COST Membership

2016 COST Calendar

Start planning now - Check out the dates and locations of COST's 2016 National Programs.

COST Calendar

Use our COST Calendar to find events in your area!

state tax library

The State Tax Library is intended to serve as a thorough state tax resource.  The library includes legislative testimony, regulatory comments, studies, amicus, Practitioner Connection submissions, as well as a listing of significant historical state tax cases.