A clear reference for
DOT & FMCSA compliance

What it is

A USDOT number is a unique identifier issued by the U.S. Department of Transportation. It's used by federal and state agencies to track a carrier's safety record, compliance, and inspections.

Who needs it

Any commercial vehicle operator involved in interstate commerce hauling cargo or passengers, and most intrastate carriers in states that require it. Generally required for vehicles over 10,000 lbs GVWR, vehicles transporting hazardous materials, or vehicles designed to carry 8+ passengers for compensation.

Why it matters

Your DOT number is how the government identifies your business. It ties your inspections, crashes, and compliance reviews together. Operating without one when required can result in fines and being shut down.

What it is

An MC number is the operating authority granted by the FMCSA that allows a carrier to transport goods or passengers for hire across state lines. There are different types (common, contract, broker) depending on what you do.

Who needs it

Any for-hire carrier moving freight or passengers across state lines. If you're paid to haul someone else's cargo interstate, you generally need operating authority in addition to your DOT number.

Why it matters

Without active MC authority you cannot legally operate as an interstate for-hire carrier. Your authority must remain active — if it's revoked for any reason, you must stop operating until it's reinstated.

What it is

The BOC-3 form designates a process agent in every state where you operate. A process agent is a person or company authorized to accept legal documents (like court summons) on your behalf.

Who needs it

Every interstate carrier with active MC authority must have a BOC-3 on file with the FMCSA before they can begin operating.

Why it matters

If you're sued or served legal papers in a state where you operate but don't live, the process agent accepts those documents so you're properly notified. No BOC-3 means no operating authority.

What it is

UCR is an annual registration program where interstate carriers pay a fee based on fleet size. The funds support state motor carrier safety and enforcement programs.

Who needs it

Most interstate carriers operating commercial vehicles in interstate commerce. The fee tier is based on the number of vehicles in your fleet.

Why it matters

UCR must be renewed every year. Letting it lapse can lead to fines and being flagged as non-compliant in the national database.

What it is

IFTA is an agreement among U.S. states and Canadian provinces that lets carriers report fuel use across jurisdictions on a single quarterly return, instead of filing separately in every state they drive through.

Who needs it

Carriers operating qualified motor vehicles (over 26,000 lbs or with 3+ axles) in two or more jurisdictions. You need an IFTA license and decals on your vehicle.

Why it matters

IFTA redistributes fuel taxes to the states where you actually drive. Filing late or failing to file can result in penalties and suspension of your IFTA license.

What it is

Form 2290 is the federal Heavy Highway Vehicle Use Tax return. It's an annual excise tax on heavy vehicles using public highways.

Who needs it

Anyone operating a vehicle with a taxable gross weight of 55,000 pounds or more on public highways. Proof of payment (a stamped Schedule 1) is often required to register or renew plates.

Why it matters

You must file and pay annually. The stamped Schedule 1 is your proof of payment — many states and IRP offices require it before they'll issue or renew your registration.

What it is

The MCS-150 is the form used to register and update your DOT number information. Every carrier must update it every two years (the biennial update) — even if nothing has changed.

Who needs it

All carriers with an active DOT number. Your update deadline is based on the last digit of your DOT number.

Why it matters

Missing your biennial update can cause your DOT number to be deactivated. An inactive DOT number means you can't legally operate and may be flagged during inspections.

What it is

New motor carriers go through an 18-month new entrant period. During this time, the FMCSA conducts a safety audit to verify you understand and follow the safety regulations.

Who needs it

Every new interstate carrier. The audit typically happens within the first 12 months of operation.

Why it matters

Failing the safety audit can result in your operating authority being revoked. You must pass it to keep your authority active beyond the new entrant period.

What it is

A DQ file is a record for each driver that proves they're qualified to operate a commercial vehicle. It includes their application, driving record, medical certificate, and road test.

Who needs it

Any carrier employing drivers of commercial motor vehicles (generally vehicles over 10,000 lbs GVWR used in commerce). One file per driver.

Why it matters

DQ files are one of the most common things reviewed during a DOT audit. Missing or incomplete files are a leading cause of fines and failed audits.

What it is

A federally mandated program that requires pre-employment, random, post-accident, reasonable suspicion, return-to-duty, and follow-up drug and alcohol testing for safety-sensitive drivers.

Who needs it

Carriers with drivers operating commercial motor vehicles in interstate commerce. You must also have a designated company official and a testing consortium.

Why it matters

Operating without a compliant drug & alcohol program is a serious violation. It can lead to immediate out-of-service orders and loss of authority.

What it is

The Clearinghouse is a secure online database the FMCSA uses to track drug and alcohol program violations for commercial drivers. Employers must query it before hiring and annually for each driver.

Who needs it

All employers of CDL drivers, and the drivers themselves. Owner-operators must designate a consortium to manage their queries.

Why it matters

You're required to run pre-employment and annual queries on every driver. Missing a required query is a violation that can result in fines.

What it is

Motus is the FMCSA's new online portal replacing the old FMCSA Portal. Carriers now use Motus (with a Login.gov identity) to manage their DOT registrations, MCS-150 updates, and authority.

Who needs it

All carriers with a DOT number. The old portal shut down — you must migrate your account to Motus to continue managing your registrations online.

Why it matters

If you haven't migrated, you may be unable to file updates electronically and risk missing deadlines. Setting up Login.gov identity verification is required to access Motus.

What it is

An Employer Identification Number (EIN) is a federal tax number issued by the IRS to identify a business. It's like a Social Security number for your company.

Who needs it

Any business that will have employees, operate as a corporation or partnership, or needs to file certain federal tax returns. Most carriers need one to apply for authority and open a business bank account.

Why it matters

You'll need an EIN for most filings, applications, and to do business as an entity. It's a foundational piece of starting a carrier operation.

What it is

The International Registration Plan lets you register a commercial vehicle in your base state and legally operate in all other IRP jurisdictions. You pay registration fees based on the miles you run in each state.

Who needs it

Carriers operating interstate with vehicles over 26,000 lbs or with 3+ axles. You receive apportioned plates (often called 'prorated' or 'apportioned' plates).

Why it matters

Without proper apportioned registration, you can't legally travel across state lines with a heavy vehicle. Fees are based on reported miles per jurisdiction.

What it is

Federal rules that limit how long a commercial driver can drive and be on duty before they must rest. They're designed to prevent fatigue-related crashes.

Who needs it

All drivers of commercial motor vehicles in interstate commerce. Most carriers must use Electronic Logging Devices (ELDs) to record hours.

Why it matters

Violating HOS rules is a common cause of out-of-service orders and fines. Keeping accurate logs protects your drivers and your safety record.