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.DIRECTIONS. To sign up for Direct Deposit, the payee is to read the back of this form and fill in the information requested in Sections 1 and 2. Direct Deposit Authorization Form (1TAC 55.803). This form is used to set up direct deposit for child support payments. Direct Deposit Forms (Alphabetical). Note: Forms must be downloaded and opened using Adobe Acrobat Reader if you want to fill them out electronically. Complete this section only if you want to start, cancel or change the amount of a savings or discretionary allotment - see instructions on back of form. Complete BOTH sections below and return this form, ONLY if you wish to enroll in Direct Deposit. 2.