S.3670: A bill to regulate certain State and local taxation of electronic commerce, and for other purposes.

Prohibits a state from imposing any tax on electronic commerce (i.e., transactions conducted over the Internet or through Internet access) of any person unless that person has a physical presence in the state during the period to which such tax applies or is incorporated or domiciled in such state. Sets forth criteria for determining physical presence, including: (1) being physically in a state or assigning one or more employees to a state;...

(Source: Library of Congress)