What is the sales tax rate in Casper?
The combined sales tax rate in Casper, Wyoming is 5% as of 2026. It is made up of the Wyoming statewide base rate of 4%, plus applicable Natrona County and local district taxes. Casper sits within Natrona County, and the rate can vary slightly across ZIP codes because of special district additions (see the ZIP breakdown below).
Sales tax in Wyoming is administered by the Wyoming Department of Revenue, which collects and distributes tax on behalf of the state and its local jurisdictions. The rate applies to most retail sales of tangible personal property delivered within Casper.
Who needs to collect sales tax in Casper, Wyoming?
Any business with sales tax nexus in Wyoming must register, collect, and remit sales tax on taxable sales delivered to Casper. Nexus is established through:
- Physical presence: an office, store, warehouse, employee, or inventory located in Wyoming.
- Economic nexus: exceeding $100,000 in sales to Wyoming customers in the current or prior year.
- Marketplace facilitators: platforms such as Amazon or Etsy collect and remit on behalf of their third-party sellers.
Out-of-state (remote) sellers that cross Wyoming's economic nexus threshold must register with the Wyoming Department of Revenue before continuing to sell into the state.
How do you register for a sales tax permit in Casper?
To collect sales tax in Casper, you must register for a sales tax permit with the Wyoming Department of Revenue. Registration is generally free. You will typically need your EIN or SSN, business entity details, bank account information, and an estimate of your monthly Wyoming sales. Most permits are issued within a few business days of an online application.
How do you charge the right sales tax in Casper?
Sales tax in Casper is charged based on the delivery address. For orders shipped to a Casper address, the combined rate of 5% generally applies; for in-store sales, the rate is based on the store's location. Because some ZIP codes within Natrona County carry additional special-district taxes, always confirm the exact rate for the specific delivery ZIP code. The tables below show the most common Casper ZIP codes and how Casper compares with other cities in Natrona County and across Wyoming.
