HB 4385 defines what constitutes a voter's residence for election purposes in Texas. It states that a person is considered to have left their home permanently if they don't live there for 180+ days in a year, with exemptions for military members, full-time students on campus, and legislators. The bill also prohibits establishing residence in commercial buildings or recreational vehicles, though voter registrars may consider documents like driver's licenses, utility bills, or vehicle registration to verify residence for recreational vehicles. The law applies only to elections after its effective date of September 1, 2025.