Louisiana's sales tax collections from internet purchases have increased dramatically, even though the system only involves out-of-state retailers voluntarily remitting taxes.

The revenue department reports that Louisiana received $740,000 in sales tax collections from large out-of-state companies for online sales from July to September.

Luke Morris, department assistant secretary, says that doubled to $1.4 million from October to December.

Voluntary remittance of sales tax has grown since a June ruling from the U.S. Supreme Court. That decision paved the way for states to begin requiring tax collections for online purchase from retailers that didn't have a physical presence in a state.

There are currently 592 of these companies that have registered as "remote sellers" and are collecting sales taxes for online purchases.