---
title: "What is Power unit?"
description: "A self-propelled vehicle such as a truck or tractor, as counted on the MCS-150."
canonical: https://mydotcheck.com/glossary/power-unit
last_updated: 2026-10-20
---

# What is Power unit?

A self-propelled vehicle such as a truck or tractor, as counted on the MCS-150.

Power units are the trucks and tractors a carrier operates, owned or leased. Trailers are not power units.

The number of power units is reported on the MCS-150 and used, for example, to set the UCR fee bracket.

## Learn more

-   [MCS-150 Update: Due Date, How to File, and Penalties (2026)](/mcs-150-update)
-   [UCR Registration 2027: Who Needs It, Deadlines and Fees](/ucr-registration)

Check your DOT number

---
Canonical URL: https://mydotcheck.com/glossary/power-unit
Title: What is Power unit?