I'm working on my 2020 taxes and realized that I made a mistake in my documentation of a backdoor roth on my 2019 Form 8606. I've corrected it - and there's no change to the refund/amount due - but I'm not clear on what I have to file.
Can I just send in Form 8606 to the IRS, or do I need to do a 1040x?
I also filed state taxes in CA and LA. Do I need to send them Form 8606, too?
