When Carriers Must Use KYU Numbers

Dec. 1, 2025, 2:50 p.m.
A KYU number is a unique tax account issued by the Kentucky Transportation Cabinet for carriers operating commercial motor vehicles in Kentucky. It’s required for tracking and paying the state’s Weight Distance (WDT) tax. If you run a truck through Kentucky, understanding when you must use a KYU number is essential for avoiding fines, audits, and compliance delays.
KYU Online

Who Must Have a KYU Number?

You must register for and use a KYU number if your vehicle meets ALL of the following criteria:

1. Operates in Kentucky (in-state or passing through)

Any trip that enters, exits, or travels inside Kentucky’s borders qualifies.

2. Has a combined licensed weight of 60,000 lbs or more

This includes:

  • The truck

  • The trailer

  • The load

If your GVW or registered weight is 60,000 lbs+, you must have a KYU number.

Examples of Vehicles That Require a KYU Number

Heavy semi-trucks hauling freight
 Oversize/overweight permitted loads
 Heavy dump trucks (depending on registration)
 Logging, coal, or resource haulers above 60,000 lbs
 Out-of-state carriers entering KY with heavy trucks

When You Do Not Need a KYU Number

You are exempt from KYU requirements if:

1. Your vehicle is below 60,000 lbs GVW

Trucks registered at 59,999 lbs or less do NOT need a KYU number.

2. You are a farm-plated vehicle (in most cases)

Kentucky grants exemptions for certain agricultural vehicles, depending on:

  • Type of farm registration

  • Gross weight

  • Distance traveled

3. You only operate intrastate lighter commercial vehicles

Medium-duty trucks (box trucks, lighter hotshot rigs, etc.) below the threshold don’t qualify.

4. You operate under a Kentucky One-Time Temporary KYU Permit

This is for carriers who rarely enter the state and do not want to maintain a permanent KYU account.

Using Your KYU Number

Once your KYU number is active, you must:

  • File quarterly KYU Weight Distance Tax returns

  • Report total miles driven within Kentucky

  • Pay the tax owed (rate per mile)

  • Maintain accurate distance records (preferably ELD backed)

Failing to file, even with zero miles, can lead to:

  • Account suspension

  • Penalties

  • Fines

  • Delays when trying to obtain other permits

Common Scenarios: Do You Need KYU?

Scenario KYU Required? Explanation
A 63,000-lb truck passing through Kentucky Yes Over 60,000 lbs = KYU required
A 58,000-lb hotshot rig No Under the weight threshold
An 80,000-lb truck delivering in Louisville Yes Any entry into KY triggers requirement
A farm vehicle under special exemption Often No Many farm plates exempt
One-time trip with a heavy truck Not required if using temporary KYU permit Temporary option available

Key Takeaway

You must use a KYU number if you operate in Kentucky with a commercial motor vehicle weighing 60,000 lbs or more, whether you are based in the state or simply passing through.