Direct Deposit Authorization Form (1TAC 55.803). This form is used to set up direct deposit for child support payments.Direct deposit takes 3 to 5 business days. Complete BOTH sections below and return this form, ONLY if you wish to enroll in Direct Deposit. 2. Your name must appear on your bank or credit union account. How do I sign up for direct deposit? Parents who receive child support payments through the TxCSDU can fill out and submit a direct deposit authorization form. To sign up for direct deposit, fully complete, sign, and date the attached Texas Child Support Disbursement Unit Direct Deposit. Complete your Direct Deposit Enrollment form carefully. Be sure to fill in ALL the required information.