You will not need to amend the California taxes for the Form 8606. You will keep a copy of the 8606 form with your other 2020 tax records in case there is ever a question about it.
Use Form 8606 to report: Nondeductible contributions you made to traditional IRAs. Distributions from traditional, SEP, or SIMPLE IRAs, if you have ever made nondeductible contributions to traditional IRAs. Conversions from traditional, SEP, or SIMPLE IRAs to Roth IRAs. Distributions from Roth IRAs.
