Schedule X is used to report the changes to your return as originally filed. Form 540X only applies to tax year 2016 and earlier tax years.
Do you have a Schedule X included in your return? If so, this is the form that needs to be sent to the Franchise Tax Board, along with the Amended Form 540.
Please see the link below for more details on what needs to be included as well as where to mail your Schedule X with amended return to.
Information on amending a CA return
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