What do I need to file a California State Tax refund?
In California, it is necessary for taxpayers to indicate the exact amount owed to them in order to apply. Besides the exact amount, the only data you need is your Social Security Number, the numbers in your mailing address, and your zip code. Once you have your data, you can do it in two ways: online (e-file) on the State of California, Franchise Tax Board page, or if you feel more comfortable doing it on paper, you can do so as well.