Learn more about Certified Service Providers at https://SimpleSalesTax.org

The National Association of Certified Service Providers has been formed to:

  • To promote the advancement of automated sales tax collection and administration;
  • To promote the use of Certified Service Providers, certified by the States;
  • To educate the public and the retail industry about the role and benefits provided by Certified Service Providers;
  • To facilitate training, education, and research in computerized multistate sales tax compliance; and
  • To assist the States in maintaining and enforcing appropriate standards for Certified Service Providers and in obtaining and enforcing appropriate certification marks.


Read the Brief of the NACSP & SIIA as Amici Curiae in support of neither party.
Submitted to the U.S. Supreme Court case 17-494, South Dakota v. Wayfair, Inc., et al., March 1, 2018.