When a child has a disability, the divorce decree becomes more than a snapshot of the family’s current reality — it becomes the financial engine that will shape the child’s stability for decades. The most costly mistake attorneys make is treating the case as if the child’s needs end at age 18. Benefits shift, income rules change, and support structures evolve across adulthood. If the decree isn’t built around the child’s lifetime financial trajectory, predictable transitions at ages 18, 22, and beyond can trigger benefit loss, service gaps, and long‑term instability. Attorneys who plan for the full lifespan protect not only the child’s future, but their own professional integrity.