Wyoming vehicle sales tax runs 5% to 6% of the purchase price in most counties: a 4% state rate plus a 1% or 2% county add-on. You pay it yourself at the County Treasurer’s office in the county where you live, not at the dealership, and you have 65 days from the purchase date before penalties start.
What You’ll Actually Pay
The state rate is 4%, built from a 3% base and a 1% surcharge that has been in place since 1993.1Justia. Wyoming Code 39-15-104 – Taxation Rate It applies to every vehicle purchase in Wyoming, whether you buy from a dealer or a private party.
On top of that, counties can add their own local option taxes. Wyoming law allows a general-revenue tax of up to 2%, a specific-purpose tax of up to 2%, and an economic-development tax of up to 1%, with the combined total from those three capped at 3%.2Justia. Wyoming Code 39-15-204 – Taxation Rate Most counties sit at 1% or 2%, which puts the real-world combined rate at 5% or 6%.
A $30,000 vehicle at 5% carries a $1,500 tax bill. The same vehicle in a 6% county costs $1,800. Current county rates are posted by the Wyoming Excise Tax Division.
How Trade-Ins Reduce the Taxable Price
Wyoming excludes the value of a trade-in from the taxable price, so only the cash difference gets taxed.3Justia. Wyoming Code 39-15-105 – Exemptions Buy a $40,000 truck and trade in your old vehicle for $15,000, and tax applies to $25,000. At 5% that saves $750.
The trade-in and the purchase must be part of the same transaction. Selling your old car privately and then buying the new one separately doesn’t qualify.
When and Where to Pay
Payment goes to the County Treasurer in your county of residence, and the tax must be paid before the vehicle can be registered or receive permanent plates.4Park County Treasurer. Vehicle License – Park County Wyoming You have 65 days from the purchase date.
Bring the following:
- Bill of sale or dealer invoice showing the purchase price, date, year, make, and VIN
- The signed title from the seller, or a Manufacturer’s Statement of Origin for a new vehicle
- The lease agreement, if the vehicle is leased
- Trade-in paperwork showing the allowed value, if applicable
If your title is still being processed as the 65-day clock runs down, you can pay the tax first. The County Treasurer will accept a dealer invoice, purchase order, or notarized bill of sale that includes the year, make, VIN, and purchase date.5Natrona County, WY. Sales and Use Tax
Most offices take cash, check, and electronic payments. Credit cards usually work but carry a processor convenience fee around 2.5%. On a large tax bill, that fee adds up fast, so cash or check is cheaper.
Late Penalties
Miss the 65-day deadline and the penalties escalate in two stages.6Justia. Wyoming Code 39-15-108 – Enforcement
- Days 65 through 75: a flat $25 civil fee, plus interest at 1% per month from day 65.
- After day 75: the civil fee becomes $25 or 10% of the tax owed, whichever is greater. Interest keeps running at 1% per month.
On a $2,000 tax bill, paying on day 70 costs $25 plus a small amount of interest. Pay on day 80 and the civil fee alone jumps to $200, plus the accumulated interest. The jump after day 75 is steep enough that it’s worth putting the deadline on a calendar the day you sign the paperwork.
Buying a Vehicle Out of State
If you buy outside Wyoming and bring the vehicle home, you owe use tax rather than sales tax. The rate is the same: 4% state plus local option.7Justia. Wyoming Code 39-16-104 – Taxation Rate If the other state’s dealer already collected sales tax, the County Treasurer will typically credit that amount, and you pay only the difference when Wyoming’s rate is higher.
The 65-day deadline applies here too, counted from the date the vehicle enters Wyoming. You’ll submit an affidavit confirming that date.6Justia. Wyoming Code 39-15-108 – Enforcement
Private Party Sales and Low Reported Prices
On a private sale, tax is based on the purchase price shown on the bill of sale. The Wyoming Department of Revenue can question a price that looks unreasonably low and recalculate the tax using Kelley Blue Book or NADA values instead. If a relative or friend offers a vehicle at a token price, the state may not accept $500 as the sale price of a car with a $12,000 book value.
Exemptions
Family Transfers Starting July 1, 2026
Beginning July 1, 2026, Wyoming exempts vehicle sales and gifts between immediate family members from both sales and use tax. Immediate family includes parents, children, spouses, siblings, stepparents, stepchildren, stepsiblings, grandparents, and grandchildren.8Wyoming Legislature. 2026 SF0061 – Motor Vehicle Transfers to Family One condition: the person giving or selling the vehicle must have already paid sales or use tax on it when they originally acquired it. If they didn’t, the exemption doesn’t apply.
Religious and Charitable Organizations
Vehicles sold to religious or charitable organizations for use in their regular charitable or religious activities are exempt.3Justia. Wyoming Code 39-15-105 – Exemptions This does not cover vehicles bought for resale or for unrelated business operations. The organization provides an exemption certificate to the seller.
Military
Active-duty military stationed in Wyoming do not get a vehicle sales tax exemption. The tax applies in full regardless of military status, though registration fee adjustments may be available separately.