Single-Member LLC in Montana (2026)

Q: How is a single-member LLC taxed in Montana?

By federal default a single-member LLC is a disregarded entity, so its profit is reported on the owner's Form 1040 Schedule C and is subject to 15.3% self-employment tax on Schedule SE. Montana then taxes that profit on the owner's Montana individual income tax return.

Fact-checked by the LegalGlass editorial team against primary sources · Published Aug 6, 2026 · Last updated Aug 6, 2026

A single-member LLC in Montana is by federal default a "disregarded entity," so its profit is reported on your Form 1040 Schedule C with 15.3% self-employment tax — while still giving you a liability shield. You form one by filing Articles of Organization with the Montana Secretary of State for a $35 fee; the annual report is due April 15 for $20, and Montana has no general sales tax.

Quick Answer

Default tax status: Disregarded entity — profit on Form 1040 Schedule C
Self-employment tax: 15.3% on net profit via Schedule SE
Formation: Articles of Organization with the Montana SoS, $35 fee
Registered agent: Required — Montana street address
Annual report: Due April 15, $20 fee
Sales tax: None — Montana has no general statewide sales tax

What a Single-Member LLC Is

A single-member LLC (SMLLC) is a limited liability company with exactly one owner. Like any LLC, it is a legal entity separate from its owner, which is what provides limited liability: your personal assets — your home, savings, and personal property — are generally protected from the business's debts and lawsuits. That protection is the main reason a solo owner forms an LLC instead of operating as a sole proprietor, which offers no shield at all.

For federal tax purposes, though, the IRS treats a single-member LLC differently from how it treats the entity legally. By default the SMLLC is a disregarded entity: the IRS looks through it and taxes the owner as if the business were a sole proprietorship. So you keep the legal liability shield of an LLC while reporting income the simple way — a distinction that trips up many new owners. You can change this default by electing corporate or S-corporation taxation, covered below. See the single-member LLC hub and glossary for the underlying terms.

How a Montana Single-Member LLC Is Taxed

Because the default SMLLC is a disregarded entity, its profit flows straight to you. You report business income and expenses on Schedule C, attached to your Form 1040, and the net profit is added to your personal income. On that same profit you owe self-employment tax of 15.3% — 12.4% for Social Security up to the annual wage base plus 2.9% for Medicare — figured on Schedule SE. You can deduct the employer-equivalent half of that tax when calculating adjusted gross income. Because no employer withholds for you, you generally make quarterly estimated tax payments to the IRS.

Montana then taxes the same pass-through profit on your Montana individual income tax return, administered by the Montana Department of Revenue. A major Montana advantage is that the state has no general sales tax, so most SMLLCs do not register for or collect sales tax (some specific goods and localities have narrow exceptions). If your profits grow, you can elect S-corporation tax treatment to split income between a reasonable salary and distributions and reduce self-employment tax; our business tax hub and Montana LLC tax filing guide walk through the trade-offs.

Keep in mind that being a disregarded entity is only the federal default, not a permanent status. A single-member LLC can file Form 8832 to be taxed as a C corporation, or Form 2553 to be taxed as an S corporation, if that produces a better result as the business grows. Until you make such an election, though, the LLC and its owner are one taxpayer for income-tax purposes, which is why the profit appears on your personal return rather than on a separate business return. That simplicity is one of the main attractions of the single-member LLC for solo founders.

Forming a Single-Member LLC in Montana

You create a Montana LLC by filing Articles of Organization with the Montana Secretary of State (sosmt.gov). The Secretary of State charges a $35 filing fee for the Articles, which name the LLC, its registered agent and registered office, and the organizer. Montana filings are handled through the Secretary of State's online portal, and once accepted the LLC legally exists. Before filing, run the Montana business entity search to confirm your name is available, and see the Montana Articles of Organization and Montana LLC cost guides for the full detail.

Every Montana LLC must appoint and maintain a registered agent — an individual or company with a physical Montana street address available during business hours to accept legal documents and state notices. You can act as your own agent if you have a Montana address, or hire a commercial service. Our Montana registered agent guide explains who qualifies and how to change agents. If you operate under a different brand name, review the Montana DBA filing process, which is separate from forming the LLC.

EIN for a Single-Member LLC

An Employer Identification Number (EIN) is a free federal tax ID from the IRS. For a single-member LLC, an EIN is required if you have employees or if you elect to be taxed as a corporation or S corporation. If neither applies, an EIN is technically optional — a disregarded SMLLC with no employees can use the owner's Social Security number — but getting one is recommended. It lets you keep your SSN off vendor forms and business paperwork, and most banks require an EIN to open a business account.

Apply directly through the IRS, where the number is issued immediately and at no cost; avoid third-party sites that charge for it. If you are a non-U.S. owner without a Social Security number, review the IRS rules and our guide to the ITIN. For a step-by-step walkthrough of the application, read how to get an EIN.

Operating Agreement and Records

Montana does not require you to file an operating agreement, and it is easy to assume a one-owner business does not need one. In practice, an operating agreement is recommended even for a single member. It documents that the LLC is a genuine separate entity, sets out how the business is managed and how profits and distributions are handled, and helps rebut any argument that the LLC is merely your alter ego — an argument that could otherwise let a creditor "pierce the veil" and reach your personal assets. The state does not keep the agreement; you retain it with your records. Our Montana operating agreement guide covers what to include.

Maintaining separation is the practical heart of keeping your liability shield. Open a dedicated business bank account, run all business income and expenses through it, keep clean books, and never pay personal bills directly from the LLC. These habits, together with the operating agreement and timely state filings, are what make the limited-liability protection hold up if it is ever tested.

Signing habits matter, too. When you enter contracts, sign leases, or take on debt, do so in the name of the LLC and in your capacity as its member or manager — not personally. Signing personally, or personally guaranteeing a loan, can expose you to liability the LLC would otherwise absorb. Small, consistent formalities like these are inexpensive and are exactly what a court looks at if a creditor challenges whether the LLC is a real, respected entity.

Ongoing Requirements and the Annual Report

After formation, the main recurring obligation is the Montana annual report, filed with the Secretary of State. It is due April 15 each year and carries a $20 fee. The report confirms your current information — principal address, registered agent, and management — and filing on time keeps the LLC in good standing. Missing the deadline can lead to late penalties and, eventually, involuntary dissolution of the LLC by the state, which strips away the liability protection you formed the entity to get.

Beyond the annual report, keep your registered agent current, pay your Montana and federal income taxes (including quarterly estimates), and renew any local or professional licenses that apply to your work. When it is time to close the business, follow the formal steps in our Montana dissolution guide and confirm license and registration requirements in the Montana business license overview so nothing is left open.

Frequently Asked Questions

How is a single-member LLC taxed in Montana?

By federal default it is a disregarded entity, so profit is reported on the owner's Form 1040 Schedule C and is subject to 15.3% self-employment tax on Schedule SE. Montana then taxes that profit on the owner's Montana individual income tax return.

How much does it cost to form an LLC in Montana?

The Montana Secretary of State charges a $35 filing fee for the Articles of Organization that create an LLC. After formation, the LLC files an annual report each year, which is due April 15 with a $20 fee.

Does a single-member LLC protect my personal assets?

Yes. Even with one owner, an LLC is a separate legal entity that generally separates your personal assets from business debts. To preserve that shield, keep a separate bank account and records and avoid mixing personal and business finances.

Does a Montana single-member LLC need an EIN?

An EIN is required if the LLC has employees or elects corporate taxation. Otherwise it is optional but recommended, because it lets you avoid using your Social Security number and is usually needed to open a business bank account.

Does Montana have a sales tax for my LLC?

No. Montana has no general statewide sales tax, so most single-member LLCs do not collect sales tax. Your LLC still pays income tax on its profit through your Montana individual income tax return and may owe other industry-specific taxes.

More Montana business guides

Form An Llc In Business License In Dissolve An Llc In Annual Report Articles Of Organization Business Entity Search Llc Cost Dba Filing Llc Tax Filing Operating Agreement Registered Agent

Sources

IRS — Single Member Limited Liability Companies (disregarded entity).
IRS — About Schedule C (Form 1040) (report profit or loss).
IRS — Self-Employment Tax (15.3% rate).
IRS — About Schedule SE (Form 1040).
IRS — Limited Liability Company (LLC) (classification and elections).
IRS — Get an Employer Identification Number (free EIN).
IRS — Estimated Taxes (quarterly payments).
Montana SoS — Business Services (Articles of Organization, filing).
Montana SoS — Business Forms and Fees ($35 LLC filing fee).
Montana SoS — Annual Reports (April 15 due date, $20).
Montana DOR — Individual Income Tax (pass-through profit).
Montana Code — Title 35, Chapter 8 (LLC Act) (via Justia).
Cornell LII — 26 CFR § 301.7701-3 (entity classification, check-the-box).
U.S. Small Business Administration — Choose a Business Structure.

LegalGlass provides general information for educational purposes and is not a law firm or a substitute for advice from a licensed attorney or tax professional. Laws, fees, and thresholds change; verify current requirements with the Montana Secretary of State, the Montana Department of Revenue, and the IRS before acting.