FIELD-BY-FIELD GUIDE · UPDATED JULY 2026

MCS-150 instructions: every section, without the guesswork

The MCS-150 is free to fileand takes about 20 minutes in FMCSA's Motus system once you have your numbers together. The catch isn't difficulty — it's that several fields quietly feed other systems: your UCR bracket, your insurance underwriting, your audit profile. Here's every section, what it actually asks, and where careless answers come back to bite.

Before you start: gather these

Your USDOT number and Motus (Login.gov) access — set this up days before a deadline, not the night of. Motus explained.
EIN (not your SSN — see below).
Vehicle counts by type: owned / term-leased / trip-leased.
Driver counts: total, CDL, interstate.
VMT (vehicle miles traveled) and its mileage year — from IFTA or your ELD.
Cargo types you actually carry.

Reason for filing

The form opens by asking why you're filing: biennial update (the every-two-years refresh, required even with zero changes), change of information (address, contact, fleet — due within 30 days of the change), or out of business. Pick one. If your biennial window is open and something also changed, the biennial filing carries the new information — you don't file twice.

Company identity and addresses

Legal name exactly as the IRS knows it (mismatches cause rejections), DBA only if you actually operate under one, and your principal place of business— a physical address, not a PO box. The mailing address can be a box; the principal place can't. If you've moved since your last filing, this is the moment the federal record catches up.

EIN (or SSN)

The tax-ID field accepts an EIN or SSN. Use the EIN — this record is public. The IRS issues EINs free at irs.gov in about 10 minutes; if a filing service ever quotes you a fee for one, that tells you everything about the service.

Item 22 — company operation

Interstate (22a) or intrastate (22b hazmat / 22c non-hazmat). The honest test: do your trucks, your freight, or your loads' journeys cross a state line — even occasionally? One interstate trip makes you interstate. Getting this wrong understates your obligations and surfaces at the worst time (roadside or audit).

Item 23 — operation classification

Authorized for-hire (23a) means you haul other people's freight for pay under operating authority. Exempt for-hire (23b) covers exempt commodities. Private property (23c) means you haul your own goods. This field trips up new filers more than any other, and a wrong classification here is how carriers end up buying authority they don't need — or running without authority they do need. Not sure? The free quiz answers it in five questions.

Item 24 — cargo classifications

Check every cargo type you actually carry from the form's list (general freight, household goods, machinery, refrigerated, and so on — through the "other" box, which requires a description when ticked). Insurers read this. Checking cargo you don't carry raises questions; missing cargo you do carry is worse.

Item 26 — vehicles

Counts by type — straight trucks, truck tractors, trailers — split by how you hold them: owned, term-leased, or trip-leased. Two rules keep this clean: trailers are not power units, and the power-unit total should match reality because your UCR bracket is built on it. Every extra phantom truck costs money.

Drivers and VMT

Total drivers, CDL holders, and your interstate/intrastate split, plus VMT(vehicle miles traveled) with its mileage year. Pull VMT from IFTA returns or your ELD. This is the number auditors compare against your fuel receipts and logs — "about 100,000" guesses age badly.

Item 28 — revocation question

Whether your registration is currently revoked. Answer truthfully — FMCSA already knows. If you're deactivated for a missed biennial, this filing is the fix, and our rush reactivation service exists for exactly that spot.

Certification and signature

The certification must be signed by you (or an officer of the company) — a filing service can prepare every field, but the certification is yours. Any service that signs for you is doing it wrong. When we file, you e-sign; when you DIY in Motus, you certify inside the system.

The five mistakes that follow carriers around

Guessed VMT. Auditors compare it to fuel and logs; insurers price on it.
Wrong operation classification (item 23). The root cause of both useless authority purchases and running-without-authority citations.
Trailers counted as power units (item 26). Inflates your UCR bracket — a real annual cost for a checkbox error.
Skipping the biennial because nothing changed.The filing is required anyway; FMCSA flags your record "out of date" where brokers and insurers see it. Check your deadline free.
Following pre-2026 guides. Anything describing the old FMCSA Portal or URS predates Motus. The filing lives in Motus now — here's the current walkthrough.

File it yourself, free — or hand it off

DIY: file online via FMCSA — Updating Your Registration ($0, always). Or we prepare every field from your federal record, you e-sign, and we verify the record actually updated: $69 flat.

File my MCS-150 — $69 First: check your deadline free

MCS-150 form questions, straight

▸Where do I actually file the MCS-150 in 2026?

Online in FMCSA's Motus system — the old FMCSA Portal registration closed May 14, 2026. The form's own instruction pages also describe mail submission, but online is what FMCSA recommends and the only way to see your record update quickly. Filing is free either way.

▸What is VMT and which year do I report?

Vehicle Miles Traveled — the total miles your vehicles ran in the 12-month period you're reporting, plus the year that mileage belongs to. Pull it from your IFTA returns or ELD rather than guessing: auditors and insurers both see this number, and a wildly wrong VMT is a flag.

▸Do owner-operators put their SSN on the MCS-150?

Use an EIN if you have one — and you should. The form accepts either, but your EIN is semi-public in FMCSA records, and using your SSN there means your SSN is the thing floating around data brokers. EINs are free from the IRS in about 10 minutes.

▸What counts as a power unit?

Trucks and truck tractors you operate — owned, term-leased, or trip-leased. Trailers are listed separately and are NOT power units. This count matters beyond the form: it sets your UCR bracket, so an inflated count costs you real money every year.

▸Do I file if my company shut down?

Yes — one last MCS-150 marking the operation as out of business. It stops the biennial clock and keeps the record clean. Ignoring it instead leaves a zombie registration that causes duplicate-number headaches if you ever come back.