I'm wondering this as well, lmao
Edit: Found the answer on
CAG (scroll down the OP):
Charge Sales Tax on Credit Purchases: Alabama, Arkansas, California, Connecticut, Hawaii, Maine, Maryland, Massachusetts, Michigan, Mississippi, Nevada, North Carolina, Ohio, Oklahoma, Pennsylvania, Rhode Island, South Dakota, Tennessee, Utah, West Virginia
Does Not Charge Sales Tax on Credit Purchases: Alaska, Arizona, Colorado, Delaware, Georgia, Idaho, Illinois, Indiana, Iowa, Kansas, Kentucky, Louisiana, Minnesota, Missouri, Montana, Nebraska, New Hampshire, New Jersey, New Mexico, New York, North Dakota, Oregon, South Carolina, Texas, Vermont, Virginia, Washington, Wisconsin, Wyoming