Will I receive a tax ID number for each state?
Answer:   A Streamlined Sales Tax ID (SSTID) is issued when you submit your registration through the SSTRS.  That number is a 9-character ID starting with a "S."  You may use your SSTID for communications with Streamlined and all member states.

Some member states will use the SSTID for filing of returns, others will provide you with a state issued number to use.  Each state should let you know what your reporting requirements are.