WASHINGTON (AP) – Attention online shoppers: The days of tax-free shopping on the Internet may soon end for many of you.

The Senate is scheduled to vote Monday on a bill that would empower states to collect sales taxes for purchases made over the Internet. The measure is expected to pass because it has already survived three procedural votes. But it faces opposition in the House, where some Republicans regard it as a tax increase. A broad coalition of retailers is lobbying in favor of it.