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Sole proprietor to LLCCan you keep your DOT number when you form an LLC or corporation?
Sometimes. FMCSA allows a sole proprietor to keep its number after a change in form of business, but only in a narrow set of facts. Reading that language carefully is the difference between one record and two.
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Rather not deal with this? Hand it to a compliance specialist.
Consult with a Compliance SpecialistThe starting point
FMCSA's guidance on name and form-of-business changes says a USDOT number is assigned to one person and stays assigned to that person. A person includes an individual, corporation, partnership or other business organization authorized by state law.
What FMCSA says it will allow
The same guidance says FMCSA "will allow a sole proprietor to maintain its USDOT number when it changes its current form of business, and the new entity will continue to operate virtually the same (absent the form of business change) as before the change." It adds that there would be no change in company officers, address or other demographic information, and that the new entity will maintain identical operations, employees and assets. FMCSA also says it will permit a change in the tax ID number based on the new articles of incorporation.
That is a narrow allowance. It does not mean everyone who forms an LLC keeps the number automatically.
What usually goes wrong
The owner files a brand-new registration in the LLC's name instead of updating the existing record, and now there are two numbers. See what to do if you applied twice.
If the new company is not a continuation
If the new entity does not fit FMCSA's description, it is a new legal person and generally needs its own number. FMCSA's bulletin on selling USDOT numbers also explains that a sole proprietor's number cannot be used by anyone else. If the sole proprietor is no longer operating, that number should be taken out of use. See deactivating a duplicate and why a number cannot be sold or handed off.
This is general information, not legal advice
If your facts do not clearly match FMCSA's "virtually the same" language, ask FMCSA before filing anything new.
What the change usually involves
That is 5 separate tasks, and each one has its own form, login or record to check.
- Compare your facts to FMCSA's "virtually the same" description.
- If the number stays, update the existing record with Form MCS-150.
- If the new company is a new legal person, get it its own USDOT number.
- If the sole proprietor stops operating, take that number out of use.
- Line up authority, insurance and BOC-3 with the right legal entity.
Rather not deal with this? Hand it to a compliance specialist.
Consult with a Compliance SpecialistRecurring deadline: FMCSA says an updated MCS-150 is due within 30 days of a change in company details (source). For a name change on operating authority, FMCSA says the amended BOC-3 and proof of insurance must be filed within 30 days (source).
Common questions
I was a sole proprietor and formed an LLC. Do I have to get a new USDOT number?
Not automatically. FMCSA describes conditions under which a sole proprietor may keep the number when the new entity continues to operate virtually the same. Compare your facts to FMCSA's wording.
Can I just apply for a new number in the LLC's name to be safe?
That is how duplicate records start. Ask about updating the existing record first.
What if the LLC has new officers, a new address or different assets?
FMCSA's allowance assumes no change in officers, address or other details and identical operations, employees and assets. If those changed, do not assume you can keep the number, and do not run the business under two active numbers either. Ask FMCSA.
Can I keep the sole proprietor number and also get one for the LLC for the same business?
No. Do not operate the same business under two numbers.
Does this apply to operating authority too?
Authority is also tied to the legal person. FMCSA's bulletin says it may require separate authority or record a transfer depending on the transaction. Check with FMCSA rather than assuming.
Still have questions about your record? Ask one of our Personal Compliance Specialists.
Consult with a Compliance SpecialistRelated guides
- Name change or new number?
- Applied for a DOT number twice
- Can you have two DOT numbers?
- Company ownership changes
- You cannot sell a DOT number
You can sort this out yourself. Search the public record, including the SAFER company snapshot, and use FMCSA registration resources or Motus. Or request a record review and we will look at what appears on the public record.
Do it yourself
- Updating your USDOT information with FMCSA is free, according to FMCSA.
- You set up Login.gov and complete identity verification for Motus.
- You find the right forms, versions and supporting documents.
- You match names, numbers and addresses across the record, authority, insurance and BOC-3.
- You track the deadlines and follow up with FMCSA yourself.
Have a specialist handle it
- Our Personal Compliance Specialists review the public record and explain what they see.
- They help prepare the filings and gather the supporting documents.
- They help line up authority, insurance, BOC-3 and UCR with one number.
- Paid service. Government fees, where they apply, are separate.
- You still sign and certify, and FMCSA still decides.
Sources
Public pages checked on November 15, 2026. FMCSA can change its process at any time, so check the current page before you file.