South Dakota LLC Operating Agreement (2026)
No - South Dakota does not require an LLC to have an operating agreement, and the state does not file it. But one is strongly recommended: it is a private, internal contract that sets ownership, management, and profit rules and overrides South Dakota's statutory default rules. It matters even though South Dakota has no state personal income tax.
Quick Answer
- Required?
- No - not required by South Dakota law, but strongly recommended
- Filed with the state?
- No - kept privately with company records
- Governing law
- SD Codified Laws Title 47, Chapter 47-34A (Uniform LLC Act)
- Default management
- Member-managed unless you choose manager-managed
- Purpose
- Overrides statutory defaults; documents ownership and governance
- State income tax
- None - South Dakota has no personal income tax
Is an Operating Agreement Required in South Dakota?
No. South Dakota law does not require a limited liability company to adopt an operating agreement, and the Secretary of State does not collect or file one. The only document you file to create the LLC is the Articles of Organization. The operating agreement is separate, private, and optional as a matter of law. Despite that, nearly every well-run South Dakota LLC has one, because the alternative is letting the state's default statutes decide questions the members should decide themselves.
South Dakota's LLC law is codified in Title 47, Chapter 47-34A of the South Dakota Codified Laws, the state's Uniform Limited Liability Company Act. That chapter expressly recognizes the operating agreement and lets the members use it to structure their relationship, subject to a few non-waivable rules. In other words, the statute assumes you may want your own agreement and gives it legal force. For the concept in general, see our operating agreement overview.
What an Operating Agreement Does
An operating agreement is the internal "rulebook" for your LLC. It is a contract among the members (or, for a single-member LLC, a declaration by the sole member) that governs how the company is owned, managed, and operated. Because it is a contract, it can override most of the default rules the state would otherwise apply, letting you tailor the LLC to your actual arrangement rather than accepting one-size-fits-all statutory provisions.
The agreement also reinforces your limited liability. One of the factors courts weigh when deciding whether to "pierce the veil" and hold owners personally liable is whether the LLC was treated as a genuine, separate entity. A signed operating agreement, followed in practice, is strong evidence of that separateness. Banks, investors, and lenders frequently ask to see it, and it resolves disputes among members before they become lawsuits. See our guide to the single-member LLC for how this plays out with one owner.
What to Include in the Agreement
While South Dakota does not dictate the contents, a thorough operating agreement typically addresses the core areas that keep an LLC running smoothly and prevent disputes:
- Ownership. Each member's name, capital contribution, and percentage interest in the LLC.
- Management structure. Whether the LLC is member-managed or manager-managed, and the authority of each.
- Voting. How decisions are made, what each member's vote is worth, and which actions need a supermajority or unanimity.
- Profits and losses. How income, losses, and distributions are allocated among members.
- Transfers and buy-outs. Rules for admitting new members, transferring interests, and what happens on a member's death, withdrawal, or divorce.
- Dissolution. The events that wind up the LLC and how remaining assets are distributed.
Keeping these terms explicit avoids relying on statutory defaults that may not fit. For the tax side of ownership and distributions, see the business tax hub.
Member-Managed vs Manager-Managed
A key choice the operating agreement records is the LLC's management structure. In a member-managed LLC, all members share authority to run the business and bind it in contracts - the default for most small South Dakota LLCs. In a manager-managed LLC, the members appoint one or more managers (who may be members or outsiders) to handle day-to-day operations, while the members step back into a more passive, investor-like role.
Under South Dakota's Uniform LLC Act, an LLC is member-managed by default unless the members agree to manager management. Because the choice affects who can sign contracts and who owes duties to the company, it should be stated clearly in both the Articles of Organization and the operating agreement so third parties and the members themselves know who has authority. The agreement can also spell out how managers are appointed, removed, and compensated.
Single-Member vs Multi-Member Agreements
Both single-member and multi-member LLCs benefit from an operating agreement, but they serve slightly different purposes. In a multi-member LLC, the agreement is essential because it governs the relationship among owners: how they vote, split profits, resolve deadlocks, and handle a member who wants out. Without it, the statutory defaults - which often assume equal say and equal splits regardless of contribution - control, and that can create real friction.
In a single-member LLC, there is no one to negotiate with, so the agreement is shorter, but it still matters. It documents that the LLC is a separate entity, sets succession if the owner dies or becomes incapacitated, and satisfies banks and other parties that expect to see one. For federal tax, a single-member LLC is a disregarded entity and a multi-member LLC is a partnership by default; the operating agreement should be consistent with that treatment and any EIN you obtain.
South Dakota Statutory Default Rules
When an operating agreement is silent - or does not exist - the default rules in Chapter 47-34A fill the gaps. These "gap-filler" provisions cover things like management rights, voting, distributions, and how a member can dissociate. The defaults are reasonable, but they are generic: they treat the LLC as the legislature imagined a typical company, not as you specifically intend. The whole point of an operating agreement is to replace the defaults you dislike with terms you choose.
The statute does set a few non-waivable limits that an operating agreement cannot override - for example, it generally cannot eliminate the duty of good faith and fair dealing or unreasonably restrict a member's access to records. Within those limits, the members have broad freedom to design their own arrangement. Because the exact default and non-waivable provisions are technical, read the current text of Chapter 47-34A or consult an attorney when drafting terms that depart significantly from the norm.
No State Income Tax - and Why the Agreement Still Matters
South Dakota is one of a handful of states with no state personal income tax and no broad corporate income tax, which is a major reason businesses locate there. That means LLC profits are not taxed at the South Dakota income-tax level; they flow through to the members and are taxed federally, and members still handle federal self-employment tax where it applies. South Dakota sales and use tax and certain other taxes administered by the Department of Revenue can still apply depending on what the business does.
The absence of a state income tax does not reduce the value of an operating agreement, because the agreement is about governance and liability, not state income tax. Ownership splits, management authority, buy-sell terms, and evidence of the LLC's separate existence all remain just as important. If anything, clear governance is what lets owners take full advantage of a favorable tax environment without internal disputes. For how to create the entity in the first place, see how to form an LLC in South Dakota.
Frequently Asked Questions
Is an operating agreement required for a South Dakota LLC?
No. South Dakota law does not require an LLC to have an operating agreement, and the Secretary of State does not collect or file one. However, it is strongly recommended, because without it the statutory default rules in the South Dakota Codified Laws govern your LLC by default.
Does South Dakota file my LLC operating agreement?
No. The operating agreement is an internal document that the members keep privately with their records. You do not submit it to the South Dakota Secretary of State, and it is not part of the public Articles of Organization filing, so it stays confidential.
Does a single-member South Dakota LLC need an operating agreement?
It is not legally required, but recommended. Even with one owner, a written agreement documents that the LLC is a separate entity, sets management and succession rules, and helps preserve limited liability. Banks and courts often expect to see one.
What happens without an operating agreement in South Dakota?
The default rules in the South Dakota Uniform Limited Liability Company Act (Title 47, Chapter 47-34A) govern the LLC. Those defaults may not match what the members want - for example on voting, profit sharing, or transfers - so an operating agreement lets you override them.
Member-managed or manager-managed in South Dakota?
A South Dakota LLC is member-managed by default, meaning all members share management authority. You can instead choose manager-managed, where designated managers run day-to-day operations. The operating agreement, together with the Articles of Organization, records which structure applies.
Does South Dakota have a state income tax on LLCs?
No. South Dakota has no state personal income tax and no corporate income tax on most businesses, so LLC profits are not taxed at the state income-tax level. Federal taxes and South Dakota sales and use tax still apply, and the operating agreement still matters for governance.
Related
- LLC operating agreement (cluster hub)
- How to form an LLC in South Dakota
- South Dakota registered agent
- Single-member LLC explained
- How to get an EIN
- Business tax basics
- S-Corp vs LLC
More South Dakota business guides
Form An Llc In Registered Agent Articles Of Organization Business Entity Search Certificate Of Formation Dba Filing Llc Cost Llc Tax Filing Annual Report Business License In
Sources
- South Dakota Secretary of State - Business Services (Articles of Organization; no operating agreement filed).
- South Dakota Secretary of State - Business Forms & Fees.
- South Dakota Secretary of State - Business Filing Search (name availability).
- South Dakota Codified Laws - Title 47, Chapter 47-34A, Uniform Limited Liability Company Act.
- South Dakota Codified Laws - Operating agreement provisions (47-34A).
- South Dakota Codified Laws - Management of the company (member vs manager).
- South Dakota Department of Revenue - Business Taxes (no state income tax; sales tax).
- South Dakota Department of Revenue - Sales & Use Tax.
- IRS - Limited Liability Company (LLC) (default classification).
- IRS - Single Member Limited Liability Companies.
- IRS - Partnerships (multi-member default).
- IRS - Employer Identification Number (EIN).
- Cornell Legal Information Institute - Operating Agreement (Wex).
- Cornell Legal Information Institute - Limited Liability Company (Wex).
- 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 and statutory defaults change; verify current requirements with the South Dakota Secretary of State and the South Dakota Codified Laws before acting.