WASHINGTON — States will be able to force more people to pay sales tax when they make online purchases under a Supreme Court decision Thursday that will leave shoppers with lighter wallets but is a big financial win for states.

Consumers can expect to see sales tax charged on more online purchases — likely over the next year — as states and retailers react to the court’s decision, said one attorney involved in the case.

The Supreme Court’s 5-4 opinion Thursday overruled a pair of decades-old decisions that states said cost them billions of dollars in lost revenue.