A flat rate, not a sliding scale
Siblings are exempt — genuinely unusual
Siblings pay nothing in Maryland, while a sibling inheriting in New Jersey owes 11%-16% and in Pennsylvania owes 12%. Maryland's exempt list runs unusually wide: spouse, children and other lineal descendants, the spouse of a child, parents, grandparents, stepchildren, and siblings all pay zero.
The only state that charges both taxes
Maryland is the only state with both a state estate tax and a separate inheritance tax. When the decedent is unmarried and a meaningful share passes to non-exempt beneficiaries, the estate can pay Maryland estate tax first, and each non-exempt heir then pays 10% inheritance tax on top of what they receive — see our Maryland Estate Tax Calculator for the other half of this picture.