previous years tax returns so that I can be refunded the Missouri state tax I paid?

 

Also, is it correct that I only need to amend the Missouri tax return and not the federal or California state tax returns? Would amending the Missouri return impact the California state return?

 

Thank you.