COST Membership

COST Calendar

Use our COST Calendar to find events in your area!

2014 COST Programs Calendar

All of COST's 2014 National Programs are confirmed. Check out the dates and locations.

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.