You must file your Maryland Amended Form 502X electronically to claim, or change information related to, business income tax credits from Form 500CR. If you are a Maryland resident, file Form 502 and 502B.If you are a Maryland resident and need to amend your return, file Form 502X. The form and instructions for completing the form are available here on the State of Maryland Court's website. Complete this form to apply for, renew, replace, covert from out of state, or reinstate a learner's permit, driver's license, or Mass ID. Complete this form if you mailed one party's court documents to the other party. Complete ALL blanks and attach the original return receipt (green card). Maryland residents can amend their income tax return with a form 502X. This document can be obtained from the website of the Maryland comptroller. Log into your account and upload documents using the link in My Inbox.