Which form is utilized to designate and/or change a member's legal residence for SITW purposes?

The correct choice is DD Form 2058, which is specifically designed for service members to declare and change their legal residence for state income tax withholding (SITW) purposes. This form allows military personnel to ensure that their state's tax obligations are appropriately managed, reflecting their current residency status.

Using DD Form 2058, members can communicate their residency changes to the relevant authorities, ensuring compliance with state tax laws and potentially benefiting from tax exemptions tied to their military service. This form plays a crucial role in federal and state tax administration for active-duty members and is tailored to account for the unique circumstances of military service, including frequent relocations.

Other forms listed serve different purposes: the W-5 is used for certain tax withholding adjustments, DD Form 214 is a certification of discharge from active military service, and SF-50 is related to personnel action within federal employment. None of these alternatives are designed for declaring or changing legal residence specifically for tax withholding, making DD Form 2058 the appropriate choice.