Formed in one state, operating in another: must you register?

I formed an LLC elsewhere but work from home here. Must I register it?

An LLC formed in one state may need authority to do business in the state where you actually run it. The state of formation does not replace registration in another state where the LLC's own activity meets the local test. If you manage and perform the LLC's ordinary work from a home office, treat the home state as a serious registration question, even if every customer is elsewhere. Texas says an office or employee in the state generally points to transacting business; California looks for repeated local business transactions; New York examines the nature and continuity of local activity (Texas Secretary of State; California Secretary of State; New York Department of State).

The work matters more than the owner's mailing address. Record where management, services, employees, inventory, and fulfillment actually occur. A registered agent's address in the formation state is not evidence that the business operates there. If you have not formed a company yet, compare formation choices in Which state should you form in?.

What does a state mean by doing business for registration?

Doing business for company registration means enough local business activity to require an out-of-state entity to get authority from that state's filing office. There is no single nationwide test. Texas says its statute does not specifically define “transacting business” and lists activities that do not count. California's LLC rule focuses on repeated and successive transactions in the state, apart from interstate or foreign commerce. New York says its qualification question turns on local, regular activity and how central that activity is to the company's business (Texas Secretary of State; California Corporations Code; New York Department of State).

Do not use a tax notice or sales tax permit as a shortcut to the answer. New York expressly distinguishes qualification from tax nexus, and California says its LLC registration test does not decide tax or other regulatory duties (New York Department of State; California Corporations Code). State income or franchise tax filings have their own test, as do sales tax permits.

Do customers, occasional work, an employee, or a warehouse trigger registration?

Customers in a state do not, by themselves, answer whether the company must register there. An employee or office is a stronger sign of local operations; occasional work and warehouse inventory need the state's rule applied to the actual activity (Texas Secretary of State; California Corporations Code).

For a Canadian seller, warehouse inventory can also change US tax duties; see Canadian sellers with US inventory.

Does the same test apply to a corporation or a Canadian company?

An out-of-state corporation and a corporation formed in Canada can also need authority before carrying on the activity that triggers a state's registration law. The filing is for the existing entity, with a corporation form rather than an LLC form. Texas expressly includes non-US corporations and LLCs that transact business there; California's foreign entity rules cover companies formed out of state or out of country; New York uses “foreign” for organizations formed in another state or another country (Texas Secretary of State; California Secretary of State; New York Department of State).

A sole proprietor has no separate LLC or corporation to qualify. A general partnership, limited partnership, or limited liability partnership may face a different filing category, so identify the entity's legal form before choosing an application. Texas, for example, separately addresses foreign limited partnerships and limited liability partnerships (Texas Secretary of State). Federal and cross-border tax questions for a Canadian corporation require a separate review.

How do I apply for authority, and what records or agent do I need?

Apply for authority or foreign registration with the filing office of each state where the company's activities require it. Confirm the legal name and good standing in the formation jurisdiction, then check whether that name is available in the new state. If it conflicts, an alternate or assumed name may be required; using an assumed name in Texas also requires a separate assumed-name certificate. Use the destination state's form for the entity type and provide its required contact for legal papers. Texas and California require an agent; New York designates its Secretary of State for foreign LLCs and requires a forwarding address (New York application; Texas Form 304 instructions; California Secretary of State).

After New York authorizes a foreign LLC, it generally must publish once a week for six weeks in designated newspapers and file a Certificate of Publication within 120 days. The certificate fee is $50. Missing the deadline suspends authority, which a later compliant filing restores; qualifying theatrical production LLCs are exempt (New York Department of State; New York LLC Law § 802). An LLC formed outside the US that applies for New York authority must file a state beneficial ownership disclosure or exemption attestation within 30 days of the application; one authorized before 2026 has until December 31, 2026, and annual filings follow. Each filing costs $25. After a filing is more than 30 days late, the attorney general may assess up to $500 per day; clearing past-due status requires the current filing, a $250 fine, and payment of any attorney-general penalty. Failure to file after at least 30 days' suspension notice bars business until filing; more than two years late, the company is delinquent and may face annulment of authority (New York LLC Law § 1108; New York Department of State). California LLCs must file an initial Statement of Information within 90 days of registration and every two years thereafter; qualified out-of-state corporations file within 90 days and yearly (California LLC statement instructions; California Franchise Tax Board). After a delinquency notice, California allows 60 days to file before referring the case for a $250 penalty. The entity can request a waiver for reasonable cause or unusual circumstances after filing the current statement (California Secretary of State; California Franchise Tax Board). Check each state's current filing instructions before submitting.

I operated without registering. What could follow?

Late registration can bring filing fees, penalties, and a temporary limit on using the state's courts. It does not erase the earlier operating period. Texas requires registration to transact business there. Its 90-day period only avoids a late filing fee; after that, the late fee counts each whole or partial calendar year since the entity first transacted business. An unregistered entity cannot maintain a Texas court action arising from its local business until it registers. Texas can also seek a civil penalty equal to the fees and taxes that would have been due, plus related penalties and interest (Texas Business Organizations Code §§ 9.051–9.054; Texas Secretary of State).

In New York, an unqualified foreign LLC cannot maintain a court action until it obtains authority. A foreign corporation must also pay accrued state fees, taxes, penalties, and interest before maintaining an action (New York LLC Law § 808; New York Business Corporation Law § 1312). A California foreign LLC likewise cannot maintain an action without registration (California Corporations Code § 17708.07). In California, a foreign corporation that willfully transacts unauthorized intrastate business can face $20 per day; to maintain a covered court action, it must qualify and pay a separate $250 penalty and overdue taxes (California Corporations Code § 2203). These are state and entity examples. The first date activity crossed the state's test matters; formation date alone does not start a late-registration clock. Separately review any state income or franchise returns that may be due.

The entity owes its own registration fees and penalties. Failure to register alone does not make a New York or California foreign LLC's members or managers liable for its debts, or a Texas foreign filing entity's owners or managers liable (New York LLC Law § 808; California Corporations Code § 17708.07; Texas Business Organizations Code § 9.051). Texas excludes foreign limited partnership general partners from that protection: they can owe partnership obligations incurred while they were partners. After withdrawal, liability for a later debt depends on whether the creditor reasonably believed they remained a general partner when the debt arose; notice of withdrawal or newspaper publication can end that belief (Texas Business Organizations Code § 152.304; §§ 153.152 and 153.161). A sole proprietor owes business obligations directly. Separate tax or guarantee rules can create personal liability.

A state sent a registration letter. What should I check before replying?

Check the letter against the company's actual activity and the sender's official filing office before agreeing that registration was required from a stated date. A tax notice, customer address, or permit may identify a state connection without establishing the entity-registration test (New York Department of State; Texas Secretary of State).

Gather the formation certificate and current good-standing record; the first and last dates of local work; home-office and employee locations; contracts and where they were accepted or performed; warehouse agreements and inventory locations; earlier state registrations, tax returns, permits, and notices. Make a timeline by state. Compare that timeline with the specific state's test and the letter's requested response date. If the required registration date is disputed or unclear, ask an attorney familiar with that state's law to assess the activity before stating a start date (Texas Form 304 instructions; California Secretary of State). Use business formation help to organize records, filings, and related tax questions.

Should I register the existing company or form a new home-state company?

If the same company continues operating, foreign registration is the direct way to seek authority for that existing entity. Forming a second company creates a separate legal entity; it does not, by itself, settle whether the first company needed authority for its past or continuing activity. Texas distinguishes an application for registration from a name registration, which does not give authority to transact business (Texas Secretary of State).

Compare the entities before changing course: which one signed customer contracts, employs workers, owns inventory and assets, holds permits, and has outstanding filings? If you want to change the company's legal home rather than keep it and qualify elsewhere, see Moving your company to another state. The result depends on the states' conversion rules and the company's existing obligations.

Example

Illustrative only. All amounts are US dollars. A Wyoming LLC's owner began doing the company's ordinary work from a Texas home office on October 1, 2025. The LLC applies for Texas registration on September 29, 2026. If that work was transacting business from October 1, it is beyond Texas's 90-day late-fee period. Texas counts parts of both calendar years: two years × $750 gives a $1,500 late filing fee, plus the $750 application fee, for $2,250 in filing fees (Texas Secretary of State; Texas Form 304 instructions). The actual start date and any other liabilities need review. If the LLC also stores goods in California, that warehouse needs its own registration review; customer sales alone do not decide it (California Corporations Code). Review tax filings separately.

Different for you?

• You are still choosing where to form: compare the states in Which state should you form in?.
• Your state asks for income or franchise returns: use Business income tax in other states.
• California asks about its annual LLC tax or fee: see California minimum tax and LLC fee.
• You need a sales tax permit or resale certificate: see When you must collect sales tax.
• You are moving the existing company's legal home: see Moving your company to another state.
• A Canadian company has US warehouse inventory: see Canadian sellers with US inventory.
• You have a late notice, workers, inventory, or activity in several states: bring your activity timeline, formation and good-standing records, contracts, notices, and prior filings for business formation help.