There is no sales tax in New Hampshire.
http://webster.state.nh.us/government/laws.html
www.state.nh.us/revenue/currentuse/currentuse.htm
www.state.nh.us/revenue/forms/forms.htm
email – sarnold@nhsa.state.nh.us
Tel. – (603) 271-2191
Fax – (603) 271-6121
Mail – New Hampshire Department of Revenue Administration, P.O. Box 457, Concord, NH 03302-0457