Key Takeaways
- Montana extends charging-order-as-exclusive-remedy protection to single-member LLCs the same as multi-member LLCs — Mont. Code Ann. § 35-8-705; but see White v. Longley, 2010 MT 254
- Montana does not legally require a written operating agreement, but you should have one anyway
- This is Montana's single most important SMLLC finding, and it's more dangerous than ordinary veil-piercing because it bypasses the entire piercing framework. In White v. Longley, 2010 MT 254, the Montana Supreme Court let a plaintiff hold a sole member/manager personally liable without any veil-piercing analysis at all. The Court reinterpreted the statutory liability-shield language — a member/manager is 'not personally liable for an obligation of the company solely by reason of being or acting as a member or manager' — to mean the shield only protects conduct undertaken solely in an LLC capacity. In effect, a plaintiff can argue around the shield just by characterizing the member's acts or omissions as individually actionable in contract or tort, without meeting the traditional high bar for piercing the corporate veil (fraud, injustice, complete domination). Weaver v. Tri-County Implement, Inc., 2013 MT 309, clarified but did not reverse White. This is widely flagged by Montana practitioners as uniquely risky precisely because it sidesteps the protections a sole owner would normally rely on.
- Montana has a graduated personal income tax with two brackets — roughly 4.70% and a top marginal rate of 5.65% (2026, reduced from a former 5.9% top rate under recent reform) — so a single-member LLC owner pays that rate on the LLC's pass-through profit in addition to federal income tax and federal self-employment tax. Montana has no state sales tax, a related but separate business-law quirk.
- Same-day single-member LLC formation and a solo-owner operating agreement available through LLC Attorney, at no markup on state fees
A single-member LLC is the most common way solo owners in Montana structure their business — but Montana is also the state in this guide most likely to surprise a reader, because a Montana Supreme Court decision, White v. Longley, lets courts impose personal liability on a sole member without ever going through the traditional veil-piercing analysis.
This guide covers exactly how a Montana single-member LLC works in 2026 — the charging-order statute's protective text, why White v. Longley matters more in practice, whether you need a written operating agreement, and how the LLC is taxed at both the federal and state level.
What Is a Montana Single-Member LLC?
A single-member LLC (SMLLC) is a limited liability company with exactly one owner. It's formed the same way as any other Montana LLC — same Articles of Organization, same registered agent requirement — the only difference is ownership structure. By default, the IRS treats a single-member LLC as a "disregarded entity," meaning its income passes through to the owner's personal tax return rather than being taxed at the entity level.
Does Montana Protect Single-Member LLCs From Charging Orders?
A charging order limits a creditor of an LLC member (a personal creditor, not a business creditor) to collecting distributions from that member's interest — rather than letting the creditor seize LLC assets outright or force a sale. Many states extend this protection to multi-member LLCs without question, but treat single-member LLCs differently since there's no other member to protect from an unwanted co-owner.
Yes, on the statute's face — but read this alongside the alter-ego warning below, because Montana's real SMLLC risk isn't the charging-order statute. Mont. Code Ann. § 35-8-705 states the charging order 'is the judgment creditor's exclusive remedy' and even permits a foreclosure sale of only the distributional interest (the purchaser doesn't become a member), applying uniformly regardless of member count. On paper this is protective. In practice, Montana courts have a separate line of authority that can reach a sole member's personal assets without ever needing to use this statute at all — see White v. Longley below.
Do I Need an Operating Agreement for My Montana SMLLC?
No. Montana does not legally require a written operating agreement for an LLC of any size — Mont. Code Ann. § 35-8-109 provides an LLC 'may' enter into an operating agreement. Given White v. Longley (below), a carefully drafted operating agreement that clearly documents when the member is acting solely in an LLC capacity is more valuable in Montana than the bare statutory minimum suggests.
An operating agreement can name a successor member and include transfer-on-death language, letting your Montana LLC interest pass to an heir without going through probate — worth including even though Montana doesn't require the document itself.
Is a Montana Single-Member LLC Easier to Pierce?
Courts everywhere apply the corporate veil doctrine to LLCs, but with only one member, there's no second owner's independent conduct to point to as evidence the company is a genuinely separate entity — which is why single-member LLCs face more practical scrutiny than multi-member LLCs even where the legal test is identical on paper.
This is Montana's single most important SMLLC finding, and it's more dangerous than ordinary veil-piercing because it bypasses the entire piercing framework. In White v. Longley, 2010 MT 254, the Montana Supreme Court let a plaintiff hold a sole member/manager personally liable without any veil-piercing analysis at all. The Court reinterpreted the statutory liability-shield language — a member/manager is 'not personally liable for an obligation of the company solely by reason of being or acting as a member or manager' — to mean the shield only protects conduct undertaken solely in an LLC capacity. In effect, a plaintiff can argue around the shield just by characterizing the member's acts or omissions as individually actionable in contract or tort, without meeting the traditional high bar for piercing the corporate veil (fraud, injustice, complete domination). Weaver v. Tri-County Implement, Inc., 2013 MT 309, clarified but did not reverse White. This is widely flagged by Montana practitioners as uniquely risky precisely because it sidesteps the protections a sole owner would normally rely on.
Formalities to maintain: keep a dedicated business bank account and never commingle personal and LLC funds, sign every contract and check in the LLC's name (not your own) and be scrupulous about documenting that you are acting solely in your LLC capacity in every transaction (this is the exact issue White v. Longley turned on), maintain a written operating agreement even though it isn't required, keep basic records of major decisions and distributions, and adequately capitalize the LLC for the business it actually runs.
Can a Montana Single-Member LLC Use a Series Structure?
Montana authorizes series LLCs under HB 362 (effective October 1, 2013) — Montana was reportedly the 10th state to authorize the structure. For a single-member owner running multiple properties or business lines, a Montana series LLC can wall off each line's liability under one formation filing, though given White v. Longley's reasoning about acting 'solely in an LLC capacity,' a series structure makes it even more important to keep each series' affairs genuinely separate and well-documented.
How Is a Montana Single-Member LLC Taxed?
By default, the IRS disregards a single-member LLC for federal tax purposes — you report business income on Schedule C of your personal return, and you'll owe self-employment tax (Social Security and Medicare) on net earnings. You can elect corporate taxation instead by filing Form 8832 (C-corp) or Form 2553 (S-corp) if that fits your situation better — but unlike a multi-member LLC, a single-member LLC can never elect partnership taxation, since that requires more than one owner.
Montana has a graduated personal income tax with two brackets — roughly 4.70% and a top marginal rate of 5.65% (2026, reduced from a former 5.9% top rate under recent reform) — so a single-member LLC owner pays that rate on the LLC's pass-through profit in addition to federal income tax and federal self-employment tax. Montana has no state sales tax, a related but separate business-law quirk.
Montana's annual report fee is waived entirely if filed on time (between January 1 and April 15); a $15 late fee applies if filed after April 15 — a genuinely low-cost ongoing compliance obligation as long as you file on schedule.
Does My Montana SMLLC Need an EIN?
Technically, a single-member LLC with no employees can use the owner's SSN for federal tax filing purposes. In practice, get an EIN anyway (it's free and instant from the IRS) — nearly every Montana bank requires one to open a business account, and using an EIN instead of your SSN keeps your personal information off business paperwork and vendor forms.
White v. Longley remains controlling Montana Supreme Court precedent as of 2026; Weaver v. Tri-County Implement clarified but did not reverse it. Treat single-member liability exposure in Montana as a live, actively-litigated risk rather than a settled, favorable question.
How to Set Up Your Montana Single-Member LLC
If You Do It Yourself
Step 1 — File your Articles of Organization.
Form your LLC the same way any other Montana LLC is formed — the state doesn't use a different form or process for single-member LLCs.
Step 2 — Appoint a registered agent.
Montana calls this role a "Registered Agent" — you can serve as your own if you have a physical in-state address, or use a commercial service for privacy and reliability.
Step 3 — Draft an operating agreement built for a solo owner.
No. Montana does not legally require a written operating agreement for an LLC of any size — Mont. Code Ann. § 35-8-109 provides an LLC 'may' enter into an operating agreement. Given White v. Longley (below), a carefully drafted operating agreement that clearly documents when the member is acting solely in an LLC capacity is more valuable in Montana than the bare statutory minimum suggests. An operating agreement can name a successor member and include transfer-on-death language, letting your Montana LLC interest pass to an heir without going through probate — worth including even though Montana doesn't require the document itself.
Step 4 — Understand your charging-order exposure.
Yes, on the statute's face — but read this alongside the alter-ego warning below, because Montana's real SMLLC risk isn't the charging-order statute. Mont. Code Ann. § 35-8-705 states the charging order 'is the judgment creditor's exclusive remedy' and even permits a foreclosure sale of only the distributional interest (the purchaser doesn't become a member), applying uniformly regardless of member count. On paper this is protective. In practice, Montana courts have a separate line of authority that can reach a sole member's personal assets without ever needing to use this statute at all — see White v. Longley below.
Step 5 — Maintain formalities to avoid alter-ego risk.
keep a dedicated business bank account and never commingle personal and LLC funds, sign every contract and check in the LLC's name (not your own) and be scrupulous about documenting that you are acting solely in your LLC capacity in every transaction (this is the exact issue White v. Longley turned on), maintain a written operating agreement even though it isn't required, keep basic records of major decisions and distributions, and adequately capitalize the LLC for the business it actually runs.
Step 6 — Get an EIN and open a business bank account.
Technically, a single-member LLC with no employees can use the owner's SSN for federal tax filing purposes. In practice, get an EIN anyway (it's free and instant from the IRS) — nearly every Montana bank requires one to open a business account, and using an EIN instead of your SSN keeps your personal information off business paperwork and vendor forms.
Step 7 — Handle ongoing state compliance.
Montana's annual report fee is waived entirely if filed on time (between January 1 and April 15); a $15 late fee applies if filed after April 15 — a genuinely low-cost ongoing compliance obligation as long as you file on schedule. Montana has a graduated personal income tax with two brackets — roughly 4.70% and a top marginal rate of 5.65% (2026, reduced from a former 5.9% top rate under recent reform) — so a single-member LLC owner pays that rate on the LLC's pass-through profit in addition to federal income tax and federal self-employment tax. Montana has no state sales tax, a related but separate business-law quirk.
Step 8 — Watch for Montana-specific SMLLC traps.
The single most important Montana-specific trap is trusting the charging-order statute's strong language as the whole picture — White v. Longley shows a Montana court can impose personal liability on a sole member/manager without any veil-piercing analysis at all, simply by characterizing the member's individual acts as outside their 'solely LLC' capacity. This is a materially different and more easily triggered risk than ordinary piercing, and it's specific to how the member personally conducts business, not just how well the paperwork is kept.
If LLC Attorney Does It for You
- Submit your business details at llcattorney.com — LLC name, registered agent, and ownership information.
- LLC Attorney forms your Montana single-member LLC and drafts a solo-owner operating agreement, including transfer-on-death provisions to keep your business out of probate.
- Receive your finished formation documents, EIN, and operating agreement, plus access to flat-fee attorney consultations (no retainer) for asset-protection questions as your business grows.
When Should You Talk to an Attorney About Your Montana Single-Member LLC?
Talk to an attorney before finalizing your Montana single-member LLC's structure if you'll be personally involved in day-to-day contracts, negotiations, or operational decisions (White v. Longley turns on whether your conduct can be characterized as outside your 'solely LLC' capacity), if asset protection from personal creditors is a primary goal, or if you're considering a Montana series LLC and want documentation practices that hold up under White v. Longley's reasoning.
Is Montana a State Where SMLLC Asset Protection Matters More?
Montana is one of the most consequential states in this guide for a single-member LLC owner specifically because of White v. Longley — the Montana Supreme Court's reinterpretation of the liability-shield statute means a sole member/manager can be held personally liable without a plaintiff ever needing to satisfy the traditional veil-piercing standard. This is a materially different (and more dangerous) risk than ordinary alter-ego exposure, because it removes the high bar (fraud, injustice, domination) that protects owners in most other states.
What You Actually Get With LLC Attorney's Montana SMLLC Formation
The part of forming a Montana single-member LLC that generic templates miss is White v. Longley — most multi-state formation services don't flag that Montana courts can reach a sole member's personal assets without meeting the standard veil-piercing test. LLC Attorney builds your operating agreement and documentation practices around that reality from the start.
- Single-member LLC formation in Montana, starting at $0 + state fees.
- Solo-owner operating agreement with transfer-on-death provisions, starting at $49.
- Charging-order, alter-ego, and tax considerations addressed for your specific state — not a generic multi-state template.
- Access to professionally trained Business Success Advisors at no charge, plus flat-fee attorney consultations (no retainer) for asset-protection questions.
Montana's single-member LLC rules have one real trap — White v. Longley — and LLC Attorney makes sure your operating agreement and business practices account for it from day one.
Ready to Form Your Montana Single-Member LLC?
LLC Attorney forms single-member LLCs in Montana and drafts an operating agreement built for a solo owner, starting at $0 + state fees. See our full pricing for all service tiers.
Frequently Asked Questions
Yes, on the statute's text — Mont. Code Ann. § 35-8-705 makes the charging order the exclusive remedy and applies uniformly regardless of member count. But this statute isn't the real risk for a Montana single-member LLC owner; White v. Longley shows a separate line of case law can reach a sole member personally without needing to use this statute at all.
No, Montana does not legally require a written operating agreement for a single-member LLC. Given White v. Longley, a carefully drafted operating agreement that documents when the member is acting solely in an LLC capacity is worth more in Montana than the bare statutory minimum suggests.
This is Montana's most important risk. In White v. Longley, 2010 MT 254, the Montana Supreme Court let a plaintiff hold a sole member/manager personally liable without any veil-piercing analysis at all, by reinterpreting the liability shield to protect only conduct undertaken solely in an LLC capacity. This bypasses the traditional high bar for piercing entirely, making it a more easily triggered risk than ordinary alter-ego exposure.
No. Montana has no SMLLC-specific statutory text; the general charging-order statute applies uniformly regardless of member count. White v. Longley's effect on sole members comes entirely from case law, not any single-member-specific statute.
No. Partnership taxation requires at least two members. A Montana single-member LLC can only be taxed as a disregarded entity (the default), or elect C-corp or S-corp taxation instead.
Technically optional if the LLC has no employees (you can use your SSN instead), but get one anyway — it's free from the IRS, nearly every Montana bank requires it to open a business account, and it keeps your SSN off business paperwork.
Yes. Your operating agreement can name a successor member and include transfer-on-death language, letting your LLC interest pass to an heir outside of Montana's probate process — even though Montana doesn't require the operating agreement itself.
Adding a second member would not fix the risk White v. Longley created, since that case turned on how the member personally conducted business, not on member count — the reinterpreted liability shield applies to 'a member or manager' regardless of how many members the LLC has. The better protection in Montana is disciplined documentation of when you're acting solely in your LLC capacity, which is worth discussing with an attorney rather than assuming a second member solves it.
Yes. LLC Attorney forms single-member LLCs in Montana, including a solo-owner operating agreement, starting at $0 + state fees.