Louisiana is the only US state that runs on a civil-law system instead of common law, and that single fact changes how courts read an LLC's operating agreement. Everywhere else, judges lean on decades of case precedent to fill gaps in a contract. In Louisiana, they go back to the codified Louisiana Civil Code and ask what the parties actually intended.
That difference sits underneath almost every step below, especially the operating agreement and succession planning. Here's how to form an LLC in Louisiana without getting caught by it.
TL;DR
- Louisiana runs on civil law, not common law: operating-agreement templates written for Delaware or Wyoming may not translate cleanly, and forced heirship plus non-heritable membership interests create real succession wrinkles.
- Step 1, name: reserve your LLC name for 120 days through Form #398 ($25) before you're ready to file.
- Step 2, registered agent: you need a physical Louisiana street address, and if your agent resigns you have 30 days to replace them before the Secretary of State's office becomes your registered office by default.
- Step 3, Articles of Organization: file Form #365 with the Secretary of State's Commercial Division via geauxBIZ; the fee is $100 now but rises to $125 on October 1, 2026.
- Step 4, EIN without an SSN: founders without an SSN or ITIN use Form SS-4 by phone, fax, or mail instead of the online tool.
- Step 5, Form 5472: a 25%+ foreign-owned single-member LLC must file this every year, even at zero revenue, or risk a $25,000 minimum penalty.
- Ongoing compliance: file an Annual Report every year by your formation anniversary, and budget for Louisiana's new flat 3% state income tax rate.
- Common mistakes: using an out-of-state operating agreement template without Louisiana-specific review is the mistake unique to this state.
Why Louisiana's Legal System Is Different
Louisiana is the only US state built on civil law, rooted in the Napoleonic Code and Spanish and French colonial law, rather than the English common law every other state uses. That's not trivia. It changes how a court reads your LLC's operating agreement.
In the other 49 states, contract disputes get resolved partly by looking at how similar cases were decided before. Louisiana courts work differently: they interpret agreements, including LLC operating agreements, by reference to the codified Louisiana Civil Code and the parties' actual intent, not by accumulated case precedent.
In practice, that means an operating agreement drafted with Delaware or Wyoming boilerplate can use terms of art that don't map cleanly onto Louisiana's civil-code concepts. A clause that would hold up fine in a common-law state might read ambiguously, or mean something different, under Louisiana's framework. Louisiana-specific legal review of your operating agreement matters more here than it would almost anywhere else in the country.
Two related quirks make this more than an academic point for founders with a US-resident spouse or co-founder.
Forced Heirship Can Override What Your Will Says
Louisiana retains "forced heirship," a civil-law inheritance concept largely abolished elsewhere in the US. It can compel a decedent's estate to reserve a portion of assets for certain heirs, typically minor or disabled children, regardless of what a will or operating agreement says. This applies to a founder's estate generally, not just LLC interests, but it can shape how ownership passes if a member dies while active in the business.
A Membership Interest Doesn't Automatically Pass to Heirs
Under Louisiana LLC law, a member's death ends their membership itself. Their succession representative becomes only an assignee of the economic interest, not a full voting member, unless the operating agreement specifically says otherwise. Combined with Louisiana's community-property marital regime, this can create real succession-planning complications for a founder who adds a US-resident co-founder or spouse to the LLC, complications founders in common-law states typically don't face the same way. Succession and estate matters here need a licensed Louisiana attorney, not general guidance from a formation guide.
Step 1: Choose and Reserve Your LLC Name
Your LLC name has to be distinguishable from existing registered names in Louisiana and needs a designator like "LLC" or "Limited Liability Company."
- Search first. Check name availability through the Secretary of State's business database before filing anything.
- Reserve it if you're not ready to file. Louisiana lets you reserve a name for 120 days using Form #398, for a $25 fee, which keeps a competitor from grabbing it first.
- No publication requirement. Louisiana doesn't require newspaper publication to form an LLC. Older sources claiming otherwise are typically outdated or confusing LLC formation with unrelated Louisiana civil-procedure publication rules, like those for successions, which are a separate matter entirely.
Step 2: Appoint a Registered Agent
Louisiana requires a registered agent with a physical Louisiana street address, no PO boxes, mail drops, or virtual offices, under La. R.S. 12:1308. The agent must be available to receive legal notices and service of process on the LLC's behalf.
Louisiana has a quirk worth knowing before you pick one:
- The 30-day resignation window matters. If your registered agent resigns, you have 30 days to file a statement of change appointing a replacement.
- Miss it, and the state steps in. If the LLC doesn't name a new agent within that window, the Secretary of State's own office becomes the registered office by default for service-of-process purposes. That's not a status you want your business sitting in, since it means legal notices go through a state office instead of directly to you.
- A commercial registered agent service is the standard fix if you're not physically based in Louisiana, and most also scan and forward mail.
Step 3: File Your Articles of Organization
Form #365, the Articles of Organization, is what legally creates your Louisiana LLC. You file it with the Louisiana Secretary of State, Commercial Division, either online through the geauxBIZ portal or by mail.
- Filing fee: $100 currently. This rises to $125 effective October 1, 2026, under Act 921 of the 2026 Regular Legislative Session, so confirm which fee applies on your filing date.
- Agency: Louisiana Secretary of State, Commercial Division, via geauxBIZ.
- Processing time isn't clearly published by the Secretary of State. It's commonly reported around 3 to 7 business days; confirm current timing when you file.
- Expedited options exist: a 24-hour expedite currently costs $30 (rising to $35 on October 1, 2026), and a same-day "while you wait" priority expedite currently costs $50 (rising to $60 on the same date).
Once the state approves this filing, your LLC legally exists, and the tax and compliance clock covered in the next two steps starts running.
Step 4: Get an EIN, Even Without an SSN
An Employer Identification Number (EIN) is what the IRS uses to identify your LLC for tax purposes, and you'll need one to open a US bank account or file taxes. It's free directly from the IRS. Founders with a Social Security Number or ITIN can typically apply online and get one in minutes.
Founders without either use Form SS-4 instead, submitted by phone, fax, or mail. That route can take anywhere from same-day to several weeks, depending on IRS volume and how completely the form was filled out. Getting the responsible-party details right the first time matters more on this path, since a rejected submission means starting the wait over.
| Method | Who can use it | Typical speed |
|---|---|---|
| Online EIN application | SSN or ITIN holders | Minutes |
| Form SS-4 (phone, fax, or mail) | Founders without an SSN or ITIN | Same-day to several weeks |
Step 5: File Form 5472 if the LLC Is Foreign-Owned
If your single-member LLC is 25% or more foreign-owned, the IRS requires an annual Form 5472 filing, even at zero revenue. Many founders assume a dormant or low-activity LLC has nothing to report. That assumption is exactly what triggers the penalty.
- Filed alongside a pro forma Form 1120, a placeholder corporate return required with the 5472, even though the LLC itself owes no separate corporate tax.
- Reports transactions between the LLC and its foreign owner, such as capital contributions or payments for services.
- Due on the same schedule as your income tax return, and extensions can typically be requested the same way.
Note: the IRS's stated minimum penalty for a late or missing Form 5472 is $25,000, per form, per year, whether or not the LLC made a dollar. There's no waiver for founders who didn't know the requirement existed.
Step 6: Handle Louisiana's Ongoing Compliance
Forming the LLC isn't the finish line. Louisiana has its own recurring filings and a tax environment that changed significantly in 2025.
Annual Report
Louisiana requires an Annual Report every year, due on or before the anniversary date of your LLC's formation. You can file up to 30 days early. The fee is $30 by mail or $35 online.
Missing the deadline puts the LLC in "not in good standing" status. Continued non-filing over multiple consecutive years can eventually lead toward state revocation, though the exact multi-year trigger isn't clearly spelled out on a primary Secretary of State statute page, so treat that specific timeline as a reason to file on time rather than a hard countdown to test.
State Income Tax
Louisiana overhauled its individual income tax structure in 2025. Following a constitutional amendment voters approved in November 2024, the state replaced its former graduated brackets, which ran from 1.85% to 4.25%, with a flat 3% rate effective January 1, 2025, and applying through 2026. The standard deduction also increased substantially as part of the same reform.
Separately, Louisiana's corporate franchise tax is being repealed starting in 2026. That's only relevant if your LLC elects corporate tax treatment rather than the default pass-through treatment.
Your Operating Agreement Does More Work Here Than in Other States
This is where the civil-law point from earlier becomes practical instead of theoretical. Because Louisiana courts interpret agreements against the codified Civil Code and actual intent, a generic operating agreement pulled from a common-law-state template can leave real gaps.
Specifically, if you want a member's heirs to inherit full voting membership rather than just an economic assignee interest, your operating agreement needs to say so explicitly. Louisiana's default rule won't get you there on its own. This is a drafting decision worth a Louisiana attorney's review, not a boilerplate download.
Common Mistakes to Avoid
- Using a common-law-state operating agreement template as-is: language that works fine in Delaware or Wyoming may not carry the same legal weight under Louisiana's civil-code framework. Have it reviewed by Louisiana counsel before you sign it.
- Treating the EIN as the finish line: for a foreign-owned LLC, the EIN is closer to the starting gun on an annual Form 5472 filing obligation than the end of the process.
- Skipping Form 5472 because there's no revenue yet: the filing requirement doesn't care whether the LLC has made money.
- Using a home or friend's address as the registered agent: it can put the LLC out of good standing and exposes a personal address on public record.
- Assuming your membership interest passes automatically to heirs: under Louisiana law it doesn't, unless the operating agreement says so.
- Missing the Annual Report deadline: it's tied to your formation anniversary, not a fixed calendar date, which makes it easy to lose track of.
How FinStackk Helps
FinStackk is an accounting and tax compliance platform for U.S. businesses, helping you go from incorporation to ongoing accounting, tax, and compliance, all in one place.
We handle Louisiana LLC formation end to end through Fin-Start, including EIN applications and registered agent service, so you're not tracking the 30-day resignation window or a missed statement of change on your own.
Once your LLC exists, Fin-Tax keeps ongoing filings, including Form 5472 and Louisiana's Annual Report, on a proactive deadline calendar instead of leaving you to track anniversary dates yourself. Book a free demo to see both in action.
FAQ
Does Louisiana's civil-law system actually affect my LLC's operating agreement?
Yes, in a way most founders don't expect. Louisiana courts interpret contracts, including operating agreements, against the codified Louisiana Civil Code and the parties' actual intent, rather than accumulated case precedent the way the other 49 states do. An operating agreement written for a common-law state like Delaware or Wyoming may use terms that don't map cleanly onto Louisiana's civil-code concepts. Having a Louisiana attorney review your operating agreement, rather than reusing a generic template, is worth the cost here.
How much does it cost to file an LLC in Louisiana, and is the fee changing?
The Articles of Organization filing fee is currently $100. It's set to rise to $125 effective October 1, 2026, under Act 921 of the 2026 Regular Legislative Session. If you're filing close to that date, confirm which fee applies before you submit. Expedite fees are also rising on the same date, from $30 to $35 for 24-hour service and from $50 to $60 for same-day priority service.
What happens if my Louisiana registered agent resigns and I don't replace them in time?
You have 30 days to appoint a new registered agent after one resigns. If the LLC doesn't file a statement of change within that window, the Louisiana Secretary of State's own office becomes the registered office by default for service-of-process purposes. That means legal notices route through a state office rather than directly to you, which can delay your awareness of a lawsuit or compliance issue. Replacing an outgoing agent promptly avoids this altogether.