What should taxpayers do if they made an error on their tax return, forgot to claim a deduction, or received a late W-2?
Taxpayers can correct their California tax return by filing Form 540X, Amended Individual Income Tax Return. Amended tax returns take longer to process than original tax returns. For simple math errors or missing documents, taxpayers generally do not need to file amended tax returns, as we typically correct math errors when we process tax returns. We will contact taxpayers about missing documents.
