MCS-150 form: a section-by-section walkthrough

The MCS-150 form looks like a lot, but it asks the same ten or so questions every time. If you have your numbers to hand, the update takes about fifteen minutes. If you have to hunt for them, it takes an afternoon. This walkthrough lists the sections in the order you meet them, what to have ready, and the places where answers go wrong. It is written for the biennial update filed online in Motus.

The rule lets you file electronically, which is how almost everyone does it now:

The form may be filed electronically according to the instructions at the Agency's website.

Before you open the MCS-150 form

Screen names in Motus do not match the old paper form one for one, so we describe what each part asks for, not every button. A few minutes of preparation saves the most time.

You will need:

• Your USDOT number and legal business name
• Physical and mailing addresses, a phone number and an email you actually read
• The number of power units you operate, and how many are owned or leased
• The number of drivers, split by the kind of driving they do
• Total miles run by the fleet in the last full year
• A list of what you haul, including hazardous materials if any

The steps

1. Sign in. Go to Motus and use Login.gov. A company official has to claim the company account the first time. After that they can connect a service provider to act on it.
2. Choose the reason. Pick the biennial update. If you are reactivating a number or correcting a record, the reason is different, and so is what follows.
3. Check your identity. Confirm the legal name, the trading name, the addresses and the contact details. Fix anything that has changed. This is the part people skim, and the part brokers read.
4. Set your operation. Say whether you work in interstate or intrastate commerce, and whether you are for hire or private. This drives which rules apply to you.
5. Tick your cargo. Choose what you actually haul. If you carry hazardous materials, say so, and be ready for extra questions.
6. Count your vehicles. Enter power units, and how many you own, lease for a term or lease for a trip. Do not include trailers.
7. Count your drivers. Enter them by type of driving. A driver who runs interstate belongs in the interstate figure, even if most of the miles are local.
8. Enter your mileage. Give the total miles for the year the form asks about.
9. Certify and submit. A company official signs to say it is correct. Then submit.
10. Save the confirmation. Download or print the receipt, and put it somewhere the whole office can find.

The sections of the MCS-150 form that trip people up

What documents do I need for an MCS-150 update?

We know of no uploads required for a standard update, so confirm that in Motus. But gather three records to read from: your last UCR receipt or fleet list, your fuel tax or ELD mileage summary, and your driver roster. They answer the three questions that cause most delays.

How do I fill out the MCS-150 form if nothing changed?

You still step through each section and confirm it. A form you leave untouched is not an update. The point of the exercise is that a company official has looked at it and said it is right.

Why the vehicle count matters beyond FMCSA

The number of power units you enter here is read by the UCR Plan's Auto-Renew. A made-up example: Pennine Freight has 20 trucks on its form but sold five last winter. Its UCR renewal goes through at 20, which is B3 at $333. At 15 it would be the same bracket, so the mistake costs nothing. But with 21 on the form and 18 in the yard, it pays $1,163 instead of $333. Our UCR filing mistakes list covers the knock-on.

When is it due?

Check your month and year before you start. The method is in our guide to finding your MCS-150 due date, and the full background is in the deep dive on the biennial update. The MCS-150 guide has a lookup that does the sum for you.

After you submit

FMCSA updates its public record. Allow a short while, then run your number through the free check and look at the "last update" date. If it has not changed after a few days, go back into Motus and look for a status message. And keep in mind that FMCSA has paused deactivation for missed updates due on or after 1 June 2026, which is a reason for calm, not for delay.

Tips for getting the numbers right

Power units. If you lease trucks to or from another carrier, check who reports them. A unit should not appear on two records at once.

Drivers. Owner-operators who drive under your authority count. So do part-time and seasonal drivers who ran in the period.

Mileage. Use fuel tax filings or ELD summaries, not memory. Two sources that agree are better than one that feels right.

Email. Put a shared inbox on the form rather than one person's address. When that person leaves, the record keeps working.

If you get stuck

Motus is new, and carriers have reported problems signing in, finding their company and seeing filed changes. If you cannot find your company, check you signed in as a company official, then re-run the claim steps. If the record looks wrong after filing, wait a day, then check again. Our news post on Motus lists the common snags.

After you file

1. Save the confirmation in your records.
2. Tell your insurer if the fleet figures changed.
3. Check your UCR bracket against the new count.
4. Put the next due date in your calendar, two years out.

Four small jobs, ten minutes. They turn a one-off filing into a routine you do not have to remember.