In the state of Washington, there is generally no sales tax on precious metal bullion and monetized bullion (coins used as currency). This exemption applies even if the bullion is sold for more than its face value. However, there are some exceptions and nuances to this rule:

Taxable Products in Washington

• Sales for Manufacturing. If the precious metal bullion is sold to be used in manufacturing items like jewelry or artwork, it may be subject to wholesaling or retailing Business and Occupation (B&O) tax, depending on the nature of the sale. Sales subject to retailing B&O tax are also subject to retail sales tax.
• Non-Monetized Coins. Sales of coins that are not used as currency (i.e., collector's items) are subject to retailing B&O tax and retail sales tax.
• Commissions. Commissions earned from the sale of precious metals are subject to service and other activities B&O tax.
• Other Taxable Items. Some retailers may sell items alongside precious metals that are subject to sales tax, such as numismatic paper currency, accessory items, or processed items.