“Doing business” means having a presence in a state for the purpose of jurisdiction for legal matters and a nexus (connection) for tax purposes.

The term “doing business” means having a nexus (a presence) in a state for tax and legal purposes.

To do business in a state you may have to register with the state or a locality or both.

The definition and requirements for doing business in a state is determined differently by each state.

A company may “do business” in several states, registering separately in each according to state laws.