How to Start an LLC in South Dakota (Step-by-Step Guide)

Forming an LLC in South Dakota requires filing Articles of Organization with the South Dakota Secretary of State and paying a $150 filing fee. Online filings are typically processed within 1-2 business days.

South Dakota is one of the most business-friendly states in the country — there’s no personal income tax, no corporate income tax, and no business inventory tax. 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 LLC name must be distinguishable from other business names registered in South Dakota. The name must include “Limited Liability Company,” “LLC,” or “L.L.C.”

Search the South Dakota Secretary of State business name database to check availability. You can reserve a name for 120 days by filing an Application for Reservation of Name ($25 fee).

South Dakota naming rules:

• Must be distinguishable from any existing business entity registered in South Dakota
• Cannot include words that imply the LLC is a bank, insurance company, or government agency without proper authorization
• Must contain an LLC designator (“Limited Liability Company,” “LLC,” or “L.L.C.”)
• Cannot contain language stating or implying the LLC is organized for a purpose other than what is permitted by state law

Step 2: Choose a Registered Agent

South Dakota requires every LLC to have a registered agent with a physical street address in South Dakota. PO Boxes are not allowed. The registered agent receives legal documents, service of process, and official state correspondence on behalf of your LLC.

You can serve as your own registered agent (if you have a South Dakota address), or hire a professional service. Our top recommendation is Northwest Registered Agent ($39/year), which also handles LLC formation for $39 + the $150 state fee.

Step 3: File Your Articles of Organization

File your Articles of Organization with the South Dakota Secretary of State. You can file online through the Secretary of State’s online portal or by mail.

Filing details:

• Filing fee: $150 (online), $165 (mail — includes $15 paper processing fee)
• Online filing: Secretary of State’s online portal (recommended — faster processing)
• Processing time: 1-2 business days (online), 5-7 business days (mail)
• Expedited processing: Available for an additional $50

Information required:

• LLC name
• Registered agent name and address
• Principal office address
• Organizer name and address
• Whether the LLC is member-managed or manager-managed
• LLC purpose (general or specific)
• Duration (perpetual or specific date)

Step 4: Create an Operating Agreement

South Dakota doesn’t legally require an operating agreement, but having one is strongly recommended. An operating agreement establishes ownership percentages, profit distribution, management responsibilities, and procedures for adding or removing members. Most banks require an operating agreement to open a business bank account.

Even single-member LLCs benefit from an operating agreement — it helps reinforce the legal separation between you and your business, which strengthens your personal liability protection.

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. You need an EIN to open a business bank account, hire employees, and file federal taxes.

Single-member LLCs with no employees can technically use the owner’s Social Security Number instead, but getting an EIN is still recommended to keep your personal and business finances separate.

Step 6: File Your Annual Report

After forming your LLC, you’ll need to file an annual report each year with the South Dakota Secretary of State. The annual report keeps your business information current with the state and is required to maintain good standing.

Annual report details:

• Due date: First day of the anniversary month of your LLC’s formation
• Filing fee: $55 (online), $70 (mail)
• Where to file: South Dakota Secretary of State’s online portal

For example, if you formed your LLC on March 15, your annual report is due each year on March 1.

South Dakota LLC Costs

Total first-year cost: $150-$449 (depending on whether you use a registered agent service). See our complete guide to LLC costs by state.

South Dakota LLC Taxes

South Dakota is one of the most tax-friendly states in the country for LLC owners. There is no personal income tax and no corporate income tax.

• State income tax: None — South Dakota has no personal or corporate income tax
• Franchise tax: None
• Sales tax: 4.2% state rate, plus up to 2% in local taxes (combined rates range from 4.5% to 6.5% depending on location)
• Federal taxes: Standard pass-through taxation — profits pass to members’ personal federal returns

Because South Dakota has no state income tax, LLC members only pay federal self-employment tax (15.3%) and federal income tax on their share of LLC profits.

Annual Requirements for South Dakota LLCs

• Annual report: Due on the first day of the anniversary month of your LLC’s formation. Filing fee is $55 (online) or $70 (mail). Late filing or failure to file may result in administrative dissolution.
• Maintain a registered agent: Must have a registered agent with a physical South Dakota address at all times.
• Sales tax filing: If your LLC sells taxable products or services, you must collect and remit sales tax. Filing frequency is assigned by the Department of Revenue based on your sales volume.

Frequently Asked Questions

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

Online filings are typically processed within 1-2 business days. Mail filings take 5-7 business days. You can pay an additional $50 for expedited processing.

Does South Dakota have a state income tax?

No. South Dakota is one of a handful of states with no personal income tax and no corporate income tax. LLC members only owe federal taxes on their share of LLC profits.

Can I form a South Dakota LLC if I live in another state?

Yes. You can form a South Dakota LLC regardless of where you live. You will need a registered agent with a physical address in South Dakota. However, if you primarily do business in another state, you may need to register your LLC as a foreign LLC in that state as well. See our how to start an LLC guide for more on choosing the right state.

Does South Dakota require an operating agreement?

No, South Dakota does not legally require an operating agreement. However, we strongly recommend creating one to establish clear ownership and management rules, protect your personal liability, and satisfy bank requirements for opening a business account.

What is the South Dakota annual report fee?

The annual report filing fee is $55 if filed online or $70 if filed by mail. It is due on the first day of the anniversary month of your LLC’s formation each year.

Start an LLC in Another State

Click your state below for a step-by-step formation guide with filing fees, requirements, and timelines.