South Dakota LLC Operating Agreement: Free Guide (2026)
South Dakota doesn't require an operating agreement — but the state's default rules will run your company if you don't write your own. Here's what to include, why your bank asks for it anyway, and a builder that generates your custom clause checklist.
A South Dakota LLC operating agreement is not legally required and is never filed with the Secretary of State — but every LLC should have one. It’s the internal contract setting ownership percentages, profit splits, voting rules, and exit terms. Without it, South Dakota’s default statutory rules govern, which may not match your actual deal. Banks routinely require a signed agreement to open a business account, and for single-member LLCs it’s core evidence of entity separateness. Cost: $0 with a template.
- Required by South Dakota?
- No
- Filed with the state?
- No — internal
- Banks ask for it?
- Usually yes
- Cost (template)
- $0
- Governing law
- SDCL 47-34A
- Single-member LLCs?
- Yes — still needed
Why You Need One (Even Though South Dakota Doesn't Ask)
The operating agreement is the contract between your LLC's members — and between you and your future self. South Dakota law (SDCL 47-34A) grants broad freedom of contract: write your rules and they govern; write nothing and the state's default rules fill every gap on management, voting, and distributions, whether they match your intentions or not.
- Banks require it: expect to hand over a signed agreement, your confirmed Articles, and your EIN letter to open the account.
- It hardens your liability shield: courts weighing veil-piercing claims look for evidence the LLC is a real, separate entity — a signed agreement is Exhibit A.
- It settles the hard questions early: profit splits, buyouts, a member's death or exit — answered while everyone still agrees.
- It genuinely matters given how little else South Dakota requires: with no franchise tax, no income tax, and a light annual filing, your operating agreement is one of the few durable internal records of how the business actually works.
The default-rule trap: if your real deal — who invested what, who decides, who gets which share — differs from the statute's defaults and you never wrote it down, the statute wins. That's how handshake partnerships end up in South Dakota courts arguing over what everyone "understood."
Build Your Clause Checklist
South Dakota Operating Agreement Clause Builder
3 questions · custom clause checklist · educational, not legal advice
Checklist is educational. Multi-member LLCs with significant assets or unequal deals should have a South Dakota business attorney review the final agreement.
The Core Sections Every South Dakota Agreement Needs
Formation & purpose
Name, formation date (from your confirmed Articles), registered agent, and a broad purpose clause.
Members & ownership percentages
Who owns what, each member's capital contribution, and how new members are admitted.
Profit & loss allocation
How profits split — by percentage or a documented custom formula — and when distributions happen.
Management & voting
Member- vs manager-managed, decision thresholds, and any items requiring unanimity.
Transfer restrictions & buy-sell
Right of first refusal, valuation method, and triggers: exit, death, disability, divorce.
Dissolution & wind-down
What ends the company and how assets are distributed under South Dakota law.
Plus: tax classification and representative, banking authority, indemnification, amendment procedure, and severability. Start from the free template in our national operating agreement guide.
Single-Member LLCs: Yes, Still
Your bank will likely ask for it, and — more important — a single-member LLC's liability shield is the thinnest, so a signed agreement documenting separateness is your best evidence if anyone attacks it. It's also where a solo founder names a successor. Thirty minutes, the same afternoon your Articles clear.
Keeping It Current
Revisit the agreement when ownership changes, a member's role shifts, or you elect S-Corp taxation. Amendments follow whatever procedure the agreement sets — which is why the amendment clause matters on day one.
Ahmad Adil's Take: the operating agreement is the cheapest insurance in business, and South Dakota's ultra-favorable tax and compliance environment makes it especially easy to treat as an afterthought — you've paid $150, there's no income tax to worry about, and it's tempting to feel completely done. Resist that. Every partnership blowup I've watched traces back to a question the founders never answered on paper: who decides, who gets what, who buys whom out and at what price. South Dakota hands you total freedom to write those answers however you like; the mistake is not using it. Multi-member LLCs, do this before the money starts moving. Single-member owners, do it the same afternoon your Articles clear and file it with your EIN letter.
- ✓Forms your South Dakota LLC for $39 + the $150 state fee
- ✓Files online with the Secretary of State
- ✓Free South Dakota registered agent the first year
- ✓No upsells · No data selling · Privacy by Default
Disclosure: LLC School may earn a commission via this link, at no cost to you. See our advertising disclosure.
South Dakota LLC — FAQ
Ahmad Adil is the founder and CEO of LLC School. The figures here — the $150 Articles of Organization, the $50 annual report due your anniversary month, and South Dakota having no personal income tax at all — reflect current South Dakota Secretary of State guidance. This is educational content, not legal or tax advice.
About Ahmad Adil → Compare States →