How to Start an LLC in South Dakota

South Dakota is one of the most tax-friendly states in the country for LLC formation. With no state income tax, a $150 filing fee for your Articles of Organization, and 5-7 business day processing, forming a South Dakota LLC is a straightforward process. The state requires an annual report costing $50, due during the anniversary month of your LLC’s formation. South Dakota’s combination of no income tax and relatively low filing costs makes it an attractive option for business owners.

Follow these steps to start your South Dakota LLC in 2026.

How to Start an LLC in South Dakota (6 Steps)

Step 1: Name Your South Dakota LLC

Your South Dakota LLC name must be distinguishable from any existing business entity on file with the South Dakota Secretary of State. The name must include a designator such as “Limited Liability Company,” “LLC,” or “L.L.C.” You can search for available names using the South Dakota Secretary of State business search.

If you find an available name but aren’t ready to file immediately, you can reserve it for 120 days by filing a Name Reservation with the Secretary of State for $25. Before finalizing your name, check whether the matching domain name and social media handles are available, and search the USPTO trademark database to avoid infringing on an existing trademark.

South Dakota naming rules:

• Must include “Limited Liability Company,” “LLC,” or “L.L.C.”
• Must be distinguishable from other business names on file with the South Dakota Secretary of State
• Cannot include words suggesting the LLC is a bank, insurance company, or government agency without proper authorization
• Cannot contain language implying a purpose the LLC is not authorized to pursue

Step 2: Choose a Registered Agent

South Dakota requires every LLC to have a registered agent with a physical street address in South Dakota. The registered agent receives legal documents — including lawsuits, subpoenas, and official state correspondence — on behalf of your LLC. This is a legal requirement, and your LLC cannot be formed without designating a registered agent.

You can serve as your own registered agent if you have a South Dakota address and are available during business hours, or you can hire a professional registered agent service. While acting as your own agent saves money, your personal address becomes public record and you must be available at that address during all normal business hours.

Our top recommendation is Northwest Registered Agent ($39/year), which also handles LLC formation for $39 + the $150 state fee. Using a professional service provides privacy, ensures you never miss an important document, and frees you from having to be physically present at a fixed address during business hours.

Step 3: File Your Articles of Organization

To officially create your South Dakota LLC, you need to file Articles of Organization with the South Dakota Secretary of State. The fastest way to file is online through the South Dakota Secretary of State’s website. You can also file by mail, but online filing is recommended for faster processing and confirmation.

When completing the form, you’ll provide your LLC’s name, registered agent information, principal office address, and management structure. You’ll choose between a member-managed and manager-managed structure. In a member-managed LLC, all owners participate in running the business. In a manager-managed LLC, designated managers handle daily operations while other members remain passive investors.

Filing details:

• Filing fee: $150
• Online filing: South Dakota Secretary of State (recommended)
• Processing time: 5-7 business days

Information required:

• LLC name
• Registered agent name and address
• Principal office address
• Management structure (member-managed or manager-managed)
• Organizer name and address
• Duration of the LLC (typically perpetual)

Step 4: Create an Operating Agreement

South Dakota does not legally require an operating agreement, but having one is strongly recommended for every LLC. An operating agreement is an internal document that establishes how your LLC is run, including ownership percentages, profit and loss distribution, voting rights, and procedures for adding or removing members or dissolving the company.

Without an operating agreement, your LLC will be governed by the default rules in South Dakota’s LLC statutes, which may not align with your intentions. For example, default rules typically assume profits are split equally regardless of capital contributions. An operating agreement lets you customize these terms. Most banks also require a copy of your operating agreement before opening a business bank account.

Step 5: Get an EIN

Apply for an Employer Identification Number (EIN) through the IRS website. It’s free and takes about 15 minutes online. An EIN is a nine-digit number assigned by the IRS that serves as your LLC’s tax identification number. You need an EIN to open a business bank account, hire employees, file federal taxes, and apply for business permits. Even single-member LLCs with no employees should get an EIN to keep their personal Social Security Number off business documents.

Step 6: File Your South Dakota Annual Report

All South Dakota LLCs must file an annual report with the Secretary of State. The report is due during the anniversary month of your LLC’s formation and costs $50 to file. You can file your annual report online through the South Dakota Secretary of State’s website. The annual report updates the state on your LLC’s current registered agent, principal office address, and member or manager information.

Failure to file your annual report can result in administrative dissolution of your LLC. If your LLC is dissolved for noncompliance, you can apply for reinstatement by filing the overdue reports and paying any outstanding fees. Set a reminder for the month your LLC was formed to ensure you file on time each year.

South Dakota LLC Costs

Total first-year cost: $200-$500. This range covers the required state filing fee ($150) plus the annual report ($50) and an optional registered agent service. If you serve as your own registered agent, your only mandatory costs are the $150 filing fee and $50 annual report. See our complete guide to LLC costs by state.

South Dakota LLC Taxes

One of the biggest advantages of forming an LLC in South Dakota is that the state has no personal income tax. This means LLC profits passed through to members are not subject to any state income tax — a significant savings compared to states with high income tax rates like California or New York. South Dakota is one of only a handful of states that impose no income tax on individuals.

South Dakota also has no corporate income tax, making it attractive for LLCs that elect to be taxed as corporations. The state does impose a sales tax of 4.5%, with local jurisdictions adding up to 2% for a combined maximum rate of around 6.5%. If your LLC sells taxable goods or services, you’ll need to register for a sales tax license and collect and remit sales tax.

At the federal level, all LLC members owe federal income tax and self-employment tax (15.3%) on their share of LLC profits. While South Dakota’s lack of state income tax is a major advantage, federal tax obligations still apply regardless of which state you form your LLC in.

South Dakota LLC Annual Requirements

Every South Dakota LLC must file an annual report with the Secretary of State during the anniversary month of the LLC’s formation. The filing fee is $50. You can submit the report online through the Secretary of State’s website. The report updates the state on your LLC’s registered agent, principal office address, and the names of members or managers. Failure to file can result in administrative dissolution.

In addition to the annual report, you must maintain a current registered agent in South Dakota at all times. If your registered agent changes, file an updated statement with the Secretary of State. Keep your operating agreement, financial records, and meeting minutes up to date. If your LLC’s name, address, or management structure changes, file the appropriate amendments with the state.

If your LLC collects sales tax, you must also file regular sales tax returns with the South Dakota Department of Revenue. The frequency of filing (monthly, quarterly, or annually) depends on your sales volume.

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Frequently Asked Questions

How much does it cost to start an LLC in South Dakota?

The state filing fee for a South Dakota LLC is $150, which is the cost to file your Articles of Organization with the Secretary of State. Additional costs may include a registered agent service ($39-$299/year), the annual report ($50), and a name reservation ($25, optional). Most people spend between $200 and $500 in their first year.

How long does it take to form an LLC in South Dakota?

Standard processing for South Dakota LLC filings takes 5-7 business days when filed online through the Secretary of State’s website. Filing by mail takes longer. Online filing is recommended for the fastest processing.

Does South Dakota have an income tax?

No, South Dakota has no state personal income tax and no state corporate income tax. This means LLC profits passed through to members are not taxed at the state level. Members still owe federal income tax and self-employment tax (15.3%) on their share of profits.

Do I need a registered agent in South Dakota?

Yes, every South Dakota LLC is required by law to have a registered agent with a physical street address in South Dakota. The registered agent accepts legal documents and official state correspondence on behalf of your LLC during normal business hours. A P.O. box cannot be used as a registered agent address.

Does South Dakota require an operating agreement?

No, South Dakota does not legally require an operating agreement. However, creating one is strongly recommended because it defines member roles, profit sharing, voting procedures, and decision-making processes. Without one, your LLC is governed by South Dakota’s default LLC statutes. Most banks also require an operating agreement to open a business bank account.

When is the South Dakota LLC annual report due?

The South Dakota LLC annual report is due during the anniversary month of your LLC’s formation. The filing fee is $50. You can file online through the Secretary of State’s website. Failure to file can result in administrative dissolution of your LLC.

Can I be my own registered agent in South Dakota?

Yes, you can serve as your own registered agent in South Dakota as long as you have a physical street address in the state and are available during normal business hours to accept legal documents. Your address becomes public record, and many LLC owners prefer a professional registered agent service for privacy and convenience.

Can a non-resident form an LLC in South Dakota?

Yes, you do not need to be a South Dakota resident or a U.S. citizen to form an LLC in South Dakota. You will need a registered agent with a physical address in South Dakota. Many non-residents use a professional registered agent service. If you conduct business in another state, you may also need to register your South Dakota LLC as a foreign LLC there.

Does South Dakota have a sales tax?

Yes, South Dakota has a state sales tax rate of 4.5%, with local jurisdictions adding up to an additional 2%. If your LLC sells taxable goods or services, you’ll need to register for a sales tax license with the South Dakota Department of Revenue and collect and remit sales tax. Some items, such as certain food products, may be subject to reduced rates.