You may file a claim for refund using CDTFA's online services. To submit a claim for refund, simply login using your username and password.Provide us a written statement with supporting documents listing the facts to support your claim. This request form may be mailed, faxed or emailed. Please note there is no public counter available at the address below. Begin the filing process as you would with any other filing and select "Request for Refund" as the Document Type from the list of options in the dropdown. CalSTRS a written request to cancel your refund. Enter your bank account information, click Continue; Confirm banking information and click Complete. A protective claim for refund may be in the form of amended return or a letter. . Write Protective Claim in red across the top of the amended return or letter .