TOPEKA, Kan. (AP) — Kansas plans to impose what some tax experts said Wednesday would be the nation's most aggressive policy for collecting state and local taxes on online sales, possibly inviting a legal battle.

The state Department of Revenue issued a notice last week saying any "remote seller" doing business with Kansas residents must register with the department, collect state and local sales taxes and forward the revenues to the state, starting Oct. 1. It cites a U.S. Supreme Court decision last year allowing states to collect sales taxes on Internet sales.

Most states now have policies t...