With respect to numismatics, it is usually true that what you earn depends on what you learn. However, many local municipalities and boroughs have a local sales tax, which applies to coin and precious metals bullion purchases. However, the Washington Coin & Bullion Association (https://washingtoncoinandbullionassoc.org/) is already hard at work lining up support to try again in 2027. For details on the nature of exemptions for particular states, contact the National Coin & Bullion Association at https://www.ncbassoc.org/. Note: I serve the National Coin & Bullion Association as its Industry Issues Advisor, where I mostly focus on sales and use tax exemption issues.