What is the "Date of first sales after completing this registration?"

Answer:  This is the date you expect to have a sale or sales in any of the Streamlined full member states.  This is the date you will begin collecting tax for all full member states in which you were not previously registered.  

For the contingent or associate member states, this is the date you expect to have a sale in that state and will start collecting tax for that state.  

This date cannot be more than 60 days in the future.