Summary Discover the key Maryland laws taking effect October 1, 2025 — from child support and custody updates to tenant protections, hospital debt relief, cannabis reforms, traffic penalties and more. Family Law and Child CustodyParents who owe child support could see a new deduction when their income is calculated. When courts calculate child support, they don’t just use a parent’s raw income: they use something called adjusted actual income. That’s the parent’s income after subtracting certain allowable deductions such as taxes, health insurance premiums and more. Example: A father is in court for child support for one child.