Why there is no single answer
There is no national license for mechanics. Requirements come from several layers: federal, state, county and city. The U.S. Small Business Administration notes that most businesses need a combination of licenses and permits from federal and state agencies, and that the requirements and fees vary based on your business activities, location and government rules. This guide explains what to check at each layer. It does not list every state's rules, because they change and differ in detail. Always confirm with the agencies where you operate.
Federal layer
Employer Identification Number
Most businesses with employees, and many others, need an Employer Identification Number from the IRS. The IRS issues EINs free of charge. Watch for websites that charge a fee to apply on your behalf.
USDOT registration
If you operate commercial motor vehicles in interstate commerce, 49 CFR 390.201 generally requires registration with FMCSA and a USDOT number. A heavy service truck can meet the commercial motor vehicle definition in 49 CFR 390.5, which includes vehicles with a gross vehicle weight rating or actual weight of 10,001 pounds or more used in interstate commerce. See how to set up a mobile service truck.
Commercial driver's licenses
Drivers of heavier vehicles need a CDL. Under 49 CFR 383.5, Group B covers a single vehicle with a GVWR of 26,001 pounds or more, among other definitions. States issue CDLs under federal standards. See CDL.
Inspector qualifications
Federal rules do not license mechanics, but they set qualifications for certain work on commercial motor vehicles:
- Annual inspectors. Under 49 CFR 396.19, the motor carrier must ensure that the individual performing a periodic inspection is qualified, through training, experience or a combination, and must keep evidence of the qualification. See qualified inspector.
- Brake inspectors. Under 49 CFR 396.25, the motor carrier must ensure that employees who inspect, maintain, service or repair brakes meet the qualification requirements, and must keep evidence of the qualification. See brake inspector.
Fleets will often ask for proof of these qualifications before they let you inspect or repair their trucks.
Federal contracts
If you want to bid on federal fleet work, you need a SAM.gov registration. SAM.gov states that registration is free. See how to win fleet maintenance contracts.
State layer
Things to check with your state:
- Business formation and registration with the secretary of state or equivalent, if you form an LLC or corporation, and registration of any business name you use.
- Sales tax permit. Many states tax parts, and some tax certain repair labor. Check with your state revenue department.
- Employer registrations for unemployment insurance and state income tax withholding if you have employees.
- Workers' compensation. The SBA notes that businesses with employees must carry workers' compensation insurance, with rules that vary by state.
- Auto repair dealer rules. Some states regulate businesses that repair vehicles for compensation. California's Bureau of Automotive Repair, for example, publishes Write It Right requirements that require a written estimate, recorded authorization before work begins, and itemized invoices. Check whether your state has similar rules and whether they apply to heavy trucks.
- Environmental permits for handling used oil, coolant, filters and other waste.
- Vehicle registration and state carrier rules for your service trucks, which may apply even for travel within one state.
County and city layer
Local requirements often include:
- Business license or business tax registration.
- Zoning for a shop or for parking service trucks at a home base.
- Home occupation permits if you run the business from home.
- Rules on working at customer sites, such as restrictions on repair work in public streets or certain zones.
- Fire department permits for storing flammable materials.
Requirements can differ between neighboring cities, so check each city where you regularly work, not just your home base.
Certifications that are not licenses
Many technicians hold voluntary certifications from industry organizations or manufacturers. These are not government licenses, but fleets often value them as proof of skill. List them on your proposals and keep copies on file.
How to research your requirements
- Start with the SBA. Its guide to licenses and permits explains the federal, state and local layers and links to state resources.
- Visit your state's business portal. Many states offer a single site for business registration and licensing.
- Call your city or county clerk or business licensing office.
- Ask your state revenue department about sales tax on parts and labor.
- Ask your insurance agent what licenses insurers expect.
- Ask fleet customers what proof of qualification and licensing they require.
- Write down what you find, with dates, and set reminders for renewals.
Keeping licenses current
Many licenses and registrations expire. SAM.gov registrations, for example, must be renewed every 365 days. Keep a list of each license, the issuing agency, the expiration date and the renewal steps, and review it monthly.
Working across state lines
If you serve customers in more than one state, check requirements in each. A business registered in one state may need to register as a foreign entity in another state where it does business, and may need local licenses in the cities it serves there. Interstate travel with a commercial motor vehicle also brings federal motor carrier rules into play.
Common mistakes
- Assuming a mechanic needs no license at all.
- Checking only the home city, not the cities where work is done.
- Forgetting sales tax registration for parts.
- Running a heavy service truck without checking USDOT and CDL requirements.
- No written proof of inspector qualifications.
- Letting a registration lapse.
Questions to ask each agency
When you call or email a licensing office, ask specific questions and write down the answers with the date and the name of the person you spoke to:
- Does my business activity, mobile repair of trucks and equipment for compensation, need a license or registration from your office?
- Does it matter whether I work at customer sites, at a shop, or both?
- What are the fees, and how often must I renew?
- Do I need a separate permit to store oil, fuel or other flammable materials?
- Are there rules on parking service trucks or working from my home?
- Is there anything else I should check with another agency?
Specific questions get specific answers. A vague question such as "do mechanics need a license?" often gets a vague reply.
What fleets usually ask for
Fleet customers often ask for proof before onboarding a vendor: a certificate of insurance, a business license, a tax form for their payables team, proof of inspector qualifications for annual inspections and brake work, and sometimes references. Keep a folder with current copies of each so you can send them the same day.
Records that show you are compliant
Keep copies of every license, permit and registration, plus qualification records for each technician who performs inspections or brake work. Fleets and auditors may ask for them, and organized records make renewals and customer onboarding much easier.
How MetaFleet helps
MetaFleet supports work orders and estimates that record customer authorization before work begins, and digital inspections built from your own form, which help with documentation rules such as those in California. Get a walkthrough.