Wisconsin trailer registration fees run from $15 a year for a recreational vehicle trailer to more than $2,500 for the heaviest commercial trailers. The Wisconsin Department of Transportation (WisDOT) sets the fee from two things: the trailer’s gross weight (the trailer plus its maximum load) and how it’s used. Farm and specialty trailers pay roughly half the standard rate, and RV trailers pay a flat $15 regardless of size.
Standard Trailer Fees by Weight
Standard trailers are priced on a graduated scale tied to gross vehicle weight. The annual fees below apply to registrations on or after October 1, 2025:
- Up to 4,500 lbs: $50.00
- Up to 6,000 lbs: $50.00
- Up to 8,000 lbs: $58.30
- Up to 10,000 lbs: $85.25
- Up to 12,000 lbs: $114.95
- Up to 16,000 lbs: $311.30
- Up to 20,000 lbs: $391.60
- Up to 32,000 lbs: $669.90
- Up to 50,000 lbs: $1,169.30
- Up to 68,000 lbs: $1,543.00
- Up to 80,000 lbs: $2,560.00
Gross weight is the trailer plus its maximum load, not the empty trailer. A flatbed that weighs 5,000 pounds empty but hauls 7,000 pounds of cargo has a gross weight of 12,000 pounds and owes $114.95 a year.1State of Wisconsin Department of Transportation. Fee Schedule Pick the bracket that matches what your trailer can carry when loaded, not what it weighs sitting in the driveway.
Farm and Specialty Trailer Fees
Farm trailers, dairy trailers, raw forest products trailers, and trailers carrying the special “Z” designation pay roughly half the standard rate at every weight bracket:
- Up to 6,000 lbs: $25.00
- Up to 8,000 lbs: $29.15
- Up to 10,000 lbs: $42.63
- Up to 20,000 lbs: $97.90
- Up to 50,000 lbs: $292.33
- Up to 80,000 lbs: $704.00
The savings add up fast on heavy equipment. A farm trailer rated at 50,000 pounds gross weight pays nearly $877 less per year than a standard commercial trailer at the same weight.1State of Wisconsin Department of Transportation. Fee Schedule
Agricultural commercial motor vehicles traveling for delivery, service, or repair within a 75-mile radius of the farm or business are also exempt from gross vehicle weight and axle weight limits, which can push your trailer into a different (and cheaper) bracket than it would otherwise fall under.2Wisconsin Department of Transportation. Agricultural Commercial Motor Vehicles (Ag CMVs)
Recreational Vehicle Trailer Fee
Campers, travel trailers, and other RV trailers use their own schedule. The annual registration fee is $15, flat, no matter the trailer’s weight.1State of Wisconsin Department of Transportation. Fee Schedule That’s the lowest trailer fee WisDOT charges.
Expiration Dates and First-Year Proration
Trailer registrations don’t all expire at the same time. The expiration always lands at the end of the assigned month:
- Standard trailers and heavy trucks/tractors: December
- Farm trailers: February
- Recreational vehicle trailers: April
When you first register a trailer, WisDOT prorates the annual fee so you only pay for the months remaining until your next expiration date.3Wisconsin Department of Transportation. Vehicle Registration If you register a standard trailer in July, you pay for July through December, not a full twelve months.
Short-Term Options for Heavy Trailers
Heavy trailers can register on consecutive monthly or quarterly periods instead of annually. For trailers that only work part of the year, that avoids paying for months the trailer sits idle.3Wisconsin Department of Transportation. Vehicle Registration A seasonal hauler can be cheaper to run this way than paying the full $1,169.30 or $2,560.00 annual fee at the top brackets.
What It Costs to Skip Registration
Towing an unregistered trailer on public roads is a forfeiture offense. The maximum penalty depends on the trailer’s gross vehicle weight rating:
- GVWR of 10,000 pounds or less: forfeiture up to $200
- GVWR over 10,000 pounds: forfeiture up to $500
On top of the fine, the court orders you to apply for registration and pay the fee anyway. If you don’t finish that registration within 45 days of conviction, WisDOT itself will order you to do so.4Wisconsin State Legislature. Wisconsin Code 341.04
The bigger exposure is insurance. Most policies condition coverage on the vehicle being registered and legally operable. An accident while towing an unregistered trailer can trigger a denial on bodily injury, property damage, and collision claims, which leaves you personally on the hook.
Exemptions and Reduced Fees
Wisconsin exempts some trailers from standard fees. Government-owned trailers used for official purposes like road maintenance and emergency response don’t owe registration fees. Farm trailers used exclusively for agricultural products, supplies, or equipment may qualify for the reduced farm rate above, and sometimes for broader exemptions when the trailer stays within a limited radius of the farm and isn’t regularly operated on public highways.
Some nonprofits may also qualify for reduced fees or full exemptions subject to WisDOT approval. Confirm with WisDOT before relying on an exemption; operating an exempt trailer outside the allowed conditions carries the same penalties as running an unregistered one.
Federal Fees That Stack on Top
If you only haul in-state and your trailer isn’t commercial, the WisDOT fee is the whole bill. Interstate commercial operators owe more on top.
Unified Carrier Registration
Interstate motor carriers, freight brokers, and leasing companies must register annually under the federal Unified Carrier Registration (UCR) program, with a fee based on fleet size. For 2026, a carrier with two or fewer vehicles pays $46. Three to five vehicles pay $138, and the scale runs up to $44,836 for carriers with more than 1,000 vehicles. UCR must be paid before January 1 of the registration year.5Unified Carrier Registration (UCR). Fee Brackets
Heavy Vehicle Use Tax
The federal Heavy Vehicle Use Tax applies to highway vehicles with a taxable gross weight of 55,000 pounds or more. It’s filed annually on IRS Form 2290 for the tax period of July 1 through June 30. Vehicles expected to travel 5,000 miles or fewer during the period (7,500 miles for farm vehicles) still file a return but owe no tax, unless they exceed the mileage limit during the period.6Internal Revenue Service. Key Filing Deadlines for the Heavy Highway Vehicle Use Tax