Yes, you can file an amended CA return for tax year 2020, but it must be postmarked by April 15, 2024. You will prepare a corrected Form 540 and Schedule X. You will enter your explanation for the change in your income on Schedule X. TurboTax will guide through the process.
CA doesn't have guidelines regarding mailing multiple returns in the same envelope, but the IRS advice is to mail returns in separate envelopes, so I would follow that advice.
Don't forget to sign your returns, attach a copy of your federal return, and include the documentation with your forms.
Refer to the TurboTax articles: How do I amend a California state return in TurboTax Online? and How do I amend my state tax return? for instructions,
You can also review the CA Franchise Tax Board website Amend an income tax return for additional information.
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