JTWROS is a form of joint ownership with a survivorship feature. Two or more people own an asset together and the survivor of them owns the property outright. For example, Joe and Sam own a house as joint tenants with a right-of-survivorship. Joe dies in a skiing accident. Now, Sam owns the house automatically by operation of law. There’s some “lawyer math” included in JTWROS. Each owner owns 100% of the property, no matter how many joint tenants there are, 2 or 20.