When you order on ottofrei.com, we collect sales tax on orders shipping to these 23 states:
Arizona, California, Colorado, Connecticut, Florida, Georgia, Hawaii, Illinois, Maine, Maryland, Massachusetts, Michigan, Minnesota, Nevada, New Jersey, New York, North Carolina, Ohio, Pennsylvania, Texas, Utah, Virginia and Washington.
Orders shipping outside the United States are not charged US sales tax.
Orders placed through Shop, Facebook or Google are taxed in every state. Those sites collect the tax themselves and can't apply a tax exemption.
Have a certificate on file and still see tax? Tools and equipment stay taxable. See Are tools always taxable?